mybatis中的增删改查操作
2024-08-27 12:50:51
在这一个部分,主要进行增删改查的示例书写。
增删改查可以基于xml的,也可以基于注解的方式。
一:对单条数据的查询
1.目录结构
这个使得目录更加清晰
2.User.java
这个使用以前的user表。
因此,domain不需要改动。
3.配置文件
重要的参考部分是引用映射文件的部分
<?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>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC">
<property name="" value=""/>
</transactionManager>
<dataSource type="UNPOOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://127.0.0.1:3308/mybatis"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</dataSource>
</environment>
</environments> <mappers>
<mapper resource="com/cao/sql/config/users.xml"/>
</mappers> </configuration>
4.映射文件
<?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="quickFirst">
<resultMap type="com.cao.bean.User" id="User">
<id column="ID" jdbcType="INTEGER" property="id"/>
<result column="NAME" jdbcType="VARCHAR" property="name"/>
<result column="AGE" jdbcType="INTEGER" property="age"/>
</resultMap>
<!-- 单条数据的查询,根据id查询 -->
<select id="selectUserOne" parameterType="int" resultMap="User">
SELECT * From users where id = #{id};
</select>
</mapper>
5.测试类
这个对于加载的配置文件的方式不同,稍微有点区别,顺便整理一下。
package com.cao.test1; import java.io.IOException;
import java.io.InputStream;
import java.io.Reader; 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 org.junit.Test; import com.cao.bean.User;
/**
* 这是一个对比程序
* 当然也是一个根据条件,进行单条查询的程序
* @author dell
*
*/
public class mainTest {
/**
* 查询单条数据
* 根据id进行查询
* @throws Exception
*/
@Test
public void testSelectOne1() throws Exception {
String resources="/com/cao/config/Configuration.xml"; //这种方式在前面需要加一个/
InputStream is=mainTest.class.getResourceAsStream(resources);
SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(is);
SqlSession sqlSession=sqlSessionFactory.openSession();
String statement="quickFirst.selectUserOne";
User user=sqlSession.selectOne(statement, 1);
System.out.println(user);
}
@Test
public void testSelectOne2() throws Exception { ////这种方式在前面不需要添加
Reader reader=Resources.getResourceAsReader("com/cao/config/Configuration.xml");
SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(reader);
SqlSession sqlSession=sqlSessionFactory.openSession();
String statement="quickFirst.selectUserOne";
User user=sqlSession.selectOne(statement, 2);
System.out.println(user);
}
}
二:插入数据
1.xml
<!-- 插入数据 -->
<insert id="insertData" parameterType="com.cao.bean.User">
INSERT INTO USERS(name,age) value(#{name},#{age});
</insert>
2.测试程序
/**
* 插入数据
*/
@Test
public void testInsert()throws Exception {
Reader reader=Resources.getResourceAsReader("com/cao/config/Configuration.xml");
SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(reader);
SqlSession sqlSession=sqlSessionFactory.openSession();
String statement="quickFirst.insertData";
int insert=sqlSession.insert(statement, new User(-1,"KK",9));
sqlSession.commit();
System.out.println(insert);
sqlSession.close();
}
3.效果
打印出1,表示插入一条数据。
数据库:
三:删除数据
1.xml
<!-- 删除数据 -->
<delete id="deleteData" parameterType="int">
DELETE FROM USERS where id=#{id};
</delete>
2.测试程序
/**
* 删除数据
*/
@Test
public void testDelete()throws Exception {
Reader reader=Resources.getResourceAsReader("com/cao/config/Configuration.xml");
SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(reader);
SqlSession sqlSession=sqlSessionFactory.openSession();
String statement="quickFirst.deleteData";
int delete=sqlSession.delete(statement, 4);
System.out.println(delete);
sqlSession.commit();
sqlSession.close();
}
3.效果
打印出1,表示删除一条数据。
数据库:
四:更新数据
1.xml
<!-- 更新数据 -->
<update id="updateData" parameterType="com.cao.bean.User">
UPDATE USERS set name=#{name},age=#{age} where id=#{id};
</update>
2.测试类
/**
* 更新数据
*/
@Test
public void testUpdate()throws Exception{
Reader reader=Resources.getResourceAsReader("com/cao/config/Configuration.xml");
SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(reader);
SqlSession sqlSession=sqlSessionFactory.openSession();
String statement="quickFirst.updateData";
int update=sqlSession.update(statement, new User(3,"TT",99));
sqlSession.commit();
System.out.println(update);
sqlSession.close(); }
3.效果
打印1,表示更新一条数据。
数据库:
、
五:完整程序
1.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="quickFirst">
<resultMap type="com.cao.bean.User" id="User">
<id column="ID" jdbcType="INTEGER" property="id"/>
<result column="NAME" jdbcType="VARCHAR" property="name"/>
<result column="AGE" jdbcType="INTEGER" property="age"/>
</resultMap> <!-- 单条数据的查询,根据id查询 -->
<select id="selectUserOne" parameterType="int" resultMap="User">
SELECT * From users where id = #{id};
</select> <!-- 插入数据 -->
<insert id="insertData" parameterType="com.cao.bean.User">
INSERT INTO USERS(name,age) value(#{name},#{age});
</insert> <!-- 删除数据 -->
<delete id="deleteData" parameterType="int">
DELETE FROM USERS where id=#{id};
</delete> <!-- 更新数据 -->
<update id="updateData" parameterType="com.cao.bean.User">
UPDATE USERS set name=#{name},age=#{age} where id=#{id};
</update>
</mapper>
2.测试类
package com.cao.test1; import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.sql.Connection; import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ExecutorType;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.apache.ibatis.session.TransactionIsolationLevel;
import org.junit.Test; import com.cao.bean.User;
/**
* 这是一个对比程序
* 当然也是一个根据条件,进行单条查询的程序
* @author dell
*
*/
public class mainTest {
/**
* 查询单条数据
* 根据id进行查询
* @throws Exception
*/
@Test
public void testSelectOne1() throws Exception {
String resources="/com/cao/config/Configuration.xml"; //这种方式在前面需要加一个/
InputStream is=mainTest.class.getResourceAsStream(resources);
SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(is);
SqlSession sqlSession=sqlSessionFactory.openSession();
String statement="quickFirst.selectUserOne";
User user=sqlSession.selectOne(statement, 1);
System.out.println(user);
}
@Test
public void testSelectOne2() throws Exception { ////这种方式在前面不需要添加
Reader reader=Resources.getResourceAsReader("com/cao/config/Configuration.xml");
SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(reader);
SqlSession sqlSession=sqlSessionFactory.openSession();
String statement="quickFirst.selectUserOne";
User user=sqlSession.selectOne(statement, 2);
System.out.println(user);
}
/**
* 插入数据
*/
@Test
public void testInsert()throws Exception {
Reader reader=Resources.getResourceAsReader("com/cao/config/Configuration.xml");
SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(reader);
SqlSession sqlSession=sqlSessionFactory.openSession();
String statement="quickFirst.insertData";
int insert=sqlSession.insert(statement, new User(-1,"KK",9));
sqlSession.commit();
System.out.println(insert);
sqlSession.close();
}
/**
* 删除数据
*/
@Test
public void testDelete()throws Exception {
Reader reader=Resources.getResourceAsReader("com/cao/config/Configuration.xml");
SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(reader);
SqlSession sqlSession=sqlSessionFactory.openSession();
String statement="quickFirst.deleteData";
int delete=sqlSession.delete(statement, 4);
System.out.println(delete);
sqlSession.commit();
sqlSession.close();
}
/**
* 更新数据
*/
@Test
public void testUpdate()throws Exception{
Reader reader=Resources.getResourceAsReader("com/cao/config/Configuration.xml");
SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(reader);
SqlSession sqlSession=sqlSessionFactory.openSession();
String statement="quickFirst.updateData";
int update=sqlSession.update(statement, new User(3,"TT",99));
sqlSession.commit();
System.out.println(update);
sqlSession.close(); } }
六:基于注解的增删改查
1.目录
2.接口
package com.cao.test1; import java.util.List; import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update; import com.cao.bean.User; public interface UserMapper {
@Insert("INSERT INTO USERS(name,age) value(#{name},#{age})")
public int add(User user); @Delete("DELETE FROM USERS where id=#{id}")
public int delete(int id); @Update("UPDATE USERS set name=#{name},age=#{age} where id=#{id}")
public int update(User user); @Select("SELECT * From users where id = #{id}")
public User selectById(int id); @Select("SELECT * From users")
public List<User> select();
}
3.xml
重要的是需要将接口注册进去
<?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>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC">
<property name="" value=""/>
</transactionManager>
<dataSource type="UNPOOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://127.0.0.1:3308/mybatis"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</dataSource>
</environment>
</environments> <mappers>
<mapper class="com.cao.test1.UserMapper"/>
</mappers> </configuration>
4.测试类
package com.cao.test; import java.io.IOException;
import java.io.Reader; 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 org.junit.Test; import com.cao.bean.User;
import com.cao.test1.UserMapper; public class MainTest {
@Test
public void test1() throws Exception {
Reader reader=Resources.getResourceAsReader("com/cao/config/Configuration.xml");
SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(reader);
SqlSession sqlSession=sqlSessionFactory.openSession(true); //true后是自动提交
UserMapper userMapper=sqlSession.getMapper(UserMapper.class);
int add=userMapper.add(new User(-1,"TT",89));
System.out.println(add);
sqlSession.close();
}
}
5.效果
、
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