主題：Mybatis3.0查詢，保存，更新，刪除數據。

近來打算開發一個技術框架，並應用此框架開發出一個論壇，開始打算用sturts2+spring+hibernate+jquery爲基礎，然後再進行封裝，最後形成技術框架，但通過此網站獲知mybatis比hibernate更靈活，實用。因此開始逐步接觸mybatis。

以下是mybatis3.0的開發實例，使用的java環境jdk5.0，ide爲eclipse3.7，數據庫是oracle11g。

1.數據環境配置

Xml代碼  

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "mybatis-3-config.dtd">

<configuration>
<!-- - - - - - - 數據庫環境配置- - - - - - - - - -->
<environments default="environments">
<environment id="eassen">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="oracle.jdbc.driver.OracleDriver"/>
<property name="url" value="jdbc:oracle:thin:@127.0.0.1:1521:eassen"/>
<property name="username" value="eassen"/>
<property name="password" value="oracle"/>
</dataSource>
</environment>
</environments>
<!-- - - - - - - -映射文件路徑- - - - - - -->
<mappers>
<mapper resource="com/pojo/sql/DmMydwtMapper.xml"/>
</mappers>
</configuration>

Xml代碼  

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "mybatis-3-config.dtd">

<configuration>
    <!-- - - - - - - 數據庫環境配置- - - - - - - - - -->
    <environments default="environments">
        <environment id="eassen">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="oracle.jdbc.driver.OracleDriver"/>
                <property name="url" value="jdbc:oracle:thin:@127.0.0.1:1521:eassen"/>
                <property name="username" value="eassen"/>
                <property name="password" value="oracle"/>
            </dataSource>
        </environment>
    </environments>
    <!-- - - - - - - -映射文件路徑- - - - - - -->
    <mappers>
        <mapper resource="com/pojo/sql/DmMydwtMapper.xml"/>
    </mappers>
</configuration>

2.數據庫表映射（DM_MYDWT）XML文件

Xml代碼  

<?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.dao.DmMydwtMapper">
<resultMap id="BaseResultMap" type="com.pojo.DmMydwt">
<id column="MYDWT_DM" property="mydwtDm" jdbcType="CHAR" javaType="String" />
<result column="MYDWT_MC" property="mydwtMc" jdbcType="VARCHAR"
javaType="String" />
<result column="YXBZ" property="yxbz" jdbcType="CHAR" javaType="String" />
<result column="XYBZ" property="xybz" jdbcType="CHAR" javaType="String" />
</resultMap>
<sql id="Base_Column_List">
MYDWT_DM, MYDWT_MC, YXBZ, XYBZ
</sql>
<select id="selectByPrimaryKey" resultMap="BaseResultMap"
parameterType="java.lang.String">
select
<include refid="Base_Column_List" />
from EASSEN.DM_MYDWT
where MYDWT_DM = #{mydwtDm,jdbcType=CHAR}
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.String"
flushCache="true">
delete from EASSEN.DM_MYDWT
where MYDWT_DM =
#{mydwtDm,jdbcType=CHAR}
</delete>
<insert id="insert" parameterType="com.pojo.DmMydwt" flushCache="true">
insert into EASSEN.DM_MYDWT (MYDWT_DM, MYDWT_MC, YXBZ,
XYBZ)
values
(#{mydwtDm,jdbcType=CHAR}, #{mydwtMc,jdbcType=VARCHAR},
#{yxbz,jdbcType=CHAR},
#{xybz,jdbcType=CHAR})
</insert>
<insert id="insertSelective" parameterType="com.pojo.DmMydwt"
flushCache="true">
insert into EASSEN.DM_MYDWT
<trim prefix="(" suffix=")" suffixOverrides=",">
MYDWT_DM,
MYDWT_MC,
YXBZ,
XYBZ,
</trim>
<trim prefix="values (" suffix=")" suffixOverrides=",">
#{mydwtDm,jdbcType=CHAR},
#{mydwtMc},
#{yxbz,jdbcType=CHAR},
#{xybz,jdbcType=CHAR},
</trim>
</insert>
<update id="updateByPrimaryKeySelective" parameterType="com.pojo.DmMydwt"
flushCache="true">
update EASSEN.DM_MYDWT
<set>
<if test="mydwtMc != null">
MYDWT_MC = #{mydwtMc,jdbcType=VARCHAR},
</if>
<if test="yxbz != null">
YXBZ = #{yxbz,jdbcType=CHAR},
</if>
<if test="xybz != null">
XYBZ = #{xybz,jdbcType=CHAR},
</if>
</set>
where MYDWT_DM = #{mydwtDm,jdbcType=CHAR}
</update>
<update id="updateByPrimaryKey" parameterType="com.pojo.DmMydwt"
flushCache="true">
update EASSEN.DM_MYDWT
set MYDWT_MC =
#{mydwtMc,jdbcType=VARCHAR},
YXBZ = #{yxbz,jdbcType=CHAR},
XYBZ =
#{xybz,jdbcType=CHAR}
where MYDWT_DM = #{mydwtDm,jdbcType=CHAR}
</update>
</mapper>

Xml代碼  

<?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.dao.DmMydwtMapper">
    <resultMap id="BaseResultMap" type="com.pojo.DmMydwt">
        <id column="MYDWT_DM" property="mydwtDm" jdbcType="CHAR" javaType="String" />
        <result column="MYDWT_MC" property="mydwtMc" jdbcType="VARCHAR"
            javaType="String" />
        <result column="YXBZ" property="yxbz" jdbcType="CHAR" javaType="String" />
        <result column="XYBZ" property="xybz" jdbcType="CHAR" javaType="String" />
    </resultMap>
    <sql id="Base_Column_List">
        MYDWT_DM, MYDWT_MC, YXBZ, XYBZ
    </sql>
    <select id="selectByPrimaryKey" resultMap="BaseResultMap"
        parameterType="java.lang.String">
        select
        <include refid="Base_Column_List" />
        from EASSEN.DM_MYDWT
        where MYDWT_DM = #{mydwtDm,jdbcType=CHAR}
    </select>
    <delete id="deleteByPrimaryKey" parameterType="java.lang.String"
        flushCache="true">
        delete from EASSEN.DM_MYDWT
        where MYDWT_DM =
        #{mydwtDm,jdbcType=CHAR}
    </delete>
    <insert id="insert" parameterType="com.pojo.DmMydwt" flushCache="true">
        insert into EASSEN.DM_MYDWT (MYDWT_DM, MYDWT_MC, YXBZ,
        XYBZ)
        values
        (#{mydwtDm,jdbcType=CHAR}, #{mydwtMc,jdbcType=VARCHAR},
        #{yxbz,jdbcType=CHAR},
        #{xybz,jdbcType=CHAR})
    </insert>
    <insert id="insertSelective" parameterType="com.pojo.DmMydwt"
        flushCache="true">
        insert into EASSEN.DM_MYDWT
        <trim prefix="(" suffix=")" suffixOverrides=",">
            MYDWT_DM,
            MYDWT_MC,
            YXBZ,
            XYBZ,
        </trim>
        <trim prefix="values (" suffix=")" suffixOverrides=",">
            #{mydwtDm,jdbcType=CHAR},
            #{mydwtMc},
            #{yxbz,jdbcType=CHAR},
            #{xybz,jdbcType=CHAR},
        </trim>
    </insert>
    <update id="updateByPrimaryKeySelective" parameterType="com.pojo.DmMydwt"
        flushCache="true">
        update EASSEN.DM_MYDWT
        <set>
            <if test="mydwtMc != null">
                MYDWT_MC = #{mydwtMc,jdbcType=VARCHAR},
            </if>
            <if test="yxbz != null">
                YXBZ = #{yxbz,jdbcType=CHAR},
            </if>
            <if test="xybz != null">
                XYBZ = #{xybz,jdbcType=CHAR},
            </if>
        </set>
        where MYDWT_DM = #{mydwtDm,jdbcType=CHAR}
    </update>
    <update id="updateByPrimaryKey" parameterType="com.pojo.DmMydwt"
        flushCache="true">
        update EASSEN.DM_MYDWT
        set MYDWT_MC =
        #{mydwtMc,jdbcType=VARCHAR},
        YXBZ = #{yxbz,jdbcType=CHAR},
        XYBZ =
        #{xybz,jdbcType=CHAR}
        where MYDWT_DM = #{mydwtDm,jdbcType=CHAR}
    </update>
</mapper>

3.數據庫表（DM_MYDWT）java

Java代碼  

package com.pojo;

import java.io.Serializable;

public class DmMydwt implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1078518054837885063L;

/**
* EASSEN.DM_MYDWT.MYDWT_DM
* @ibatorgenerated 2012-02-05 20:14:30
*/
private String mydwtDm;

/**
* EASSEN.DM_MYDWT.MYDWT_MC
* @ibatorgenerated 2012-02-05 20:14:30
*/
private String mydwtMc;

/**
* EASSEN.DM_MYDWT.YXBZ
* @ibatorgenerated 2012-02-05 20:14:30
*/
private String yxbz;

/**
* EASSEN.DM_MYDWT.XYBZ
* @ibatorgenerated 2012-02-05 20:14:30
*/
private String xybz;

public String getMydwtDm() {
return mydwtDm;
}

public void setMydwtDm(String mydwtDm) {
this.mydwtDm = mydwtDm;
}

public String getMydwtMc() {
return mydwtMc;
}

public void setMydwtMc(String mydwtMc) {
this.mydwtMc = mydwtMc;
}

public String getYxbz() {
return yxbz;
}

public void setYxbz(String yxbz) {
this.yxbz = yxbz;
}

public String getXybz() {
return xybz;
}

public void setXybz(String xybz) {
this.xybz = xybz;
}
}

Java代碼  

package com.pojo;

import java.io.Serializable;

public class DmMydwt implements Serializable {
    /**
     *
     */
    private static final long serialVersionUID = 1078518054837885063L;

    /**
     * EASSEN.DM_MYDWT.MYDWT_DM
     * @ibatorgenerated 2012-02-05 20:14:30
     */
    private String mydwtDm;

    /**
     * EASSEN.DM_MYDWT.MYDWT_MC
     * @ibatorgenerated 2012-02-05 20:14:30
     */
    private String mydwtMc;

    /**
     * EASSEN.DM_MYDWT.YXBZ
     * @ibatorgenerated 2012-02-05 20:14:30
     */
    private String yxbz;

    /**
     * EASSEN.DM_MYDWT.XYBZ
     * @ibatorgenerated 2012-02-05 20:14:30
     */
    private String xybz;

    public String getMydwtDm() {
        return mydwtDm;
    }

    public void setMydwtDm(String mydwtDm) {
        this.mydwtDm = mydwtDm;
    }

    public String getMydwtMc() {
        return mydwtMc;
    }

    public void setMydwtMc(String mydwtMc) {
        this.mydwtMc = mydwtMc;
    }

    public String getYxbz() {
        return yxbz;
    }

    public void setYxbz(String yxbz) {
        this.yxbz = yxbz;
    }

    public String getXybz() {
        return xybz;
    }

    public void setXybz(String xybz) {
        this.xybz = xybz;
    }
}

 

4.DAO

Java代碼  

package com.dao;

import com.pojo.DmMydwt;

public interface DmMydwtMapper {
/**
* 根據主鍵刪除
* 參數:主鍵
* 返回:刪除個數
* @ibatorgenerated 2012-02-05 20:14:58
*/
int deleteByPrimaryKey(String mydwtDm);

/**
* 插入，空屬性也會插入
* 參數:pojo對象
* 返回:刪除個數
* @ibatorgenerated 2012-02-05 20:14:58
*/
int insert(DmMydwt record);

/**
* 插入，空屬性不會插入
* 參數:pojo對象
* 返回:刪除個數
* @ibatorgenerated 2012-02-05 20:14:58
*/
int insertSelective(DmMydwt record);

/**
* 根據主鍵查詢
* 參數:查詢條件,主鍵值
* 返回:對象
* @ibatorgenerated 2012-02-05 20:14:58
*/
DmMydwt selectByPrimaryKey(String mydwtDm);

/**
* 根據主鍵修改，空值條件不會修改成null
* 參數:1.要修改成的值
* 返回:成功修改個數
* @ibatorgenerated 2012-02-05 20:14:58
*/
int updateByPrimaryKeySelective(DmMydwt record);

/**
* 根據主鍵修改，空值條件會修改成null
* 參數:1.要修改成的值
* 返回:成功修改個數
* @ibatorgenerated 2012-02-05 20:14:58
*/
int updateByPrimaryKey(DmMydwt record);
}

Java代碼  

package com.dao;

import com.pojo.DmMydwt;

public interface DmMydwtMapper {
    /**
     * 根據主鍵刪除
     * 參數:主鍵
     * 返回:刪除個數
     * @ibatorgenerated 2012-02-05 20:14:58
     */
    int deleteByPrimaryKey(String mydwtDm);

    /**
     * 插入，空屬性也會插入
     * 參數:pojo對象
     * 返回:刪除個數
     * @ibatorgenerated 2012-02-05 20:14:58
     */
    int insert(DmMydwt record);

    /**
     * 插入，空屬性不會插入
     * 參數:pojo對象
     * 返回:刪除個數
     * @ibatorgenerated 2012-02-05 20:14:58
     */
    int insertSelective(DmMydwt record);

    /**
     * 根據主鍵查詢
     * 參數:查詢條件,主鍵值
     * 返回:對象
     * @ibatorgenerated 2012-02-05 20:14:58
     */
    DmMydwt selectByPrimaryKey(String mydwtDm);

    /**
     * 根據主鍵修改，空值條件不會修改成null
     * 參數:1.要修改成的值
     * 返回:成功修改個數
     * @ibatorgenerated 2012-02-05 20:14:58
     */
    int updateByPrimaryKeySelective(DmMydwt record);

    /**
     * 根據主鍵修改，空值條件會修改成null
     * 參數:1.要修改成的值
     * 返回:成功修改個數
     * @ibatorgenerated 2012-02-05 20:14:58
     */
    int updateByPrimaryKey(DmMydwt record);
}

 

5.mybatis加載

Java代碼  

package com.db;

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;

public class ConnectionFactory {
private static SqlSessionFactory factory;
private static SqlSession sqlSession = null;


// 讀取MyBatis配置文件，創建SqlSessionFactory
static {
try {
Reader reader = Resources.getResourceAsReader("sqlMapConfig.xml");
factory = new SqlSessionFactoryBuilder().build(reader, "eassen");
} catch (IOException e) {
e.printStackTrace();
}
}

/**
* 獲取SqlSession
* @return
*/
public static SqlSession getSession() {
if(sqlSession == null){
sqlSession = factory.openSession();
}
return sqlSession;
}

/**
* 從配置文件中獲取數據庫表映射對象信息
* @param mapper
* @return
*/
public static <T> T getMapper(Class<T> mapper) {
SqlSession session = getSession();
return (T) session.getMapper(mapper);
}

/**
* 數據提交
*/
public static void commit(){
sqlSession.commit();
}
/**
* 數據回滾
*/
public static void rollback(){
sqlSession.rollback();
}
/**
* 關閉sqlsession
*/
public static void close(){
if(sqlSession != null){
sqlSession.close();
}
}


}

Java代碼  

package com.db;

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;

public class ConnectionFactory {
    private static SqlSessionFactory factory;
    private static SqlSession sqlSession = null;


    // 讀取MyBatis配置文件，創建SqlSessionFactory
    static {
        try {
            Reader reader = Resources.getResourceAsReader("sqlMapConfig.xml");
            factory = new SqlSessionFactoryBuilder().build(reader, "eassen");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 獲取SqlSession
     * @return
     */
    public static SqlSession getSession() {
        if(sqlSession == null){
            sqlSession = factory.openSession();
        }
        return sqlSession;
    }

    /**
     * 從配置文件中獲取數據庫表映射對象信息
     * @param mapper
     * @return
     */
    public static <T> T getMapper(Class<T> mapper) {
        SqlSession session = getSession();
        return (T) session.getMapper(mapper);
    }

    /**
     * 數據提交
     */
    public static void commit(){
        sqlSession.commit();
    }
    /**
     * 數據回滾
     */
    public static void rollback(){
        sqlSession.rollback();
    }
    /**
     * 關閉sqlsession
     */
    public static void close(){
        if(sqlSession != null){
            sqlSession.close();
        }
    }


}

6.數據查詢，插入，更新，刪除測試

Java代碼  

package com.test;

import com.dao.DmMydwtMapper;
import com.db.ConnectionFactory;
import com.pojo.DmMydwt;

public class MydTest {

public static void main(String[] args) {
try {
// 獲取對象
DmMydwtMapper mydwtMapper = ConnectionFactory
.getMapper(com.dao.DmMydwtMapper.class);

// 查詢相關MYDWT_DM爲“1001”的信息
DmMydwt mydwt = mydwtMapper.selectByPrimaryKey("1001");
System.out.println("mybatis查詢測試：=================================");
System.out.println("MYDWT_DM：" + mydwt.getMydwtDm());
System.out.println("MYDWT_MC：" + mydwt.getMydwtMc());

// 插入數據
System.out.println("mybatis保存測試：=================================");
mydwt = new DmMydwt();
mydwt.setMydwtDm("aaaa");
mydwt.setMydwtMc("mybatis保存");
mydwt.setYxbz("Y");
mydwt.setXybz("Y");
mydwtMapper.insert(mydwt);
// 更新數據
System.out.println("mybatis更新測試：=================================");
mydwt.setMydwtMc(new String("mybatis保存".getBytes(),"UTF-8"));
mydwtMapper.updateByPrimaryKey(mydwt);

// 刪除數據
System.out.println("mybatis刪除測試：=================================");
mydwtMapper.deleteByPrimaryKey("1001");
ConnectionFactory.commit();
} catch (Exception e) {
ConnectionFactory.rollback();
e.printStackTrace();
} finally {
// 關閉sqlsession
ConnectionFactory.close();
}
}
}

Java代碼  

package com.test;

import com.dao.DmMydwtMapper;
import com.db.ConnectionFactory;
import com.pojo.DmMydwt;

public class MydTest {

    public static void main(String[] args) {
        try {
            // 獲取對象
            DmMydwtMapper mydwtMapper = ConnectionFactory
                    .getMapper(com.dao.DmMydwtMapper.class);

            // 查詢相關MYDWT_DM爲“1001”的信息
            DmMydwt mydwt = mydwtMapper.selectByPrimaryKey("1001");
            System.out.println("mybatis查詢測試：=================================");
            System.out.println("MYDWT_DM：" + mydwt.getMydwtDm());
            System.out.println("MYDWT_MC：" + mydwt.getMydwtMc());

            // 插入數據
            System.out.println("mybatis保存測試：=================================");
            mydwt = new DmMydwt();
            mydwt.setMydwtDm("aaaa");
            mydwt.setMydwtMc("mybatis保存");
            mydwt.setYxbz("Y");
            mydwt.setXybz("Y");
            mydwtMapper.insert(mydwt);
            // 更新數據
            System.out.println("mybatis更新測試：=================================");
            mydwt.setMydwtMc(new String("mybatis保存".getBytes(),"UTF-8"));
            mydwtMapper.updateByPrimaryKey(mydwt);

            // 刪除數據
            System.out.println("mybatis刪除測試：=================================");
            mydwtMapper.deleteByPrimaryKey("1001");
            ConnectionFactory.commit();
        } catch (Exception e) {
            ConnectionFactory.rollback();
            e.printStackTrace();
        } finally {
            // 關閉sqlsession
            ConnectionFactory.close();
        }
    }
}

7.控制檯信息輸出

Java代碼  

2012-02-08 11:43:01 Logging initialized using 'org.apache.ibatis.logging.commons.JakartaCommonsLoggingImpl'adapter.
2012-02-08 11:43:01 PooledDataSource forcefully closed/removed all connections.
2012-02-08 11:43:01 PooledDataSource forcefully closed/removed all connections.
2012-02-08 11:43:01 PooledDataSource forcefully closed/removed all connections.
2012-02-08 11:43:01 PooledDataSource forcefully closed/removed all connections.
2012-02-08 11:43:02 Created connection 17671659.
2012-02-08 11:43:02 ooo Connection Opened
2012-02-08 11:43:02 ==> Executing: select MYDWT_DM, MYDWT_MC, YXBZ, XYBZ from EASSEN.DM_MYDWT where MYDWT_DM = ?
2012-02-08 11:43:02 ==> Parameters: 1001(String)
2012-02-08 11:43:02 <== Columns: MYDWT_DM, MYDWT_MC, YXBZ, XYBZ
2012-02-08 11:43:02 <== Row: 1001, 您經常訪問的網站包括：, Y, Y
mybatis查詢測試：=================================
MYDWT_DM：1001
MYDWT_MC：您經常訪問的網站包括：
mybatis保存測試：=================================
2012-02-08 11:43:02 ==> Executing: insert into EASSEN.DM_MYDWT (MYDWT_DM, MYDWT_MC, YXBZ, XYBZ) values (?, ?, ?, ?)
2012-02-08 11:43:02 ==> Parameters: aaaa(String), mybatis保存(String), Y(String), Y(String)
mybatis更新測試：=================================
2012-02-08 11:43:02 ==> Executing: update EASSEN.DM_MYDWT set MYDWT_MC = ?, YXBZ = ?, XYBZ = ? where MYDWT_DM = ?
2012-02-08 11:43:02 ==> Parameters: mybatis保存(String), Y(String), Y(String), aaaa(String)
mybatis刪除測試：=================================
2012-02-08 11:43:02 ==> Executing: delete from EASSEN.DM_MYDWT where MYDWT_DM = ?
2012-02-08 11:43:02 ==> Parameters: 1001(String)
2012-02-08 11:43:02 xxx Connection Closed
2012-02-08 11:43:02 Returned connection 17671659 to pool.