mybatis 學習視頻總結記錄

時間 2019-11-11

原文原文鏈接

學習mybaits簡單增刪改查例子記錄 css

此整理是學習視頻後的視頻內容整理，後半段尚未整理html

網易雲課堂 SSM高級整合視頻地址： http://study.163.com/course/courseMain.htm?courseId=1003862031 很是好的視頻教程適合入門

最後項目目錄以下圖：前端

數據庫表sql 爲：java

USE `ssm`;

/*Table structure for table `tbl_dept` */

DROP TABLE IF EXISTS `tbl_dept`;

CREATE TABLE `tbl_dept` (
  `dept_id` int(11) NOT NULL AUTO_INCREMENT,
  `dept_name` varchar(255) NOT NULL,
  PRIMARY KEY (`dept_id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

/*Table structure for table `tbl_emp` */

DROP TABLE IF EXISTS `tbl_emp`;

CREATE TABLE `tbl_emp` (
  `emp_id` int(11) NOT NULL AUTO_INCREMENT,
  `emp_name` varchar(255) NOT NULL,
  `gender` char(1) DEFAULT NULL,
  `email` varchar(255) DEFAULT NULL,
  `d_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`emp_id`),
  KEY `fk_emp_dept` (`d_id`),
  CONSTRAINT `fk_emp_dept` FOREIGN KEY (`d_id`) REFERENCES `tbl_dept` (`dept_id`) ON DELETE NO ACTION
) ENGINE=InnoDB AUTO_INCREMENT=1001 DEFAULT CHARSET=utf8;

建立maven項目目錄結構 ssm-crud 引入須要用到jar包 pom文件爲：mysql

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.lixuchun</groupId>
  <artifactId>ssm-crud</artifactId>
  <packaging>pom</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>ssm-crud Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
      <dependency>
      <groupId>org.mybatis.generator</groupId>
      <artifactId>mybatis-generator-core</artifactId>
      <version>1.3.5</version>
    </dependency>
        <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.8.8</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <!-- 引入pagehelper分頁插件 -->
    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>5.0.0</version>
    </dependency>
    <!-- 引入springmvc spring 包 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.3.7.RELEASE</version>
    </dependency>
    <!-- spring jdbc -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>4.3.7.RELEASE</version>
    </dependency>
    
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>4.3.7.RELEASE</version>
      <scope>test</scope>
    </dependency>
    
    <!-- spring aop -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aspects</artifactId>
      <version>4.3.7.RELEASE</version>
    </dependency>
    
    <!-- mybaits -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.2</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.1</version>
    </dependency>
    
    <!-- 數據庫鏈接池 -->
    <dependency>
      <groupId>com.mchange</groupId>
      <artifactId>c3p0</artifactId>
      <version>0.9.2</version>
    </dependency>
    
    <!-- 數據庫驅動 -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.41</version>
    </dependency>
    
    <!-- jstl servlet-api -->
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.0.1</version>
        <scope>provided</scope>
    </dependency>
    
  </dependencies>
  <build>
    <finalName>ssm-crud</finalName>
  </build>
  <modules>
      <module>?</module>
  </modules>
</project>

修改web.xml 文件最後 web.xml文件爲jquery

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    id="WebApp_ID" version="2.5">

    <!--一、啓動Spring的容器 -->
    <!-- needed for ContextLoaderListener -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    <!-- Bootstraps the root web application context before servlet initialization -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    
    <!--二、springmvc的前端控制器，攔截全部請求  -->  
    <!-- The front controller of this Spring Web application, responsible for handling all application requests -->  
    <servlet>  
        <servlet-name>dispatcherServlet</servlet-name>  
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
        <load-on-startup>1</load-on-startup>  
    </servlet>
    
       <!-- Map all requests to the DispatcherServlet for handling -->  
    <servlet-mapping>  
        <servlet-name>dispatcherServlet</servlet-name>  
        <url-pattern>/</url-pattern>  
    </servlet-mapping>

    <!-- 三、字符編碼過濾器，必定要放在全部過濾器以前 forceRequestEncoding response 分別設置響應請求編碼 -->
    <filter>
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceRequestEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
        <init-param>
            <param-name>forceResponseEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    
    <filter-mapping>  
        <filter-name>CharacterEncodingFilter</filter-name>  
        <url-pattern>/*</url-pattern>  
    </filter-mapping>

    <!-- 四、使用Rest風格的URI，將頁面普通的post請求轉爲指定的delete或者put請求 -->
    <filter>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <filter>
        <filter-name>HttpPutFormContentFilter</filter-name>
        <filter-class>org.springframework.web.filter.HttpPutFormContentFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>HttpPutFormContentFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>  
</web-app>

添加springmvc配置文件，對應名稱爲web.xml 中 dispatcherServlet 都加上 -servlet dispatcherServlet-servlet.xmlgit

<?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:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd">

    <!-- SpringMvc的配置文件，包含網站跳轉文件的配置 -->
    <context:component-scan base-package="com.lixuchun" use-default-filters="false">
    <!-- -只掃描控制器 -->
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!-- ，配置視圖解析器 如何把 handler 方法返回值解析爲實際的物理視圖，jsp路徑的前綴和後綴 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

    <!-- 兩個標準配置 -->
    <!-- 將springmvc不能處理的請求交給tomcat -->
    <mvc:default-servlet-handler/>
    <!-- 能支持springmvc更高級的一些功能,JRS303校驗，ajax請求..映射動態請求 -->
    <mvc:annotation-driven></mvc:annotation-driven>

</beans>

配置spring 添加applicationContext.xml配置文件github

<?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"  
    xmlns:aop="http://www.springframework.org/schema/aop"  
    xmlns:tx="http://www.springframework.org/schema/tx"  
    xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd  
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd  
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd  
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">  

          <context:component-scan base-package="com.lixuchun">
            <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>  
        </context:component-scan>
        <context:property-placeholder location="classpath:dbconfig.properties"/>

        <bean id="pooledDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">  
            <property name="jdbcUrl" value="${jdbc.url}"></property>  
            <property name="driverClass" value="${jdbc.driverClass}"></property>  
            <property name="user" value="${jdbc.username}"></property>  
            <property name="password" value="${jdbc.password}"></property>  
        </bean>
        
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">  
            <property name="configLocation" value="classpath:mybatis-config.xml"></property>
            <property name="dataSource" ref="pooledDataSource"></property>
            <property name="mapperLocations" value="classpath:mapper/*.xml"></property>
        </bean>
        
        <!-- 配置掃描器，將mybatis接口的實現加入到ioc容器中 -->
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <!-- 掃描全部的dao接口的實現,加入到ioc容器中 -->
            <property name="basePackage" value="com.lixuchun.crud.dao"></property>
        </bean>
        
        <!-- 配置一個能夠執行批量的sqlSession  批量數據庫操做 -->
        <bean id="sqlSession"  class="org.mybatis.spring.SqlSessionTemplate" >
            <constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory"></constructor-arg>
            <constructor-arg name="executorType" value="BATCH"></constructor-arg>
        </bean>
        
        <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <!-- 控制數據源 -->
            <property name="dataSource" ref="pooledDataSource"></property>
        </bean>
        
        <!-- 開啓基於註解的事務，使用xml配置形式的事務(必要主要的都是使用配置) -->
        <aop:config>
            <!-- 切入點表達式 -->
            <aop:pointcut id="txPoint" expression="execution(* com.lixuchun.crud.service..*(..))"/>
            <!-- 配置事務加強  指明切入點-->
            <aop:advisor advice-ref="txAdvice" pointcut-ref="txPoint"/>
        </aop:config>
        
        <!-- 事午增強 -->
        <tx:advice id="txAdvice" transaction-manager="transactionManager">
            <tx:attributes> 
                <!-- 全部方法都是事務方法 -->
                <tx:method name="*"/>
                <!-- 以get開始的全部方法 -->
                <tx:method name="get*" read-only="true"/>
            </tx:attributes>
        </tx:advice>
        
 </beans>

建立數據庫配置文件dbconfig.propertiesweb

jdbc.url=jdbc:mysql://127.0.0.1:3306/ssm?characterEncoding=utf8&useSSL=true
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.username=root
jdbc.password=101022

建立mybatis-config.xml ajax

<?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>
    <!-- 駝峯命名 -->
    <settings>
        <setting name="mapUnderscoreToCamelCase" value="true" />
    </settings>
    <!-- 別名 -->
    <typeAliases>
        <package name="com.lixuchun.crud.bean" />
    </typeAliases>
    <!-- mybaits 分頁插件 -->
    <plugins>
        <plugin interceptor="com.github.pagehelper.PageInterceptor">
            <property name="reasonable" value="true"/>
        </plugin>
    </plugins>
</configuration>

建立 entity包 com.lixuchun.crud.bean 建立bean

Department

package com.lixuchun.crud.bean;

public class Department {
    private Integer deptId;

    private String deptName;

    public Department() {
        super();
    }

    public Department(Integer deptId, String deptName) {
        super();
        this.deptId = deptId;
        this.deptName = deptName;
    }

    public Integer getDeptId() {
        return deptId;
    }

    public void setDeptId(Integer deptId) {
        this.deptId = deptId;
    }

    public String getDeptName() {
        return deptName;
    }

    public void setDeptName(String deptName) {
        this.deptName = deptName == null ? null : deptName.trim();
    }
}

Employee

package com.lixuchun.crud.bean;

public class Employee {
    private Integer empId;

    private String empName;

    private String gender;

    private String email;

    private Integer dId;

    public Employee() {
        super();
    }

    public Employee(Integer empId, String empName, String gender, String email, Integer dId) {
        super();
        this.empId = empId;
        this.empName = empName;
        this.gender = gender;
        this.email = email;
        this.dId = dId;
    }

    // 但願查詢員工時候 部門信息也有顯示
    private Department department;
    
    
    public Department getDepartment() {
        return department;
    }

    public void setDepartment(Department department) {
        this.department = department;
    }

    public Integer getEmpId() {
        return empId;
    }

    public void setEmpId(Integer empId) {
        this.empId = empId;
    }

    public String getEmpName() {
        return empName;
    }

    public void setEmpName(String empName) {
        this.empName = empName == null ? null : empName.trim();
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender == null ? null : gender.trim();
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email == null ? null : email.trim();
    }

    public Integer getdId() {
        return dId;
    }

    public void setdId(Integer dId) {
        this.dId = dId;
    }
}

建立通用返回類Message

package com.lixuchun.crud.bean;

import java.util.HashMap;
import java.util.Map;

/**
 * 通用返回類
 * @author UPC
 *
 */
public class Message {
    /**
     * 狀態碼 100 成功 200失敗
     */
    private int code;
    
    // 提示信息
    private String msg;
    
    private Map<String, Object> extend = new HashMap<String, Object>();

    public int getCode() {
        return code;
    }

    public static Message success() {
        Message msg = new Message();
        msg.setCode(100);
        msg.setMsg("success");
        return msg;
    }
    
    public static Message fail() {
        Message msg = new Message();
        msg.setCode(200);
        msg.setMsg("fail");
        return msg;
    }
    
    public Message add(String key, Object value) {
        this.getExtend().put(key, value);
        return this;
    }
    
    public void setCode(int code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public Map<String, Object> getExtend() {
        return extend;
    }

    public void setExtend(Map<String, Object> extend) {
        this.extend = extend;
    }
    
}

建立dao 包 com.lixuchun.crud.dao

DepartmentMapper

package com.lixuchun.crud.dao;

import com.lixuchun.crud.bean.Department;
import com.lixuchun.crud.bean.DepartmentExample;
import java.util.List;
import org.apache.ibatis.annotations.Param;

public interface DepartmentMapper {
    long countByExample(DepartmentExample example);

    int deleteByExample(DepartmentExample example);

    int deleteByPrimaryKey(Integer deptId);

    int insert(Department record);

    int insertSelective(Department record);

    List<Department> selectByExample(DepartmentExample example);

    Department selectByPrimaryKey(Integer deptId);

    int updateByExampleSelective(@Param("record") Department record, @Param("example") DepartmentExample example);

    int updateByExample(@Param("record") Department record, @Param("example") DepartmentExample example);

    int updateByPrimaryKeySelective(Department record);

    int updateByPrimaryKey(Department record);
}

EmployeeMapper

package com.lixuchun.crud.dao;

import com.lixuchun.crud.bean.Employee;
import com.lixuchun.crud.bean.EmployeeExample;
import java.util.List;
import org.apache.ibatis.annotations.Param;

public interface EmployeeMapper {
    long countByExample(EmployeeExample example);

    int deleteByExample(EmployeeExample example);

    int deleteByPrimaryKey(Integer empId);

    int insert(Employee record);

    int insertSelective(Employee record);

    List<Employee> selectByExample(EmployeeExample example);

    Employee selectByPrimaryKey(Integer empId);
    
    List<Employee> selectByExampleWithDept(EmployeeExample example);

    Employee selectByPrimaryKeyWithDept(Integer empId);

    int updateByExampleSelective(@Param("record") Employee record, @Param("example") EmployeeExample example);

    int updateByExample(@Param("record") Employee record, @Param("example") EmployeeExample example);

    int updateByPrimaryKeySelective(Employee record);

    int updateByPrimaryKey(Employee record);
}

建立dao實現mapper

DepartmentMapper.xml

<?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.lixuchun.crud.dao.DepartmentMapper">
  <resultMap id="BaseResultMap" type="com.lixuchun.crud.bean.Department">
    <id column="dept_id" jdbcType="INTEGER" property="deptId" />
    <result column="dept_name" jdbcType="VARCHAR" property="deptName" />
  </resultMap>
  <sql id="Example_Where_Clause">
    <where>
      <foreach collection="oredCriteria" item="criteria" separator="or">
        <if test="criteria.valid">
          <trim prefix="(" prefixOverrides="and" suffix=")">
            <foreach collection="criteria.criteria" item="criterion">
              <choose>
                <when test="criterion.noValue">
                  and ${criterion.condition}
                </when>
                <when test="criterion.singleValue">
                  and ${criterion.condition} #{criterion.value}
                </when>
                <when test="criterion.betweenValue">
                  and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                </when>
                <when test="criterion.listValue">
                  and ${criterion.condition}
                  <foreach close=")" collection="criterion.value" item="listItem" open="(" separator=",">
                    #{listItem}
                  </foreach>
                </when>
              </choose>
            </foreach>
          </trim>
        </if>
      </foreach>
    </where>
  </sql>
  <sql id="Update_By_Example_Where_Clause">
    <where>
      <foreach collection="example.oredCriteria" item="criteria" separator="or">
        <if test="criteria.valid">
          <trim prefix="(" prefixOverrides="and" suffix=")">
            <foreach collection="criteria.criteria" item="criterion">
              <choose>
                <when test="criterion.noValue">
                  and ${criterion.condition}
                </when>
                <when test="criterion.singleValue">
                  and ${criterion.condition} #{criterion.value}
                </when>
                <when test="criterion.betweenValue">
                  and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                </when>
                <when test="criterion.listValue">
                  and ${criterion.condition}
                  <foreach close=")" collection="criterion.value" item="listItem" open="(" separator=",">
                    #{listItem}
                  </foreach>
                </when>
              </choose>
            </foreach>
          </trim>
        </if>
      </foreach>
    </where>
  </sql>
  <sql id="Base_Column_List">
    dept_id, dept_name
  </sql>
  <select id="selectByExample" parameterType="com.lixuchun.crud.bean.DepartmentExample" resultMap="BaseResultMap">
    select
    <if test="distinct">
      distinct
    </if>
    <include refid="Base_Column_List" />
    from tbl_dept
    <if test="_parameter != null">
      <include refid="Example_Where_Clause" />
    </if>
    <if test="orderByClause != null">
      order by ${orderByClause}
    </if>
  </select>
  <select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from tbl_dept
    where dept_id = #{deptId,jdbcType=INTEGER}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
    delete from tbl_dept
    where dept_id = #{deptId,jdbcType=INTEGER}
  </delete>
  <delete id="deleteByExample" parameterType="com.lixuchun.crud.bean.DepartmentExample">
    delete from tbl_dept
    <if test="_parameter != null">
      <include refid="Example_Where_Clause" />
    </if>
  </delete>
  <insert id="insert" parameterType="com.lixuchun.crud.bean.Department">
    insert into tbl_dept (dept_id, dept_name)
    values (#{deptId,jdbcType=INTEGER}, #{deptName,jdbcType=VARCHAR})
  </insert>
  <insert id="insertSelective" parameterType="com.lixuchun.crud.bean.Department">
    insert into tbl_dept
    <trim prefix="(" suffix=")" suffixOverrides=",">
      <if test="deptId != null">
        dept_id,
      </if>
      <if test="deptName != null">
        dept_name,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
      <if test="deptId != null">
        #{deptId,jdbcType=INTEGER},
      </if>
      <if test="deptName != null">
        #{deptName,jdbcType=VARCHAR},
      </if>
    </trim>
  </insert>
  <select id="countByExample" parameterType="com.lixuchun.crud.bean.DepartmentExample" resultType="java.lang.Long">
    select count(*) from tbl_dept
    <if test="_parameter != null">
      <include refid="Example_Where_Clause" />
    </if>
  </select>
  <update id="updateByExampleSelective" parameterType="map">
    update tbl_dept
    <set>
      <if test="record.deptId != null">
        dept_id = #{record.deptId,jdbcType=INTEGER},
      </if>
      <if test="record.deptName != null">
        dept_name = #{record.deptName,jdbcType=VARCHAR},
      </if>
    </set>
    <if test="_parameter != null">
      <include refid="Update_By_Example_Where_Clause" />
    </if>
  </update>
  <update id="updateByExample" parameterType="map">
    update tbl_dept
    set dept_id = #{record.deptId,jdbcType=INTEGER},
      dept_name = #{record.deptName,jdbcType=VARCHAR}
    <if test="_parameter != null">
      <include refid="Update_By_Example_Where_Clause" />
    </if>
  </update>
  <update id="updateByPrimaryKeySelective" parameterType="com.lixuchun.crud.bean.Department">
    update tbl_dept
    <set>
      <if test="deptName != null">
        dept_name = #{deptName,jdbcType=VARCHAR},
      </if>
    </set>
    where dept_id = #{deptId,jdbcType=INTEGER}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.lixuchun.crud.bean.Department">
    update tbl_dept
    set dept_name = #{deptName,jdbcType=VARCHAR}
    where dept_id = #{deptId,jdbcType=INTEGER}
  </update>
</mapper>

EmployeeMapper.xml

<?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.lixuchun.crud.dao.EmployeeMapper">

  <resultMap id="BaseResultMap" type="com.lixuchun.crud.bean.Employee">
    <id column="emp_id" jdbcType="INTEGER" property="empId" />
    <result column="emp_name" jdbcType="VARCHAR" property="empName" />
    <result column="gender" jdbcType="CHAR" property="gender" />
    <result column="email" jdbcType="VARCHAR" property="email" />
    <result column="d_id" jdbcType="INTEGER" property="dId" />
  </resultMap>

  <resultMap type="com.lixuchun.crud.bean.Employee" id="WithDeptResultMap">
      <id column="emp_id" jdbcType="INTEGER" property="empId" />
    <result column="emp_name" jdbcType="VARCHAR" property="empName" />
    <result column="gender" jdbcType="CHAR" property="gender" />
    <result column="email" jdbcType="VARCHAR" property="email" />
    <result column="d_id" jdbcType="INTEGER" property="dId" />
    <association property="department" javaType="com.lixuchun.crud.bean.Department">
        <id column="dept_id" property="deptId"/>
        <result column="dept_name" property="deptName"/>
    </association>
  </resultMap>

  <sql id="Example_Where_Clause">
    <where>
      <foreach collection="oredCriteria" item="criteria" separator="or">
        <if test="criteria.valid">
          <trim prefix="(" prefixOverrides="and" suffix=")">
            <foreach collection="criteria.criteria" item="criterion">
              <choose>
                <when test="criterion.noValue">
                  and ${criterion.condition}
                </when>
                <when test="criterion.singleValue">
                  and ${criterion.condition} #{criterion.value}
                </when>
                <when test="criterion.betweenValue">
                  and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                </when>
                <when test="criterion.listValue">
                  and ${criterion.condition}
                  <foreach close=")" collection="criterion.value" item="listItem" open="(" separator=",">
                    #{listItem}
                  </foreach>
                </when>
              </choose>
            </foreach>
          </trim>
        </if>
      </foreach>
    </where>
  </sql>
  <sql id="Update_By_Example_Where_Clause">
    <where>
      <foreach collection="example.oredCriteria" item="criteria" separator="or">
        <if test="criteria.valid">
          <trim prefix="(" prefixOverrides="and" suffix=")">
            <foreach collection="criteria.criteria" item="criterion">
              <choose>
                <when test="criterion.noValue">
                  and ${criterion.condition}
                </when>
                <when test="criterion.singleValue">
                  and ${criterion.condition} #{criterion.value}
                </when>
                <when test="criterion.betweenValue">
                  and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                </when>
                <when test="criterion.listValue">
                  and ${criterion.condition}
                  <foreach close=")" collection="criterion.value" item="listItem" open="(" separator=",">
                    #{listItem}
                  </foreach>
                </when>
              </choose>
            </foreach>
          </trim>
        </if>
      </foreach>
    </where>
  </sql>
  <sql id="Base_Column_List">
    emp_id, emp_name, gender, email, d_id
  </sql>
  
  <sql id="With_Dept_Column_List">
    e.emp_id, e.emp_name, e.gender, e.email, e.d_id, d.dept_id, d.dept_name
  </sql>
  <!-- 
      List selectByExampleWithDept
      selectByPrimaryKeyWithDept
   -->
  <!-- 查詢帶部門 -->
   <select id="selectByExampleWithDept" resultMap="WithDeptResultMap">
    select
    <if test="distinct">
        distinct
    </if>
    <include refid="With_Dept_Column_List" />
    FROM tbl_emp e
    left join tbl_dept d on e.d_id=d.dept_id
    <if test="_parameter != null">
        <include refid="Example_Where_Clause" />
    </if>
    <if test="orderByClause != null">
        order by ${orderByClause}
    </if>
  </select> 
  <select id="selectByPrimaryKeyWithDept" resultMap="WithDeptResultMap">
      select 
    <include refid="With_Dept_Column_List" />
    from tbl_emp e left join tbl_dept d on e.'d_id'=d.'dept_id'
    where emp_id = #{empId,jdbcType=INTEGER}
  </select>
  
  <!-- ===================================================== -->
  <!-- 查詢不帶部門 -->
  <select id="selectByExample" parameterType="com.lixuchun.crud.bean.EmployeeExample" resultMap="BaseResultMap">
    select
    <if test="distinct">
      distinct
    </if>
    <include refid="Base_Column_List" />
    from tbl_emp
    <if test="_parameter != null">
      <include refid="Example_Where_Clause" />
    </if>
    <if test="orderByClause != null">
      order by ${orderByClause}
    </if>
  </select>
  <select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from tbl_emp
    where emp_id = #{empId,jdbcType=INTEGER}
  </select>
  
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
    delete from tbl_emp
    where emp_id = #{empId,jdbcType=INTEGER}
  </delete>
  <delete id="deleteByExample" parameterType="com.lixuchun.crud.bean.EmployeeExample">
    delete from tbl_emp
    <if test="_parameter != null">
      <include refid="Example_Where_Clause" />
    </if>
  </delete>
  <insert id="insert" parameterType="com.lixuchun.crud.bean.Employee">
    insert into tbl_emp (emp_id, emp_name, gender, 
      email, d_id)
    values (#{empId,jdbcType=INTEGER}, #{empName,jdbcType=VARCHAR}, #{gender,jdbcType=CHAR}, 
      #{email,jdbcType=VARCHAR}, #{dId,jdbcType=INTEGER})
  </insert>
  <insert id="insertSelective" parameterType="com.lixuchun.crud.bean.Employee">
    insert into tbl_emp
    <trim prefix="(" suffix=")" suffixOverrides=",">
      <if test="empId != null">
        emp_id,
      </if>
      <if test="empName != null">
        emp_name,
      </if>
      <if test="gender != null">
        gender,
      </if>
      <if test="email != null">
        email,
      </if>
      <if test="dId != null">
        d_id,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
      <if test="empId != null">
        #{empId,jdbcType=INTEGER},
      </if>
      <if test="empName != null">
        #{empName,jdbcType=VARCHAR},
      </if>
      <if test="gender != null">
        #{gender,jdbcType=CHAR},
      </if>
      <if test="email != null">
        #{email,jdbcType=VARCHAR},
      </if>
      <if test="dId != null">
        #{dId,jdbcType=INTEGER},
      </if>
    </trim>
  </insert>
  <select id="countByExample" parameterType="com.lixuchun.crud.bean.EmployeeExample" resultType="java.lang.Long">
    select count(*) from tbl_emp
    <if test="_parameter != null">
      <include refid="Example_Where_Clause" />
    </if>
  </select>
  <update id="updateByExampleSelective" parameterType="map">
    update tbl_emp
    <set>
      <if test="record.empId != null">
        emp_id = #{record.empId,jdbcType=INTEGER},
      </if>
      <if test="record.empName != null">
        emp_name = #{record.empName,jdbcType=VARCHAR},
      </if>
      <if test="record.gender != null">
        gender = #{record.gender,jdbcType=CHAR},
      </if>
      <if test="record.email != null">
        email = #{record.email,jdbcType=VARCHAR},
      </if>
      <if test="record.dId != null">
        d_id = #{record.dId,jdbcType=INTEGER},
      </if>
    </set>
    <if test="_parameter != null">
      <include refid="Update_By_Example_Where_Clause" />
    </if>
  </update>
  <update id="updateByExample" parameterType="map">
    update tbl_emp
    set emp_id = #{record.empId,jdbcType=INTEGER},
      emp_name = #{record.empName,jdbcType=VARCHAR},
      gender = #{record.gender,jdbcType=CHAR},
      email = #{record.email,jdbcType=VARCHAR},
      d_id = #{record.dId,jdbcType=INTEGER}
    <if test="_parameter != null">
      <include refid="Update_By_Example_Where_Clause" />
    </if>
  </update>
  <update id="updateByPrimaryKeySelective" parameterType="com.lixuchun.crud.bean.Employee">
    update tbl_emp
    <set>
      <if test="empName != null">
        emp_name = #{empName,jdbcType=VARCHAR},
      </if>
      <if test="gender != null">
        gender = #{gender,jdbcType=CHAR},
      </if>
      <if test="email != null">
        email = #{email,jdbcType=VARCHAR},
      </if>
      <if test="dId != null">
        d_id = #{dId,jdbcType=INTEGER},
      </if>
    </set>
    where emp_id = #{empId,jdbcType=INTEGER}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.lixuchun.crud.bean.Employee">
    update tbl_emp
    set emp_name = #{empName,jdbcType=VARCHAR},
      gender = #{gender,jdbcType=CHAR},
      email = #{email,jdbcType=VARCHAR},
      d_id = #{dId,jdbcType=INTEGER}
    where emp_id = #{empId,jdbcType=INTEGER}
  </update>
</mapper>

在src/test/java 下建立mappertest 文件測試

TestMapper

import java.util.List;

import org.apache.ibatis.session.SqlSession;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.lixuchun.crud.bean.Employee;
import com.lixuchun.crud.dao.DepartmentMapper;
import com.lixuchun.crud.dao.EmployeeMapper;
import com.lixuchun.crud.service.EmployeeService;

/**
 * 用spring 測試類測試
 * @author UPC
 * 1.導入springTest模塊
 * 2.
 *
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath:applicationContext.xml"})
public class TestMapper {

    @Autowired
    DepartmentMapper departmentMapper;
    
    @Autowired
    EmployeeMapper employeeMapper;
    
    @Autowired
    SqlSession sqlSession;

    @Autowired
    EmployeeService employeeService;
    
    @Test
    public void testCRUD() {
        // 插入點
        /*
        departmentMapper.insertSelective(new Department(null, "開發部"));
        departmentMapper.insertSelective(new Department(null, "測試部"));
        */

        // 生成一些員工數據
        //employeeMapper.insertSelective(new Employee(null, "jack", "M", "jack@mic.com", 1));
    
        // 批量插入多個員工-- 使用能夠執行批量操做的sqlsession
//        EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);
//        for (int i = 0; i<1000; i++) {
//            String uid = UUID.randomUUID().toString().substring(0, 5) + i;
//            mapper.insertSelective(new Employee(null, uid, "M", uid + "@mic.com", 1));
//        }
//        System.out.println("批量完成!");
        List<Employee> emps = employeeService.getAll();
        for (Employee emp : emps) {
            System.out.println(emp.getEmpName());
        }
    }
}

建立 test 包 com.lixuchun.crud.test

mvc_test

package com.lixuchun.crud.test;

import java.util.List;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mock.web.MockHttpServletRequest;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.web.WebAppConfiguration;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.MvcResult;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.context.WebApplicationContext;

import com.github.pagehelper.PageInfo;
import com.lixuchun.crud.bean.Employee;

/**
 * 使用Spring測試木塊提供的測試請求功能，測試crud請求的正確性
 * Spring4測試的時候，須要servlet3.0的支持
 * @author wp
 *
 */

@RunWith(SpringJUnit4ClassRunner.class)
@WebAppConfiguration
@ContextConfiguration(locations={"classpath:applicationContext.xml","file:src/main/webapp/WEB-INF/dispatcherServlet-servlet.xml"})
public class MVC_TEST {
     //傳入Springmvc的ioc
    @Autowired
    WebApplicationContext context;
    //虛擬mvc請求,獲取處處理結果
    MockMvc  movkMVC; 
    
    //junit的before  在每次使用以前都要初始化
    @Before
    public void initMockMvc(){
        movkMVC=MockMvcBuilders.webAppContextSetup(context).build();
    }
    
    
    @Test
    public void testPage() throws Exception{
        //模擬請求拿到返回值
        
        MvcResult result = movkMVC.perform(MockMvcRequestBuilders.get("/emps").param("pn", "3")).andReturn();
        //請求成功之後，請求域中會有pageInfo:咱們能夠取出pageinfo進行驗證
        MockHttpServletRequest request = result.getRequest();    
        PageInfo pi = (PageInfo)request.getAttribute("pageInfo");
        System.out.println("當前頁碼:"+pi.getPageNum());
        System.out.println("總頁碼:"+pi.getPages());
        System.out.println("總記錄數:"+pi.getTotal());
        System.out.println("在頁面須要連續顯示的頁碼");
        int[]  nums= pi.getNavigatepageNums();
        for(int i:nums){
            System.out.println(" "+i);
        }
        
        //獲取員工數據
        List<Employee> list= pi.getList();
        for(Employee employee : list ){
            System.out.println("ID:" +employee.getEmpId()+"==>Name:"+employee.getEmpName());
        }
        
    }
}

建立com.lixuchun.crud.service 包

EmployeeService

package com.lixuchun.crud.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.lixuchun.crud.bean.Employee;
import com.lixuchun.crud.dao.EmployeeMapper;

@Service
public class EmployeeService {
    
    @Autowired
    EmployeeMapper employeeMapper;
    
    public List<Employee> getAll() {
        return employeeMapper.selectByExampleWithDept(null);
    }
}

建立com.lixuchun.crud.controller 包

EmployeeController

package com.lixuchun.crud.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.lixuchun.crud.bean.Employee;
import com.lixuchun.crud.bean.Message;
import com.lixuchun.crud.service.EmployeeService;

/**
 * 員工處理
 * @author UPC
 *
 */
@Controller
public class EmployeeController {
    
    @Autowired
    EmployeeService employeeService;
    
    
    @RequestMapping("/emps")
    public String getEmployees(@RequestParam(value="pn", defaultValue="1") Integer pn, Model model) {
        // 不是一個分頁查詢
        // 引入分頁插件 pageNum, pageSize
        PageHelper.startPage(pn, 5);
        // startPage 後緊跟這個查詢就是分頁查詢
        List<Employee> emps = employeeService.getAll();
        
        // 使用pageInfo包裝查詢後的結果， 講pageinfo交給頁面就ok
        // 封裝了詳細的分頁信息 包括咱們查詢出來的數據
        // 5爲連續顯示頁數
        PageInfo pageInfo = new PageInfo(emps, 5);
        model.addAttribute("pageInfo", pageInfo);
        return "list";
    }
    
//    @RequestMapping("/emps")
//    public String getEmps(@RequestParam(value="pn" ,defaultValue="1")Integer pn, Model model){ //傳入當前頁面，若是沒有傳則默認爲1
//        
//        //引入PageHelper分頁插件
//        //在查詢以前只須要調用,傳入頁碼，以及分頁每一頁的大小
//        PageHelper.startPage(pn, 5);
//        //startPage後面緊跟的這個查詢就是一個分頁查詢 
//        List<Employee> emps =employeeService.getAll();
//        //使用pageInfo包裝查詢後的信息,只須要將pageinfo交給頁面就好了。
//        //封裝了詳細的分頁信息,包括有咱們查詢出來的數據,傳入:連續顯示的頁數
//        PageInfo page=new PageInfo(emps,5); //5表示要連續顯示的頁數
//        model.addAttribute("pageInfo",page);         
//        return "list";
//    }
    
    /**
     * ResponseBody 使用須要jackson包
     * @param pn
     * @param model
     * @return
     */
    @RequestMapping("/empsWithJson")
    @ResponseBody
    public Message getEmpsWithJson(
            @RequestParam(value="pn" ,defaultValue="1")Integer pn, Model model) {
        //引入PageHelper分頁插件
        //在查詢以前只須要調用,傳入頁碼，以及分頁每一頁的大小
        PageHelper.startPage(pn, 5);
        //startPage後面緊跟的這個查詢就是一個分頁查詢 
        List<Employee> emps =employeeService.getAll();
        //使用pageInfo包裝查詢後的信息,只須要將pageinfo交給頁面就好了。
        //封裝了詳細的分頁信息,包括有咱們查詢出來的數據,傳入:連續顯示的頁數
        PageInfo page=new PageInfo(emps,5); //5表示要連續顯示的頁數
        return Message.success().add("pageInfo", page);
    }
}

在webapp下引入bootstrap插件包，在WEB-INF 下建立view目錄建立list.jsp頁面而且引用bootstrap插件

目錄結構爲：

list.jsp 文件之有顯示分頁功能其他沒有寫後續可能會完善

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib uri="http://java.sun.com/jsp/jstl/core"  prefix="c"%> 
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>員工列表</title>
<%
    pageContext.setAttribute("APP_PATH", request.getContextPath());
%>
<link href="${APP_PATH}/static/bootstrap-3.3.7-dist/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
    <!-- 展現頁面 -->
    <div class="container">
    
        <!-- 標題 -->
        <div class="row">
            <div class="col-md-12">
                <h1>SSM-CRUD</h1>
            </div>
        </div>
        
        <!-- 按鈕 -->
        <div class="row">
            <div class="col-md-4 col-md-offset-8">
                <button class="btn btn-primary">新增</button>
                <button class="btn btn-danger">刪除</button>
            </div>
        </div>
        <!-- 表格 -->
        <div class="row">
            <div class="col-md-12">
                <table class="table table-hover">
                    <tr>
                        <th>#</th>
                        <th>empName</th>
                        <th>gender</th>
                        <th>email</th>
                        <th>deptName</th>
                        <th>操做</th>
                    </tr>
                    <c:forEach items="${pageInfo.list}" var="emp">
                        <tr>
                            <th>${emp.empId}</th>
                            <th>${emp.empName}</th>
                            <th>${emp.gender=="M"?"男":"女"}</th>
                            <!-- M則顯示男，不然顯示女 -->
                            <th>${emp.email}</th>
                            <th>${emp.department.deptName}</th>
                            <th>
                                <button class="btn btn-primary btn-sm">
                                    <span class="glyphicon glyph icon-pencil"></span> 編輯
                                </button>
                                <button class="btn btn-danger btn-sm">
                                    <span class="glyphicon glyphicon-trash"></span> 刪除
                                </button>
                            </th>
                        </tr>
                    </c:forEach>
                </table>
            </div>
        </div>
        
        <!-- 分頁組件 -->
        <div class="row">
            <!-- 分頁信息 -->
            <div class="col-md-6">
                當前${pageInfo.pageNum}頁, 總${pageInfo.pages }頁, 總共${pageInfo.total}條數據
            </div >
            <!-- 分頁條信息 -->
            <div class="col-md-6">
                <nav aria-label="Page navigation">
                  <ul class="pagination">
                      <li><a href="${APP_PATH }/emps?pn=1">首頁</a></li>
                    <c:if test="${pageInfo.hasPreviousPage}">
                        <li>
                          <a href="${APP_PATH }/emps?pn=${pageInfo.pageNum - 1}" aria-label="Previous">
                            <span aria-hidden="true">&laquo;</span>
                          </a>
                        </li>
                    </c:if>
                    <c:forEach items="${pageInfo.navigatepageNums }" var="page_Num">
                        <c:if test="${page_Num == pageInfo.pageNum }">
                            <li class="active"><a href="#">${page_Num}</a></li>
                        </c:if>
                        <c:if test="${page_Num != pageInfo.pageNum }">
                            <li><a href="${APP_PATH }/emps?pn=${page_Num}">${page_Num}</a></li>
                        </c:if>
                    </c:forEach>
                    <c:if test="${pageInfo.hasNextPage}">
                        <li>
                          <a href="${APP_PATH }/emps?pn=${pageInfo.pageNum + 1}" aria-label="Next">
                            <span aria-hidden="true">&raquo;</span>
                          </a>
                        </li>
                    </c:if>
                    <li><a href="${APP_PATH }/emps?pn=${pageInfo.pages}">末頁</a></li>
                  </ul>
                </nav>
            </div>
        </div>
    </div>

<script src="${APP_PATH}/static/bootstrap-3.3.7-dist/js/jquery-3.1.1.min.js"></script>
<script src="${APP_PATH}/static/bootstrap-3.3.7-dist/js/bootstrap.min.js"></script>
</body>
</html>

mybatis提供反向工程自動生成mapper.xml功能

參考 http://www.mybatis.org/generator/configreference/xmlconfig.html

在 /ssm-crud/目錄下建立 MybatisGeneration.xml 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>

      <context id="DB2Tables" targetRuntime="MyBatis3">
    <!-- 去除註釋 -->
    <commentGenerator>
      <property name="suppressAllComments" value="true" />
    </commentGenerator>
  
  
    <!-- 配置數據庫鏈接 -->
    <jdbcConnection driverClass="com.mysql.jdbc.Driver"
        connectionURL="jdbc:mysql://localhost:3306/ssm" userId="root" password="101022">
    </jdbcConnection>

    <javaTypeResolver >
      <property name="forceBigDecimals" value="false" />
    </javaTypeResolver>

 
    <!-- 指定javabean生成的位置 -->
    <javaModelGenerator targetPackage= "com.lixuchun.crud.bean" targetProject=".\src\main\java">
      <property name="enableSubPackages" value="true" />
      <property name="trimStrings" value="true" />
    </javaModelGenerator>



    <!-- 指定sql映射文件的生成位置  -->
    <sqlMapGenerator targetPackage="mapper" targetProject=".\src\main\resources">
      <property name="enableSubPackages" value="true" />
    </sqlMapGenerator>


      <!-- 指定dao接口生成的位置,mapper接口 -->
    <javaClientGenerator type="XMLMAPPER" targetPackage="com.lixuchun.crud.dao" targetProject=".\src\main\java" > 
      <property name="enableSubPackages" value="true" />
    </javaClientGenerator>

    <!-- 指定每一個表的生成策略  -->
    <table tableName="tbl_emp" domainObjectName="Employee"></table>
    <table tableName="tbl_dept" domainObjectName="Department"></table>
</context>
   
</generatorConfiguration>

建立 /ssm-crud/src/main/java/com/lixuchun/crud/test/MybatisGenerator.java

package com.lixuchun.crud.test;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

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;

public class MybatisGenerator {
    public static void main(String[] args) throws Exception {
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("MybatisGeneration.xml");
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(configFile);
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
        myBatisGenerator.generate(null);
    }
}