新建項目選擇web,MyBatis,MySQL三個依賴java
對於已存在的項目能夠在bulid.gradle加入,spring boot將會幫你自動配置好mysql
compile('org.springframework.boot:spring-boot-starter-data-jpa') compile('org.springframework.boot:spring-boot-starter-web') runtime('mysql:mysql-connector-java') testCompile('org.springframework.boot:spring-boot-starter-test')
而後在src/main/resources/application.properties下添加基本配置git
#數據庫鏈接地址 spring.datasource.url=jdbc:mysql://localhost:3306/mybaits?useSSL=false #數據庫帳號 spring.datasource.username=root #數據庫密碼 spring.datasource.password=123456zxc #數據庫驅動 spring.datasource.driver-class-name=com.mysql.jdbc.Driver
建立一個User實體,包含id、name(姓名)、age(年齡)屬性github
public class User { private Long id; private String name; private Integer age; public User() { } public User(String name, Integer age) { this.name = name; this.age = age; } public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } }
建立一個userMapper接口,進行數據庫操做,添加@Mapper註解web
import org.apache.ibatis.annotations.*; import java.util.List; @Mapper//這是一個MyBatis的數據庫操做接口 public interface UserMapper { @Select("SELECT * FROM user WHERE name = #{name}") User findByName(@Param("name") String name); @Select("SELECT * FROM user WHERE name LIKE #{name}") List<User> findByNameLike(@Param("name") String name); @Insert("INSERT INTO user(name, age) VALUES(#{name}, #{age})") int insert(@Param("name") String name, @Param("age") Integer age); @Update("UPDATE user SET age = #{age} WHERE name = #{name}") int update(@Param("name") String name, @Param("age") Integer age); @Delete("DELETE FROM user WHERE name = #{name}") int delete(@Param("name") String name); @Select("SELECT COUNT(*) FROM user") int countAll(); }
在src/test/java/你的包名/你的項目名ApplicationTests編寫對應的單元測試來驗證編寫的內容是否正確spring
import org.junit.Assert; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.annotation.Rollback; import org.springframework.test.context.junit4.SpringRunner; import org.springframework.transaction.annotation.Transactional; @RunWith(SpringRunner.class) @SpringBootTest @Transactional//聲明事務,配合Rollback public class MybatisApplicationTests { @Autowired private UserMapper userMapper; @Test @Rollback//測試結束回滾數據,保證測試單元每次運行的數據環境獨立 public void testUser() { userMapper.insert("QQQ",1); userMapper.insert("WWW",2); userMapper.insert("EEE",3); userMapper.insert("AAA",4); userMapper.insert("SSS",5); userMapper.insert("DDD",6); userMapper.insert("ZZZ",7); userMapper.insert("XXX",8); userMapper.insert("CCC",9); userMapper.insert("SSS213",10); // 測試findAll, 查詢全部記錄 Assert.assertEquals(10, userMapper.countAll()); // 測試findByName, 查詢姓名爲AAA的User Assert.assertEquals(4, userMapper.findByName("AAA").getAge().longValue()); // 更新CCC用戶的年齡爲15 userMapper.update("CCC",15); // 測試findByName, 查詢姓名爲CCC的User的年齡是否爲15 Assert.assertEquals(15, userMapper.findByName("CCC").getAge().longValue()); // 測試刪除姓名爲AAA的User userMapper.delete("AAA"); // 測試findAll, 查詢全部記錄, 驗證上面的刪除是否成功 Assert.assertEquals(9, userMapper.countAll()); // 測試findAll, 查詢名字有S的有幾個 Assert.assertEquals(2,userMapper.findByNameLike("%S%").size()); } }
測試結果sql
源碼地址:https://github.com/LieRabbit/...
原文地址:https://lierabbit.cn/2018/01/...數據庫