一种java工程整合mybatis

最新推荐文章于 2023-05-10 01:56:02 发布

原创最新推荐文章于 2023-05-10 01:56:02 发布 · 392 阅读

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CC 4.0 BY-SA版权

本文详细介绍了MyBatis框架的使用方法，包括Service层、Dao层的实现，XML配置文件的解析，以及MyBatisUtils工具类的创建。通过具体的代码示例，展示了如何在Java项目中集成MyBatis进行数据库操作。

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1.Service
   public void 执行方法(参数){
       try {
           sqlSession = MybatisUtils.getSqlSessionFactory().openSession();
            Dao层= sqlSession.getMapper(Dao层.class);
            执行方法
           sqlSession.commit();
       } catch (Exception e) {
           // TODO: handle exception
           e.printStackTrace();
           sqlSession.rollback();
       }finally{
           sqlSession.close();
       }
   }

2.Dao

public void 方法名称(参数名称);

3.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="Dao全路径">

    <insert id="方法名称" parameterType="形参">
       SQL语句
    </insert>
</mapper>

4.MybatisUtil

package com.jinhui.jhrobotcon.utils;

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;

/**
* 2015-11-16下午05:34:31
* MybatisUtils.java
* author:liuyonghua
*/
public class MybatisUtils {

   private static SqlSessionFactory sqlSessionFactory;

   private static SqlSessionFactory sqlCentralSessionFactory;

    public static SqlSessionFactory getSqlSessionFactory() {
       if(sqlSessionFactory==null){
           String resource = "mybatis-config.xml";
             Reader reader = null;
             try {
                 reader = Resources.getResourceAsReader(resource);
             } catch (IOException e) {
                 System.out.println(e.getMessage());

             }
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
       }
//       System.out.println("sqlSessionFactory--------------"+sqlSessionFactory);
        return sqlSessionFactory;
    }

    public static SqlSessionFactory getCentralSqlSessionFactory() {
       if(sqlCentralSessionFactory==null){
           String resource = "mybatis-config.xml";
             Reader reader = null;
             try {
                 reader = Resources.getResourceAsReader(resource);
             } catch (IOException e) {
                 System.out.println(e.getMessage());

             }
             sqlCentralSessionFactory = new SqlSessionFactoryBuilder().build(reader, "developmentCentral");
       }
//       System.out.println("sqlSessionFactory--------------"+sqlSessionFactory);
        return sqlCentralSessionFactory;
    }

    public static void main(String[] args) {
       SqlSession sqlSession = null;
       try {
//           sqlSession = MybatisUtils.getSqlSessionFactory().openSession();
//           IIcpGnBaxxSlxxViewDao icpGnBaxxSlxxViewDao = sqlSession.getMapper(IIcpGnBaxxSlxxViewDao.class);
//           Map<String, String> map = new HashMap<String, String>();
//           map.put("YM", "wanlitech.com");
//           IcpGnBaxxSlxxViewBean iBean = icpGnBaxxSlxxViewDao.getIcpBeiAn(map);
       } catch (Exception e) {
           // TODO: handle exception
           e.printStackTrace();
       }finally{
           sqlSession.close();
       }
   }
}

5.配置文件

<?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>
   <properties resource="jdbc.properties"/>
    <settings>
        
       <setting name="cacheEnabled" value="true"/>
       
       <setting name="lazyLoadingEnabled" value="true"/>
       
       <setting name="multipleResultSetsEnabled" value="true"/>
       <setting name="useColumnLabel" value="true"/>
       <setting name="useGeneratedKeys" value="true"/>
       <setting name="defaultExecutorType" value="SIMPLE"/>
       
       <setting name="defaultStatementTimeout" value="25000"/>
       <setting name="logImpl" value="LOG4J" />
    </settings>
     <typeAliases>


    </typeAliases>
    <environments default="development">
       <environment id="development">
           <transactionManager type="jdbc"/>
           <dataSource type="POOLED">
              <property name="driver" value="${jdbc.driver}"/>
              <property name="url" value="${jdbc.url}"/>
              <property name="username" value="${jdbc.username}"/>
              <property name="password" value="${jdbc.password}"/>
              <property name="poolMaximumActiveConnections" value="30" />
              <property name="poolTimeToWait" value="5000" />
              <property name="poolPingEnabled" value="true"/>
              <property name="poolPingQuery" value="select 1 from dual" />
           </dataSource>
       </environment>

    </environments>
    <mappers>

        <mapper resource="com/jinhui/jhrobotcon/mybatis/StoppointPath.xml" />
    </mappers>
</configuration>