mybatis基础学习二

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操作users表的CRUD

XML实现方式

• 定义sql映射xml文件 userMapper.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="mybatis.userMapper"> 
    <!-- <select id="getid" parameterType="int" 
        resultType="mybatis.User">
        select * from users where id=#{id}
    </select> -->
    <insert id="insertUser" parameterType="mybatis.User">
    insert into users(name, age) values(#{name}, #{age});
    </insert>
    <delete id="deleteUser" parameterType="int">
    delete from users where id=#{id}
    </delete>
    <update id="updateUser" parameterType="mybatis.User">
    update users set name=#{name},age=#{age} where id=#{id}
    </update>
    <select id="selectUser" parameterType="int" resultType="mybatis.User">
    select * from users where id=#{id}
    </select>
    <select id="selectAllUsers" resultType="mybatis.User">
    select * from users
    </select>    
</mapper>

• 在conf.xml中注册该映射文件

<?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>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver" />
                <property name="url" value="jdbc:mysql://172.171.2.161:3306/mybatis" />
                <property name="username" value="root" />
                <property name="password" value="root123" />
            </dataSource>
        </environment>
    </environments>
    <mappers>
    <!--xml方式  -->
        <mapper resource="mybatis/userMapper.xml"/>
    </mappers>
</configuration>

• 封装得到session的方法，MybatisUtil.java

package mybatis;
import java.io.InputStream;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
public class MybatisUtil
{
    //返回session
    public static SqlSession openSqlSession()
    {
        String resource = "conf.xml";
        InputStream is = Test.class.getClassLoader().getResourceAsStream(resource);
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);
        SqlSession session = factory.openSession();
        //貌似可有可无
        session.commit();
        return session;
    }
}

• 编写测试类 Test.java

插入用户

package mybatis;
import java.io.IOException;
public class Test
{
    public static void main(final String[] args) throws IOException
    {
        /**
         * xml方式测试
         */
        String statement = "mybatis.userMapper.insertUser";
        int tuser = MybatisUtil.openSqlSession().insert(statement, new User(3, "rose", 3));
        MybatisUtil.openSqlSession().close();
        System.out.println(tuser);
    }
}

更新用户

package mybatis;
import java.io.IOException;
public class Test
{
    public static void main(final String[] args) throws IOException
    {
        /**
         * xml方式测试
         */
        String statement = "mybatis.userMapper.updateUser";
        int tuser = MybatisUtil.openSqlSession().update(statement, new User(3, "rose", 3));
        MybatisUtil.openSqlSession().close();
        System.out.println(tuser);
    }
}

删除用户

package mybatis;
import java.io.IOException;
public class Test
{
    public static void main(final String[] args) throws IOException
    {
        /**
         * xml方式测试
         */
        String statement = "mybatis.userMapper.deleteUser";
        int tuser = MybatisUtil.openSqlSession().delete(statement,2));
        MybatisUtil.openSqlSession().close();
        System.out.println(tuser);
    }
}

查询全部用户

package mybatis;
import java.io.IOException;
public class Test
{
    public static void main(final String[] args) throws IOException
    {
        /**
         * xml方式测试
         */
        String statement = "mybatis.userMapper.selectAllUsers";
        List<User> tuser = MybatisUtil.openSqlSession().selectList(statement);
        MybatisUtil.openSqlSession().close();
        System.out.println(tuser);
    }
}

注解实现方式

• 定义sql接口文件 UserMapperDe.java

package mybatis;
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;
public interface UserMapperDe
{
    @Insert("insert into users(name, age) values(#{name}, #{age})")
    public int insertUser(User user);
    @Delete("delete from users where id=#{id}")
    public int deleteUserById(int id);
    @Update("update users set name=#{name},age=#{age} where id=#{id}")
    public int updateUser(User user);
    @Select("select * from users where id=#{id}")
    public User getUserById(int id);
    @Select("select * from users")
    public List<User> getAllUser();
}

• 在conf.xml中注册该接口文件

<?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>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver" />
                <property name="url" value="jdbc:mysql://172.171.2.161:3306/mybatis" />
                <property name="username" value="root" />
                <property name="password" value="root123" />
            </dataSource>
        </environment>
    </environments>
    <mappers>
    <!--xml方式  -->
        <mapper resource="mybatis/userMapper.xml"/>
        <!--注解方式  -->
        <mapper class="mybatis.UserMapperDe"/>
    </mappers>
</configuration>

• 编写测试类 TestClass.java

插入用户

package mybatis;
import java.io.IOException;
public class Test
{
    public static void main(final String[] args) throws IOException
    {
        /**
         * 注解方式测试
         */
        UserMapperDe mapper = MybatisUtil.openSqlSession().getMapper(UserMapperDe.class);
        int inuser = mapper.insertUser(new User(-1, "clock", 1));
        MybatisUtil.openSqlSession().close();
        System.out.println(inuser);
    }
}

更新用户

package mybatis;
import java.io.IOException;
public class Test
{
    public static void main(final String[] args) throws IOException
    {
        /**
         * 注解方式测试
         */
        UserMapperDe mapper = MybatisUtil.openSqlSession().getMapper(UserMapperDe.class);
        int inuser = mapper.updateUser(new User(2, "efpd", 2));
        MybatisUtil.openSqlSession().close();
        System.out.println(inuser);
    }
}

删除用户

package mybatis;
import java.io.IOException;
public class Test
{
    public static void main(final String[] args) throws IOException
    {
        /**
         * 注解方式测试
         */
        UserMapperDe mapper = MybatisUtil.openSqlSession().getMapper(UserMapperDe.class);
        int inuser = mapper.deleteUserById(2);
        MybatisUtil.openSqlSession().close();
        System.out.println(inuser);
    }
}

查询全部用户

package mybatis;
import java.io.IOException;
public class Test
{
    public static void main(final String[] args) throws IOException
    {
        /**
         * 注解方式测试
         */
        UserMapperDe mapper = MybatisUtil.openSqlSession().getMapper(UserMapperDe.class);
        List<User> inuser = mapper.getAllUser();
        MybatisUtil.openSqlSession().close();
        System.out.println(inuser);
    }
}

mybatis基础学习二

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原文地址：http://www.cnblogs.com/angerze/p/c9214f160f7301c79dbf80af58e6a8bc.html