jdbc.url=jdbc:mysql://192.168.208.192:3306/test?characterEncoding=utf-8 jdbc.driver=com.mysql.jdbc.Driver jdbc.username=root jdbc.password=root
log4j.rootLogger = debug,stdout,E ### 輸出信息到控制擡 ### log4j.appender.stdout = org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target = System.out log4j.appender.stdout.layout = org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n ### 輸出DEBUG 級別以上的日誌到=E://logs/error.log ### log4j.appender.D = org.apache.log4j.DailyRollingFileAppender log4j.appender.D.File = E://logs/log.log log4j.appender.D.Append = true log4j.appender.D.Threshold = DEBUG log4j.appender.D.layout = org.apache.log4j.PatternLayout log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n ### 輸出ERROR 級別以上的日誌到=E://logs/error.log ### log4j.appender.E = org.apache.log4j.DailyRollingFileAppender log4j.appender.E.File =E://logs/error.log log4j.appender.E.Append = true log4j.appender.E.Threshold = ERROR log4j.appender.E.layout = org.apache.log4j.PatternLayout log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <!-- 加載屬性文件 先加載內部標籤,再加載外部文件,名稱一致時,會覆蓋內部標籤內容 --> <properties resource="jdbc.properties"/> <!--別名掃描--> <typeAliases> <package name="com.zze.mybatis.pojo" /> </typeAliases> <!-- 和 spring 整合後 environments配置將廢除--> <environments default="development"> <environment id="development"> <!-- 使用jdbc事務管理--> <transactionManager type="JDBC"/> <!-- 數據庫鏈接池--> <dataSource type="POOLED"> <property name="driver" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> </dataSource> </environment> </environments> <!-- 加載映射文件 --> <mappers> <package name="com.zze.mybatis.mapper"/> </mappers> </configuration>
package com.zze.mybatis.pojo; import java.util.Date; public class User { private Integer id; private String name; private Date birthday; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } @Override public String toString() { return "User{" + "id=" + id + ", name='" + name + '\'' + ", birthday=" + birthday + '}'; } }
package com.zze.mybatis.util; import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; import java.io.IOException; import java.io.InputStream; public class SqlSessionFactoryUtil { private static SqlSessionFactory sqlSessionFactory; static { // 建立 SqlSessionFactoryBuilder 對象 SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder(); // 建立核心配置文件的輸入流 InputStream resourceAsStream = null; try { resourceAsStream = Resources.getResourceAsStream("mybatis/SqlMapConfig.xml"); } catch (IOException e) { e.printStackTrace(); } // 建立 Session 工廠 sqlSessionFactory = sqlSessionFactoryBuilder.build(resourceAsStream); } /** * 打開一個 Session * * @return SqlSession 實例 */ public static SqlSession openSession() { return sqlSessionFactory.openSession(); } /** * 打開一個 Session * * @param autoCommit 是否自動提交事務 * @return SqlSession 實例 */ public static SqlSession openSession(Boolean autoCommit) { return sqlSessionFactory.openSession(autoCommit); } }
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.zze.mybatis</groupId> <artifactId>mybatis_test2</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.7.25</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.7.25</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.2.8</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>2.0-rc1</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>2.0-rc1</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> <dependency> <groupId>javassist</groupId> <artifactId>javassist</artifactId> <version>3.11.0.GA</version> </dependency> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>1.1.1</version> </dependency> <dependency> <groupId>cglib</groupId> <artifactId>cglib</artifactId> <version>2.2.2</version> </dependency> <dependency> <groupId>asm</groupId> <artifactId>asm</artifactId> <version>3.3.1</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.37</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.6.1</version> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins> </build> </project>
package com.zze.mybatis.pojo; public class QueryVO { private User user; public User getUser() { return user; } public void setUser(User user) { this.user = user; } }
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.zze.mybatis.mapper.UserMapper"> <select id="getByQueryVO" parameterType="queryvo" resultType="user"> select id,name,birthday from user where name like '%${user.name}%' </select> </mapper>
package com.zze.mybatis.mapper; import com.zze.mybatis.pojo.QueryVO; import com.zze.mybatis.pojo.User; public interface UserMapper { User getByQueryVO(QueryVO queryVO); }
@Test public void test() { SqlSession sqlSession = SqlSessionFactoryUtil.openSession(); UserMapper mapper = sqlSession.getMapper(UserMapper.class); QueryVO queryVO = new QueryVO(); User user = new User(); user.setName("張"); queryVO.setUser(user); User user1 = mapper.getByQueryVO(queryVO); System.out.println(user1); /* ==> Preparing: select name,age,birthday,uuid from user where name like '%張%' */ }
若是表字段名與 pojo 屬性名不一致,則可經過 resultMap 標籤配置表字段與 pojo 屬性的映射關係:java
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.zze.mybatis.mapper.UserMapper"> <resultMap id="userMap" type="user"> <!-- id 配置對應主鍵字段 property:屬性名 column:字段名 --> <id property="id" column="uid"/> <!-- result 配置普通屬性字段 property:屬性名 column:字段名 --> <result property="name" column="username"/> <!-- 非關聯查詢時 屬性名與字段名相同的 result 映射能夠省略不寫 --> <!--<result property="birthday" column="birthday"/>--> </resultMap> <select id="getAll" resultMap="userMap"> select id uid,name username,birthday from user; </select> </mapper>
package com.zze.mybatis.mapper; import com.zze.mybatis.pojo.User; import java.util.List; public interface UserMapper { List<User> getAll(); }
package com.zze.mybatis.test; import com.zze.mybatis.mapper.UserMapper; import com.zze.mybatis.pojo.User; import com.zze.mybatis.util.SqlSessionFactoryUtil; import org.apache.ibatis.session.SqlSession; import org.junit.Before; import org.junit.Test; import java.util.List; public class MyBatisTest { private UserMapper userMapper; @Before public void init() { SqlSession sqlSession = SqlSessionFactoryUtil.openSession(); userMapper = sqlSession.getMapper(UserMapper.class); } @Test public void test() { List<User> all = userMapper.getAll(); for (User user : all) { System.out.println(user); } /* ==> Preparing: select id uid,name username,birthday from user; */ } }
當 sql 條件須要動態拼接時,可使用 where 和 if 標籤:mysql
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.zze.mybatis.mapper.UserMapper"> <select id="getByUser" resultType="user" parameterType="user"> select id,name,birthday from user <where> <if test="name!=null and name!=''"> name like '%${name}%' </if> </where> </select> </mapper>
package com.zze.mybatis.mapper; import com.zze.mybatis.pojo.User; import java.util.List; public interface UserMapper { List<User> getByUser(User user); }
package com.zze.mybatis.test; import com.zze.mybatis.mapper.UserMapper; import com.zze.mybatis.pojo.User; import com.zze.mybatis.util.SqlSessionFactoryUtil; import org.apache.ibatis.session.SqlSession; import org.junit.Before; import org.junit.Test; import java.util.List; public class MyBatisTest { private UserMapper userMapper; @Before public void init() { SqlSession sqlSession = SqlSessionFactoryUtil.openSession(); userMapper = sqlSession.getMapper(UserMapper.class); } @Test public void test() { User user = new User(); user.setName("張"); List<User> userList1 = userMapper.getByUser(user); userList1.forEach(u-> System.out.println(u)); /* ==> Preparing: select id,name,birthday from user WHERE name like '%張%' */ user.setName(null); List<User> userList2 = userMapper.getByUser(user); userList2.forEach(u-> System.out.println(u)); /* ==> Preparing: select id,name,birthday from user */ } }
當一段 sql 要被頻繁在多處使用時,能夠將這段 sql 單獨抽取出來:spring
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.zze.mybatis.mapper.UserMapper"> <sql id="userAllField"> id,name,birthday </sql> <select id="getAll" resultType="user"> select <include refid="userAllField"/> from user </select> </mapper>
package com.zze.mybatis.mapper; import com.zze.mybatis.pojo.User; import java.util.List; public interface UserMapper { List<User> getAll(); }
package com.zze.mybatis.test; import com.zze.mybatis.mapper.UserMapper; import com.zze.mybatis.pojo.User; import com.zze.mybatis.util.SqlSessionFactoryUtil; import org.apache.ibatis.session.SqlSession; import org.junit.Before; import org.junit.Test; import java.util.List; public class MyBatisTest { private UserMapper userMapper; @Before public void init() { SqlSession sqlSession = SqlSessionFactoryUtil.openSession(); userMapper = sqlSession.getMapper(UserMapper.class); } @Test public void test() { List<User> userList = userMapper.getAll(); userList.forEach(u-> System.out.println(u)); /* ==> Preparing: select id,name,birthday from user */ } }
編寫 sql 時也能夠經過傳入集合來動態拼裝條件:sql
package com.zze.mybatis.pojo; import java.util.List; public class QueryVO { private List<Integer> idList; public List<Integer> getIdList() { return idList; } public void setIdList(List<Integer> idList) { this.idList = idList; } }
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.zze.mybatis.mapper.UserMapper"> <select id="getByIdList" resultType="user" parameterType="queryvo"> select * from user <where> <foreach collection="idList" open="id in (" close=")" separator="," item="id"> #{id} </foreach> </where> </select> </mapper>
package com.zze.mybatis.mapper; import com.zze.mybatis.pojo.QueryVO; import com.zze.mybatis.pojo.User; import java.util.List; public interface UserMapper { List<User> getByIdList(QueryVO queryVO); }
package com.zze.mybatis.test; import com.zze.mybatis.mapper.UserMapper; import com.zze.mybatis.pojo.QueryVO; import com.zze.mybatis.pojo.User; import com.zze.mybatis.util.SqlSessionFactoryUtil; import org.apache.ibatis.session.SqlSession; import org.junit.Before; import org.junit.Test; import java.util.Arrays; import java.util.List; public class MyBatisTest { private UserMapper userMapper; @Before public void init() { SqlSession sqlSession = SqlSessionFactoryUtil.openSession(); userMapper = sqlSession.getMapper(UserMapper.class); } @Test public void test() { QueryVO queryVO = new QueryVO(); queryVO.setIdList(Arrays.asList(1, 2, 3)); List<User> userList = userMapper.getByIdList(queryVO); userList.forEach(u-> System.out.println(u)); /* ==> Preparing: select * from user WHERE id in ( ? , ? , ? ) ==> Parameters: 1(Integer), 2(Integer), 3(Integer) */ } }
要注意的是 mybatis 不支持直接傳入集合,但咱們能夠如上示例將它放在包裝類中傳入。數據庫
新建與用戶關聯的訂單表和 pojo,配置映射文件:apache
package com.zze.mybatis.pojo; import java.util.Date; public class Order { private Integer id; private Integer uId; private Double totalPrice; private Date createDate; /* Order 一對一關聯 User */ private User user; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public Integer getuId() { return uId; } public void setuId(Integer uId) { this.uId = uId; } public Double getTotalPrice() { return totalPrice; } public void setTotalPrice(Double totalPrice) { this.totalPrice = totalPrice; } public Date getCreateDate() { return createDate; } public void setCreateDate(Date createDate) { this.createDate = createDate; } public User getUser() { return user; } public void setUser(User user) { this.user = user; } @Override public String toString() { return "Order{" + "id=" + id + ", uId=" + uId + ", TotalPrice=" + totalPrice + ", createDate=" + createDate + ", user=" + user + '}'; } }
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.zze.mybatis.mapper.OrderMapper"> <resultMap id="orderMap" type="order"> <!-- 注意: 在關聯查詢時,每一個映射字段都需配置,不可省略。 --> <id property="id" column="oid"/> <result property="uId" column="uid"/> <result property="totalPrice" column="totalPrice"/> <result property="createDate" column="createdate"/> <!-- 經過 association 配置一對一關係 --> <association property="user" javaType="user"> <id property="id" column="uid"/> <result property="name" column="name"/> <result property="birthday" column="birthday"/> </association> </resultMap> <select id="getAll" resultMap="orderMap"> select o1.id oid,o1.uid,totalPrice,createdate,name,birthday from `order` o1 left join `user` u1 on o1.uid = u1.id; </select> </mapper>
package com.zze.mybatis.test; import com.zze.mybatis.mapper.OrderMapper; import com.zze.mybatis.pojo.Order; import com.zze.mybatis.util.SqlSessionFactoryUtil; import org.apache.ibatis.session.SqlSession; import org.junit.Before; import org.junit.Test; import java.util.List; public class OrderTest { private OrderMapper orderMapper; @Before public void init() { SqlSession sqlSession = SqlSessionFactoryUtil.openSession(); orderMapper = sqlSession.getMapper(OrderMapper.class); } @Test public void test() { List<Order> orderList = orderMapper.getAll(); orderList.forEach(o -> System.out.println(o)); /* ==> Preparing: select o1.id oid,o1.uid,totalPrice,createdate,name,birthday from `order` o1 left join `user` u1 on o1.uid = u1.id; Order{id=1, uId=1, TotalPrice=324.0, createDate=Thu Mar 21 11:10:20 CST 2019, user=User{id=1, name='張三', birthday=Thu Jan 01 00:00:00 CST 1998}} Order{id=3, uId=1, TotalPrice=543.0, createDate=Mon Mar 18 11:11:05 CST 2019, user=User{id=1, name='張三', birthday=Thu Jan 01 00:00:00 CST 1998}} Order{id=2, uId=3, TotalPrice=23.0, createDate=Fri Mar 01 06:04:07 CST 2019, user=User{id=3, name='李四', birthday=Thu Jan 01 00:00:00 CST 1998}} */ } }
修改用戶的 pojo 關聯訂單,配置映射文件:api
package com.zze.mybatis.pojo; import java.util.Date; import java.util.List; public class User { private Integer id; private String name; private Date birthday; /* User 一對多關聯 Order */ private List<Order> orders; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } public List<Order> getOrders() { return orders; } public void setOrders(List<Order> orders) { this.orders = orders; } @Override public String toString() { return "User{" + "id=" + id + ", name='" + name + '\'' + ", birthday=" + birthday + '}'; } }
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.zze.mybatis.mapper.UserMapper"> <resultMap id="userMap" type="user"> <id property="id" column="uId"/> <result property="name" column="name"/> <result property="birthday" column="birthday"/> <!-- 使用 collection 標籤創建一對多關係 注意,這裏使用的是 ofType,而一對一關聯時使用的是 javaType --> <collection property="orders" ofType="order"> <id property="id" column="oId"/> <result property="totalPrice" column="totalPrice"/> <result property="createDate" column="createDate"/> <result property="uId" column="uId"/> </collection> </resultMap> <select id="getAll" resultMap="userMap"> select u1.id uId,o1.id oId,totalPrice,createdate,name,birthday from `user` u1 left join `order` o1 on u1.id=o1.uid; </select> </mapper>
一、建立一個 maven java 工程,引入相關依賴:session
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.zze.mybatis</groupId> <artifactId>mybatis_spring</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <!--spring --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>4.3.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.3.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>4.3.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>4.3.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>4.3.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.3.2.RELEASE</version> </dependency> <!--mybatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.2.8</version> </dependency> <!--mybatis 整合 spring--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.0</version> </dependency> <!--mysql 驅動--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.38</version> </dependency> <!--阿里巴巴數據源--> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.0.18</version> </dependency> <!--junit--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> <!--日誌--> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.7.25</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.7.25</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>2.0-rc1</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>2.0-rc1</version> </dependency> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>1.1.1</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.6.1</version> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins> </build> </project>
二、引入 mybatis 核心配置文件:mybatis
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> </configuration>
三、引入 jdbc 鏈接信息屬性文件:app
jdbc.url=jdbc:mysql://192.168.208.192:3306/test?characterEncoding=utf-8 jdbc.driver=com.mysql.jdbc.Driver jdbc.username=root jdbc.password=root
四、引入 log4j 屬性文件:
log4j.rootLogger = debug,stdout,E ### 輸出信息到控制擡 ### log4j.appender.stdout = org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target = System.out log4j.appender.stdout.layout = org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n ### 輸出DEBUG 級別以上的日誌到=E://logs/error.log ### log4j.appender.D = org.apache.log4j.DailyRollingFileAppender log4j.appender.D.File = E://logs/log.log log4j.appender.D.Append = true log4j.appender.D.Threshold = DEBUG log4j.appender.D.layout = org.apache.log4j.PatternLayout log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n ### 輸出ERROR 級別以上的日誌到=E://logs/error.log ### log4j.appender.E = org.apache.log4j.DailyRollingFileAppender log4j.appender.E.File =E://logs/error.log log4j.appender.E.Append = true log4j.appender.E.Threshold = ERROR log4j.appender.E.layout = org.apache.log4j.PatternLayout log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n
五、引入 spring 核心配置文件:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!--讀取屬性文件--> <context:property-placeholder location="classpath:config/jdbc.properties"/> <!--鏈接池--> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <!-- 基本屬性 url、user、password --> <property name="driverClassName" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> <!-- 配置初始化大小、最小、最大 --> <property name="maxActive" value="20"/> <property name="initialSize" value="1"/> <property name="minIdle" value="1"/> <!-- 配置獲取鏈接等待超時的時間 --> <property name="maxWait" value="60000"/> <!-- 配置間隔多久才進行一次檢測,檢測須要關閉的空閒鏈接,單位是毫秒 --> <property name="timeBetweenEvictionRunsMillis" value="60000"/> <!-- 配置一個鏈接在池中最小生存的時間,單位是毫秒 --> <property name="minEvictableIdleTimeMillis" value="300000"/> </bean> <!--配置 SqlSessionFactory--> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!--配置數據源--> <property name="dataSource" ref="dataSource"/> <!--配置核心配置文件路徑--> <property name="configLocation" value="classpath:config/SqlMapConfig.xml"/> <!--配置別名掃描包--> <property name="typeAliasesPackage" value="com.zze.mybatis.pojo"/> </bean> </beans>
六、建立測試用 pojo 及其映射文件:
package com.zze.mybatis.pojo; import java.util.Date; public class User { private Integer id; private String name; private String gender; private Date birthday; private String address; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getGender() { return gender; } public void setGender(String gender) { this.gender = gender; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } @Override public String toString() { return "User{" + "id=" + id + ", name='" + name + '\'' + ", gender='" + gender + '\'' + ", birthday=" + birthday + ", address='" + address + '\'' + '}'; } }
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <mappers> <mapper resource="config/mapper/UserMapper.xml"/> </mappers> </configuration>
七、建立 dao 接口:
package com.zze.mybatis.dao; import com.zze.mybatis.pojo.User; import java.util.List; public interface UserDao { List<User> getAll(); }
一、在 mybatis 核心配置文件中引入映射文件:
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <mappers> <mapper resource="config/mapper/UserMapper.xml"/> </mappers> </configuration>
二、編寫 dao 接口實現類:
package com.zze.mybatis.dao.impl; import com.zze.mybatis.dao.UserDao; import com.zze.mybatis.pojo.User; import org.apache.ibatis.session.SqlSession; import org.mybatis.spring.support.SqlSessionDaoSupport; import java.util.List; public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao { @Override public List<User> getAll() { SqlSession sqlSession = super.getSqlSession(); List<User> userList = sqlSession.selectList("user.getAll"); // 注意,這裏 SqlSession 的實例的建立與銷燬已經交給 Spring 管理,不用手動關閉,不然會異常 return userList; } }
三、修改 Spring 配置:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!--讀取屬性文件--> <context:property-placeholder location="classpath:config/jdbc.properties"/> <!--鏈接池--> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <!-- 基本屬性 url、user、password --> <property name="driverClassName" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> <!-- 配置初始化大小、最小、最大 --> <property name="maxActive" value="20"/> <property name="initialSize" value="1"/> <property name="minIdle" value="1"/> <!-- 配置獲取鏈接等待超時的時間 --> <property name="maxWait" value="60000"/> <!-- 配置間隔多久才進行一次檢測,檢測須要關閉的空閒鏈接,單位是毫秒 --> <property name="timeBetweenEvictionRunsMillis" value="60000"/> <!-- 配置一個鏈接在池中最小生存的時間,單位是毫秒 --> <property name="minEvictableIdleTimeMillis" value="300000"/> </bean> <!--配置 SqlSessionFactory--> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!--配置數據源--> <property name="dataSource" ref="dataSource"/> <!--配置核心配置文件路徑--> <property name="configLocation" value="classpath:config/SqlMapConfig.xml"/> <!--配置別名掃描包--> <property name="typeAliasesPackage" value="com.zze.mybatis.pojo"/> </bean> <bean id="userDao" class="com.zze.mybatis.dao.impl.UserDaoImpl"> <property name="sqlSessionFactory" ref="sqlSessionFactory"/> </bean> </beans>
四、測試:
package com.zze.mybatis.test; import com.zze.mybatis.dao.UserDao; import com.zze.mybatis.pojo.User; import org.junit.Before; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import java.util.List; public class UserDaoTest { private ApplicationContext applicationContext; @Before public void init(){ applicationContext = new ClassPathXmlApplicationContext("classpath:config/applicationContext.xml"); } @Test public void test(){ UserDao userDao = applicationContext.getBean(UserDao.class); List<User> userList = userDao.getAll(); userList.forEach(u-> System.out.println(u)); /* ==> Preparing: select id,name,gender,birthday,address from user; */ } }
一、修改 UserDao 爲 UserMapper:
package com.zze.mybatis.mapper; import com.zze.mybatis.pojo.User; import java.util.List; public interface UserMapper { List<User> getAll(); }
二、將映射文件放入 mapper 同一目錄,並指定 namespace 爲 mapper 類全路徑:
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.zze.mybatis.mapper.UserMapper"> <select id="getAll" resultType="user"> select id,name,gender,birthday,address from user; </select> </mapper>
三、修改 Spring 配置:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!--讀取屬性文件--> <context:property-placeholder location="classpath:config/jdbc.properties"/> <!--鏈接池--> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <!-- 基本屬性 url、user、password --> <property name="driverClassName" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> <!-- 配置初始化大小、最小、最大 --> <property name="maxActive" value="20"/> <property name="initialSize" value="1"/> <property name="minIdle" value="1"/> <!-- 配置獲取鏈接等待超時的時間 --> <property name="maxWait" value="60000"/> <!-- 配置間隔多久才進行一次檢測,檢測須要關閉的空閒鏈接,單位是毫秒 --> <property name="timeBetweenEvictionRunsMillis" value="60000"/> <!-- 配置一個鏈接在池中最小生存的時間,單位是毫秒 --> <property name="minEvictableIdleTimeMillis" value="300000"/> </bean> <!--配置 SqlSessionFactory--> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!--配置數據源--> <property name="dataSource" ref="dataSource"/> <!--配置核心配置文件路徑--> <property name="configLocation" value="classpath:config/SqlMapConfig.xml"/> <!--配置別名掃描包--> <property name="typeAliasesPackage" value="com.zze.mybatis.pojo"/> </bean> <!--動態代理配置方式一:配置單個接口--> <!-- <bean id="baseMapper" class="org.mybatis.spring.mapper.MapperFactoryBean" abstract="true" lazy-init="true"> <property name="sqlSessionFactory" ref="sqlSessionFactory"/> </bean> <bean parent="baseMapper"> <property name="mapperInterface" value="com.zze.mybatis.mapper.UserMapper"/> </bean> --> <!--動態代理配置方式二:配置 mapper 包掃描--> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.zze.mybatis.mapper"/> </bean> </beans>
四、測試:
package com.zze.mybatis.test; import com.zze.mybatis.dao.UserDao; import com.zze.mybatis.mapper.UserMapper; import com.zze.mybatis.pojo.User; import org.junit.Before; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import java.util.List; public class UserMapperTest { private ApplicationContext applicationContext; @Before public void init(){ applicationContext = new ClassPathXmlApplicationContext("classpath:config/applicationContext.xml"); } @Test public void test(){ UserMapper userMapper = applicationContext.getBean(UserMapper.class); List<User> userList = userMapper.getAll(); userList.forEach(u-> System.out.println(u)); /* ==> Preparing: select id,name,gender,birthday,address from user; */ } }
一、建立 maven java 工程,引入以下依賴:
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.zze</groupId> <artifactId>mybaits_generator</artifactId> <version>Lasted</version> <build> <plugins> <plugin> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-maven-plugin</artifactId> <version>1.3.6</version> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.6.1</version> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins> </build> <dependencies> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.2.3</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.46</version> </dependency> <dependency> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-core</artifactId> <version>1.3.7</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>2.0-rc1</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>1.1.1</version> </dependency> </dependencies> </project>
二、引入逆向生成配置文件:
<?xml version='1.0' encoding='UTF-8'?> <!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd"> <generatorConfiguration> <!-- 能夠用於加載配置項或者配置文件,在整個配置文件中就可使用${propertyKey}的方式來引用配置項 resource:配置資源加載地址,使用resource,MBG從classpath開始找,好比com/myproject/generatorConfig.properties url:配置資源加載地質,使用URL的方式,好比file:///C:/myfolder/generatorConfig.properties. 注意,兩個屬性只能選址一個; 另外,若是使用了mybatis-generator-maven-plugin,那麼在pom.xml中定義的properties均可以直接在generatorConfig.xml中使用 <properties resource="" url="" /> --> <!-- 在MBG工做的時候,須要額外加載的依賴包 location屬性指明加載jar/zip包的全路徑 <classPathEntry location="/Program Files/IBM/SQLLIB/java/db2java.zip" /> --> <!-- context:生成一組對象的環境 id:必選,上下文id,用於在生成錯誤時提示 defaultModelType:指定生成對象的樣式 1,conditional:相似hierarchical; 2,flat:全部內容(主鍵,blob)等所有生成在一個對象中; 3,hierarchical:主鍵生成一個XXKey對象(key class),Blob等單獨生成一個對象,其餘簡單屬性在一個對象中(record class) targetRuntime: 1,MyBatis3:默認的值,生成基於MyBatis3.x以上版本的內容,包括XXXBySample; 2,MyBatis3Simple:相似MyBatis3,只是不生成XXXBySample; introspectedColumnImpl:類全限定名,用於擴展MBG --> <context id="mybatisGenerator"> <!-- 自動識別數據庫關鍵字,默認false,若是設置爲true,根據SqlReservedWords中定義的關鍵字列表; 通常保留默認值,遇到數據庫關鍵字(Java關鍵字),使用columnOverride覆蓋 --> <property name="autoDelimitKeywords" value="false"/> <!-- 生成的Java文件的編碼 --> <property name="javaFileEncoding" value="UTF-8"/> <!-- 格式化java代碼 --> <property name="javaFormatter" value="org.mybatis.generator.api.dom.DefaultJavaFormatter"/> <!-- 格式化XML代碼 --> <property name="xmlFormatter" value="org.mybatis.generator.api.dom.DefaultXmlFormatter"/> <!-- beginningDelimiter和endingDelimiter:指明數據庫的用於標記數據庫對象名的符號,好比ORACLE就是雙引號,MYSQL默認是`反引號; --> <property name="beginningDelimiter" value="`"/> <property name="endingDelimiter" value="`"/> <commentGenerator> <!-- 是否去除自動生成的註釋 true:是 : false:否 --> <property name="suppressAllComments" value="true"/> </commentGenerator> <!--數據庫鏈接的信息:驅動類、鏈接地址、用戶名、密碼 --> <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/test? serverTimezone=CTT&useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true" userId="root" password="root"> </jdbcConnection> <!-- java類型處理器 用於處理DB中的類型到Java中的類型,默認使用JavaTypeResolverDefaultImpl; 注意一點,默認會先嚐試使用Integer,Long,Short等來對應DECIMAL和 NUMERIC數據類型; --> <javaTypeResolver type="org.mybatis.generator.internal.types.JavaTypeResolverDefaultImpl"> <!-- true:使用BigDecimal對應DECIMAL和 NUMERIC數據類型 false:默認, scale>0;length>18:使用BigDecimal; scale=0;length[10,18]:使用Long; scale=0;length[5,9]:使用Integer; scale=0;length<5:使用Short; --> <property name="forceBigDecimals" value="false"/> </javaTypeResolver> <!-- java模型建立器,是必需要的元素 負責:1,key類(見context的defaultModelType);2,java類;3,查詢類 targetPackage:生成的類要放的包,真實的包受enableSubPackages屬性控制; targetProject:目標項目,指定一個存在的目錄下,生成的內容會放到指定目錄中,若是目錄不存在,MBG不會自動建目錄 --> <javaModelGenerator targetPackage="com.zze.mybatis.pojo" targetProject="mybatis_spring/src/main/java"> <!-- for MyBatis3/MyBatis3Simple 自動爲每個生成的類建立一個構造方法,構造方法包含了全部的field;而不是使用setter; --> <property name="constructorBased" value="false"/> <!-- 在targetPackage的基礎上,根據數據庫的schema再生成一層package,最終生成的類放在這個package下,默認爲false --> <property name="enableSubPackages" value="true"/> <!-- for MyBatis3 / MyBatis3Simple 是否建立一個不可變的類,若是爲true, 那麼MBG會建立一個沒有setter方法的類,取而代之的是相似constructorBased的類 --> <property name="immutable" value="false"/> <!-- 設置一個根對象, 若是設置了這個根對象,那麼生成的keyClass或者recordClass會繼承這個類;在Table的rootClass屬性中能夠覆蓋該選項 注意:若是在key class或者record class中有root class相同的屬性,MBG就不會從新生成這些屬性了,包括: 1,屬性名相同,類型相同,有相同的getter/setter方法; --> <!-- <property name="rootClass" value="com.zze.mybatis.pojo.BaseDomain"/>--> <!-- 設置是否在getter方法中,對String類型字段調用trim()方法 --> <property name="trimStrings" value="true"/> </javaModelGenerator> <!-- 生成SQL map的XML文件生成器, 注意,在Mybatis3以後,咱們可使用mapper.xml文件+Mapper接口(或者不用mapper接口), 或者只使用Mapper接口+Annotation,因此,若是 javaClientGenerator配置中配置了須要生成XML的話,這個元素就必須配置 targetPackage/targetProject:同javaModelGenerator --> <sqlMapGenerator targetPackage="com.zze.mybatis.mapper" targetProject="mybatis_spring/src/main/resources"> <!-- 在targetPackage的基礎上,根據數據庫的schema再生成一層package,最終生成的類放在這個package下,默認爲false --> <property name="enableSubPackages" value="false"/> </sqlMapGenerator> <!-- 對於mybatis來講,即生成Mapper接口,注意,若是沒有配置該元素,那麼默認不會生成Mapper接口 targetPackage/targetProject:同javaModelGenerator type:選擇怎麼生成mapper接口(在MyBatis3/MyBatis3Simple下): 1,ANNOTATEDMAPPER:會生成使用Mapper接口+Annotation的方式建立(SQL生成在annotation中),不會生成對應的XML; 2,MIXEDMAPPER:使用混合配置,會生成Mapper接口,並適當添加合適的Annotation,可是XML會生成在XML中; 3,XMLMAPPER:會生成Mapper接口,接口徹底依賴XML; 注意,若是context是MyBatis3Simple:只支持ANNOTATEDMAPPER和XMLMAPPER --> <javaClientGenerator type="XMLMAPPER" targetPackage="com.zze.mybatis.mapper" targetProject="mybatis_spring/src/main/java"> <!-- 在targetPackage的基礎上,根據數據庫的schema再生成一層package,最終生成的類放在這個package下,默認爲false --> <property name="enableSubPackages" value="true"/> <!-- 能夠爲全部生成的接口添加一個父接口,可是MBG只負責生成,不負責檢查--> <!--<property name="rootInterface" value=""/>--> </javaClientGenerator> <!-- 選擇一個table來生成相關文件,能夠有一個或多個table,必需要有table元素 選擇的table會生成一下文件: 1,SQL map文件 2,生成一個主鍵類; 3,除了BLOB和主鍵的其餘字段的類; 4,包含BLOB的類; 5,一個用戶生成動態查詢的條件類(selectByExample, deleteByExample),可選; 6,Mapper接口(可選) tableName(必要):要生成對象的表名; 注意:大小寫敏感問題。正常狀況下,MBG會自動的去識別數據庫標識符的大小寫敏感度,在通常狀況下,MBG會 根據設置的schema,catalog或tablename去查詢數據表,按照下面的流程: 1,若是schema,catalog或tablename中有空格,那麼設置的是什麼格式,就精確的使用指定的大小寫格式去查詢; 2,不然,若是數據庫的標識符使用大寫的,那麼MBG自動把表名變成大寫再查找; 3,不然,若是數據庫的標識符使用小寫的,那麼MBG自動把表名變成小寫再查找; 4,不然,使用指定的大小寫格式查詢; 另外的,若是在建立表的時候,使用的""把數據庫對象規定大小寫,就算數據庫標識符是使用的大寫,在這種狀況下也會使用給定的大小寫來建立表名; 這個時候,請設置delimitIdentifiers="true"便可保留大小寫格式; 可選: 1,schema:數據庫的schema; 2,catalog:數據庫的catalog; 3,alias:爲數據表設置的別名,若是設置了alias,那麼生成的全部的SELECT SQL語句中,列名會變成:alias_actualColumnName 4,domainObjectName:生成的domain類的名字,若是不設置,直接使用表名做爲domain類的名字;能夠設置爲somepck.domainName,那麼會自動把domainName類再放到somepck包裏面; 5,enableInsert(默認true):指定是否生成insert語句; 6,enableSelectByPrimaryKey(默認true):指定是否生成按照主鍵查詢對象的語句(就是getById或get); 7,enableSelectByExample(默認true):MyBatis3Simple爲false,指定是否生成動態查詢語句; 8,enableUpdateByPrimaryKey(默認true):指定是否生成按照主鍵修改對象的語句(即update); 9,enableDeleteByPrimaryKey(默認true):指定是否生成按照主鍵刪除對象的語句(即delete); 10,enableDeleteByExample(默認true):MyBatis3Simple爲false,指定是否生成動態刪除語句; 11,enableCountByExample(默認true):MyBatis3Simple爲false,指定是否生成動態查詢總條數語句(用於分頁的總條數查詢); 12,enableUpdateByExample(默認true):MyBatis3Simple爲false,指定是否生成動態修改語句(只修改對象中不爲空的屬性); 13,modelType:參考context元素的defaultModelType,至關於覆蓋; 14,delimitIdentifiers:參考tableName的解釋,注意,默認的delimitIdentifiers是雙引號,若是相似MYSQL這樣的數據庫,使用的是`(反引號,那麼還須要設置context的beginningDelimiter和endingDelimiter屬性) 15,delimitAllColumns:設置是否全部生成的SQL中的列名都使用標識符引發來。默認爲false,delimitIdentifiers參考context的屬性 注意,table裏面不少參數都是對javaModelGenerator,context等元素的默認屬性的一個複寫; --> <table tableName="user" domainObjectName="User"> <!-- 參考 javaModelGenerator 的 constructorBased屬性--> <property name="constructorBased" value="false"/> <!-- 默認爲false,若是設置爲true,在生成的SQL中,table名字不會加上catalog或schema; --> <property name="ignoreQualifiersAtRuntime" value="false"/> <!-- 參考 javaModelGenerator 的 immutable 屬性 --> <property name="immutable" value="false"/> <!-- 指定是否只生成domain類,若是設置爲true,只生成domain類,若是還配置了sqlMapGenerator,那麼在mapper XML文件中,只生成resultMap元素 --> <property name="modelOnly" value="false"/> <!-- 參考 javaModelGenerator 的 rootClass 屬性 <property name="rootClass" value=""/> --> <!-- 參考javaClientGenerator 的 rootInterface 屬性 <property name="rootInterface" value=""/> --> <!-- 若是設置了runtimeCatalog,那麼在生成的SQL中,使用該指定的catalog,而不是table元素上的catalog <property name="runtimeCatalog" value=""/> --> <!-- 若是設置了runtimeSchema,那麼在生成的SQL中,使用該指定的schema,而不是table元素上的schema <property name="runtimeSchema" value=""/> --> <!-- 若是設置了runtimeTableName,那麼在生成的SQL中,使用該指定的tablename,而不是table元素上的tablename <property name="runtimeTableName" value=""/> --> <!-- 注意,該屬性只針對MyBatis3Simple有用; 若是選擇的runtime是MyBatis3Simple,那麼會生成一個SelectAll方法,若是指定了selectAllOrderByClause,那麼會在該SQL中添加指定的這個order條件; --> <property name="selectAllOrderByClause" value="age desc,username asc"/> <!-- 若是設置爲true,生成的model類會直接使用column自己的名字,而不會再使用駝峯命名方法,好比BORN_DATE,生成的屬性名字就是BORN_DATE,而不會是bornDate --> <property name="useActualColumnNames" value="false"/> <!-- generatedKey用於生成生成主鍵的方法, 若是設置了該元素,MBG會在生成的<insert>元素中生成一條正確的<selectKey>元素,該元素可選 column:主鍵的列名; sqlStatement:要生成的selectKey語句,有如下可選項: Cloudscape:至關於selectKey的SQL爲: VALUES IDENTITY_VAL_LOCAL() DB2 :至關於selectKey的SQL爲: VALUES IDENTITY_VAL_LOCAL() DB2_MF :至關於selectKey的SQL爲:SELECT IDENTITY_VAL_LOCAL() FROM SYSIBM.SYSDUMMY1 Derby :至關於selectKey的SQL爲:VALUES IDENTITY_VAL_LOCAL() HSQLDB :至關於selectKey的SQL爲:CALL IDENTITY() Informix :至關於selectKey的SQL爲:select dbinfo('sqlca.sqlerrd1') from systables where tabid=1 MySql :至關於selectKey的SQL爲:SELECT LAST_INSERT_ID() SqlServer :至關於selectKey的SQL爲:SELECT SCOPE_IDENTITY() SYBASE :至關於selectKey的SQL爲:SELECT @@IDENTITY JDBC :至關於在生成的insert元素上添加useGeneratedKeys="true"和keyProperty屬性 <generatedKey column="" sqlStatement=""/> --> <!-- 該元素會在根據表中列名計算對象屬性名以前先重命名列名,很是適合用於表中的列都有公用的前綴字符串的時候, 好比列名爲:CUST_ID,CUST_NAME,CUST_EMAIL,CUST_ADDRESS等; 那麼就能夠設置searchString爲"^CUST_",並使用空白替換,那麼生成的Customer對象中的屬性名稱就不是 custId,custName等,而是先被替換爲ID,NAME,EMAIL,而後變成屬性:id,name,email; 注意,MBG是使用java.util.regex.Matcher.replaceAll來替換searchString和replaceString的, 若是使用了columnOverride元素,該屬性無效; <columnRenamingRule searchString="" replaceString=""/> --> <!-- 用來修改表中某個列的屬性,MBG會使用修改後的列來生成domain的屬性; column:要從新設置的列名; 注意,一個table元素中能夠有多個columnOverride元素 property : 使用property屬性來指定列要生成的屬性名稱 javaType : 用於指定生成的domain的屬性類型,使用類型的全限定名 jdbcType : 用於指定該列的JDBC類型 typeHandler : 用於指定該列使用到的TypeHandler,若是要指定,配置類型處理器的全限定名 delimitedColumnName : 參考table元素的delimitAllColumns配置,默認爲false 注意,mybatis中,不會生成到mybatis-config.xml中的typeHandler 只會生成相似:where id = #{id,jdbcType=BIGINT,typeHandler=com._520it.mybatis.MyTypeHandler}的參數描述 --> <columnOverride column="name" property="name"/> <!-- ignoreColumn設置一個MGB忽略的列,若是設置了改列,那麼在生成的domain中,生成的SQL中,都不會有該列出現 column:指定要忽略的列的名字; delimitedColumnName:參考table元素的delimitAllColumns配置,默認爲false 注意,一個table元素中能夠有多個ignoreColumn元素 <ignoreColumn column="deptId" delimitedColumnName=""/> --> </table> </context> </generatorConfiguration>
三、引入日誌文件:
log4j.rootLogger = debug,stdout ### 輸出信息到控制擡 ### log4j.appender.stdout = org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target = System.out log4j.appender.stdout.layout = org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n ### 輸出DEBUG 級別以上的日誌到=E://logs/error.log ### log4j.appender.D = org.apache.log4j.DailyRollingFileAppender log4j.appender.D.File = E://logs/log.log log4j.appender.D.Append = true log4j.appender.D.Threshold = DEBUG log4j.appender.D.layout = org.apache.log4j.PatternLayout log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n ### 輸出ERROR 級別以上的日誌到=E://logs/error.log ### log4j.appender.E = org.apache.log4j.DailyRollingFileAppender log4j.appender.E.File =E://logs/error.log log4j.appender.E.Append = true log4j.appender.E.Threshold = ERROR log4j.appender.E.layout = org.apache.log4j.PatternLayout log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n
四、引入可執行 java 類:
import org.apache.ibatis.io.Resources; import org.mybatis.generator.api.MyBatisGenerator; import org.mybatis.generator.config.Configuration; import org.mybatis.generator.config.xml.ConfigurationParser; import org.mybatis.generator.internal.DefaultShellCallback; import java.io.File; import java.util.ArrayList; import java.util.List; @SuppressWarnings("all") public class Generator { public void generator() throws Exception { List<String> warnings = new ArrayList<String>(); boolean overwrite = true; /**指向逆向工程配置文件*/ File configFile = Resources.getResourceAsFile("generatorConfig.xml"); ConfigurationParser parser = new ConfigurationParser(warnings); Configuration config = parser.parseConfiguration(configFile); DefaultShellCallback callback = new DefaultShellCallback(overwrite); MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings); myBatisGenerator.generate(null); } public static void main(String[] args) throws Exception { try { Generator generatorSqlmap = new Generator(); generatorSqlmap.generator(); } catch (Exception e) { e.printStackTrace(); } } }
五、在‘generatorConfig.xml’中完成相關配置,執行 Generator 便可。
package com.zze.mybaits.test; import com.zze.mybatis.mapper.UserMapper; import com.zze.mybatis.pojo.User; import com.zze.mybatis.pojo.UserExample; import org.junit.Before; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.List; public class UserMapperTest { private ApplicationContext applicationContext; private UserMapper userMapper; @Before public void init() { applicationContext = new ClassPathXmlApplicationContext("classpath:config/applicationContext.xml"); userMapper = applicationContext.getBean(UserMapper.class); } @Test public void testSelectByPrimaryKey() { User user = userMapper.selectByPrimaryKey(2); System.out.println(user); /* ==> Preparing: select id, name, gender, birthday, address from user where id = ? ==> Parameters: 2(Integer) */ } /** * 指定條件查詢返回列表 */ @Test public void testSelectByExample() { UserExample userExample = new UserExample(); UserExample.Criteria criteria = userExample.createCriteria(); criteria.andNameLike("%郭%"); List<User> userList = userMapper.selectByExample(userExample); userList.forEach(u -> System.out.println(u)); /* ==> Preparing: select id, name, gender, birthday, address from user WHERE ( name like ? ) ==> Parameters: %郭%(String) */ } /** * 新增非空字段 */ @Test public void testInsertSelective() throws ParseException { userMapper.insertSelective(new User(null, "郭德綱", "男", new SimpleDateFormat("yyyy-MM-dd").parse("1997-1-1"), null)); /* ==> Preparing: insert into user ( name, gender, birthday ) values ( ?, ?, ? ) ==> Parameters: 郭德綱(String), 男(String), 1997-01-01(Date) */ } /** * 新增所有 */ @Test public void testInsert() throws ParseException { userMapper.insert(new User(null, "郭德綱", "男", new SimpleDateFormat("yyyy-MM-dd").parse("1997-1-1"), null)); /* ==> Preparing: insert into user (id, name, gender, birthday, address) values (?, ?, ?, ?, ?) ==> Parameters: null, 郭德綱(String), 男(String), 1997-01-01(Date), null */ } /** * 修改非空字段 */ @Test public void testUpdateByPrimaryKeySelective() { userMapper.updateByPrimaryKeySelective(new User(1, "周華健", "男", null, null)); /* ==> Preparing: update user SET name = ?, gender = ? where id = ? ==> Parameters: 周華健(String), 男(String), 1(Integer) */ } /** * 修改所有 */ @Test public void testUpdateByPrimaryKey() { userMapper.updateByPrimaryKey(new User(1, "周華健", "男", null, null)); /* ==> Preparing: update user set name = ?, gender = ?, birthday = ?, address = ? where id = ? ==> Parameters: 周華健(String), 男(String), null, null, 1(Integer) */ } /** * 指定條件批量刪除 */ @Test public void testDeleteByExample() { UserExample userExample = new UserExample(); // 刪除名字中包含郭字的記錄 userExample.createCriteria().andNameLike("%郭%"); userMapper.deleteByExample(userExample); /* ==> Preparing: delete from user WHERE ( name like ? ) ==> Parameters: %郭%(String) */ } /** * 根據主鍵刪除 */ @Test public void testDeleteByPrimaryKey() { userMapper.deleteByPrimaryKey(10); /* ==> Preparing: delete from user where id = ? ==> Parameters: 10(Integer) */ } /** * 條件查詢記錄條數 */ @Test public void testCountByExample() { UserExample userExample = new UserExample(); userExample.createCriteria().andNameLike("%周%"); long l = userMapper.countByExample(userExample); System.out.println(l); /* ==> Preparing: select count(*) from user WHERE ( name like ? ) ==> Parameters: %周%(String) */ } }