MyBatis和Hibernate的使用基本一樣，區別在於Hibernate在Java程式碼中實現資料庫操作，整合度高；Mybatis在註解或者xml檔案中通過配置實現SQL語句，更加靈活

建立使用MyBatis的Java專案

1. 建立並配置

• 配置log4j.properties（用於檢視執行的SQL語句，日誌等）

log4j.rootLogger=DEBUG,Console

log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache
 
.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=%d[%t]%-5p[%c]-%m%n

log4j.logger.java.sql.ResultSet=INFO
log4j.logger.org.apache=INFO
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG

• 配置MyBaits的配置檔案

<?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://localhost/mybatis?useSSL=false" />
                <property name="username" value="root" />
                <property name="password" value="123456" />
            </dataSource>
        </environment>
    </environments>
    <!-- 對映檔案 -->
    <mappers>
        <mapper resource="map/query.xml" />
        <mapper resource="map/insert.xml" />
        <mapper resource="map/update.xml" />
        <mapper resource="map/delete.xml" />
    </mappers>
</configuration>    

2.實現增刪改查操作

• 建立和資料庫表對應的JavaBean
• 建立相應的檔案
• 通過Java中呼叫實現相關操作

//載入配置檔案並初始化
public class InsertTest {
    public static void main(String[] args) {
        String resource = "map/mybatis.xml";

        Reader reader = null;
        SqlSessionFactory factory = null;
        SqlSession session = null;

        try {
            reader = Resources.getResourceAsReader(resource);
            factory = new SqlSessionFactoryBuilder().build(reader);
            session = factory.openSession();

            /**
            *具體功能實現部分
            **/

            session.commit();
        } catch (IOException e) {
            session.rollback();
            e.printStackTrace();
        } finally {
            session.close();
        }

    }
}

• insert.xml

    <!-- 插入新資料 -->
    <!-- 語句的id，傳入的資料型別，語句型別為預編譯語句，主鍵是id，由資料庫處理主鍵值 -->
    <insert id="insert" parameterType="pojo.User" statementType="PREPARED"
        keyProperty="id" useGeneratedKeys="true">
        insert into mybatis(name,password)
        values(#{name},#{password})
    </insert>

• insert實現

    User user = new User(1, "果粒橙", "果粒橙");
    session.insert("insert", user);

• delete.xml

    <!-- 刪除資料 -->
    <delete id="deleteByObject" parameterType="pojo.User">
        delete from mybatis
        where id = #{id}
    </delete>
    <delete id="deleteByID" parameterType="int">
        delete from mybatis where
        id = #{id}
    </delete>

• delete實現

        // 通過物件刪除
        User user = new User();
        user.setId(3);
        session.delete("deleteByObject", user);

        // 通過ID刪除
        session.delete("deleteByID", 2);

• update.xml

    <!-- 更新資料 -->
    <!-- id，插入的資料型別 -->
    <update id="update" parameterType="pojo.User">
        update mybatis set name=#{name},password=#{password}
        where id = #{id}
    </update>

• update實現

    User user = new User(3, "益達", "你的益達");
    session.update("update", user);

• query.xml

    <!-- 根據ID查詢一個結果，返回值型別為User物件 -->
    <select id="queryUser" resultType="pojo.User">
        select * from mybatis where id = #{id}
    </select>

    <!-- 查詢多個結果,返回值型別為User物件 -->
    <select id="queryUsers" resultType="pojo.User">
        select * from mybatis
    </select>

    <!-- 查詢多個結果，返回resultMap -->
    <resultMap type="pojo.User" id="queryResultMap">
        <id column="id" property="id"></id>
        <result property="name" column="name" />
        <result property="password" column="password" />
    </resultMap>
    <select id="queryMap" resultMap="queryResultMap">
        select * from mybatis
    </select>

• query實現

    // 返回一個查詢結果,返回resultType
    User user = session.selectOne("queryUser", 1);
    System.out.println(user.getName());

    // 返回多個查詢結果,返回resultType
    List<User> results = session.selectList("queryUsers");
    for (User user1 : results) {
        System.out.println(user1.getName() + "---" + user1.getPassword());
    }

    // 返回多個結果,返回resultMap
    List<User> results1 = session.selectList("queryMap");
    for (User user2 : results1) {
        System.out.println(user2.getName() + "---" + user2.getPassword());
    }

• 表
  

專案下載