JavaWeb_(Mybatis框架)主配置文件介绍_四

　　系列博文：　　

　　　　JavaWeb_(Mybatis框架)JDBC操作数据库和Mybatis框架操作数据库区别_一　　　　

　　　　JavaWeb_(Mybatis框架)使用Mybatis对表进行增、删、改、查操作_二　　　　　　

　　　　JavaWeb_(Mybatis框架)Mapper动态代理开发_三　　　　　　　　　　　　　　　

　　　　JavaWeb_(Mybatis框架)输入和输出参数_五　　　　　　　　　　　　　　　　　　

　　　　JavaWeb_(Mybatis框架)关联查询_六传送门　　　　　　　　　　　　　　　　　　

　　　　JavaWeb_(Mybatis框架)动态sql_七传送门　　　　　　　　　　　　　　　　　　　

MyBatis 主配置文件SqlMapConfig.xml说明：(注意顺序)　　官方博客：传送门

1、properties（读取配置文件）
2、settings（全局配置参数）
3、typeAliases（类型别名）
4、typeHandlers（类型处理器）
5、objectFactory（对象工厂）
6、plugins（插件）
7、environments（环境集合属性对象，与Spring框架整合后Say Good Bye）
　　a)environment（环境子属性对象）
　　b)transactionManager（事务管理）
　　c)dataSource（数据源）
8、mappers（配置映射器位置）

1、使用properties读取db.properties配置文件

　　db.properties配置文件

    jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/ssm_mybatis
    jdbc.username=root
    jdbc.password=123456

　　sqlMapConfig.xml中使用properties读取配置文件

　　<properties resource="db.properties"/> 

　　<dataSource type="POOLED">
　　　　<property name="driver" value="${jdbc.driver}">property>
　　　　<property name="url" value="${jdbc.url}">property>
　　　　<property name="username" value="${jdbc.username}">property>
　　　　<property name="password" value="${jdbc.password}">property>
　　dataSource>

    jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/ssm_mybatis
    jdbc.username=root
    jdbc.password=123456

db.properties

<?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="db.properties"/> 

  <environments default="development">
    <environment id="development">
        
      <transactionManager type="JDBC"/>
          
      <dataSource type="POOLED">
        <property name="driver" value="${jdbc.driver}">property>
        <property name="url" value="${jdbc.url}">property>
        <property name="username" value="${jdbc.username}">property>
        <property name="password" value="${jdbc.password}">property>
      dataSource>
    environment>
  environments>

  
  <mappers>
    <mapper resource="mapper/UserMapper.xml"/>
  mappers>
  
configuration>

sqlMapConfig.xml

2、sqlMapConfig-typeAliases别名配置

　　配置别名有两种方式，一种是单独给bean对象配置别名，另一种是直接给包配置别名

    
  <typeAliases>
      <typeAlias type="com.Gary.bean.User" alias="user"/>
      
      <package name="com.Gary.bean"/>
  typeAliases>

　　单独给bean对象配置别名

　　在sqlMapConfig.xml文件下配置com.Gary.bean.User类型的typeAliases别名

    
  <typeAliases>
      <typeAlias type="com.Gary.bean.User" alias="user"/>
  typeAliases>

　　UserMapper下的查询一个用户返回就可以直接返回他的user

     <select id="selectUserById" parameterType="Integer" resultType="user">
         select * from user where u_id = #{id}
     select>

<?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="db.properties"/> 

    
  <typeAliases>
      <typeAlias type="com.Gary.bean.User" alias="user"/>
  typeAliases>

  <environments default="development">
    <environment id="development">
        
      <transactionManager type="JDBC"/>
          
      <dataSource type="POOLED">
        <property name="driver" value="${jdbc.driver}">property>
        <property name="url" value="${jdbc.url}">property>
        <property name="username" value="${jdbc.username}">property>
        <property name="password" value="${jdbc.password}">property>
      dataSource>
    environment>
  environments>

  
  <mappers>
    <mapper resource="mapper/UserMapper.xml"/>
  mappers>
  
configuration>

sqlMapConfig.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="com.Gary.mapper.UserMapper">
 
     <select id="selectUserById" parameterType="Integer" resultType="user">
         select * from user where u_id = #{id}
     select>
     
     
     
     
     
     <select id="selectUserByName" parameterType="String" resultType="com.Gary.bean.User">
         
              select * from user where u_username like "%"#{name}"%"
     select>
     
     
     <insert id="insertUser" parameterType="com.Gary.bean.User">
         insert into user values(null,#{u_username},#{u_password},#{u_sex},#{u_createTime},#{u_cid})
     insert>
     
    
     <update id="updateUser" parameterType="com.Gary.bean.User">
         update user set u_username = #{u_username} where u_id = #{u_id}
     update>
     
     
     <delete id="deleteUserById" parameterType="Integer">
         delete from user where u_id = #{id}
     delete>
     
mapper>

UserMapper.xml

package com.Gary.test;

import java.io.IOException;
import java.io.InputStream;

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.Gary.bean.User;
import com.Gary.mapper.UserMapper;

public class MapperTest {

    @Test
    public void Test1() throws IOException {
        //读取配置文件
        String resource = "sqlMapConfig.xml";
                
        InputStream in = Resources.getResourceAsStream(resource);
                
        //创建sqlSessionFactory
        SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
                
        //生产一个sqlSession
        SqlSession session = ssf.openSession();
                
        UserMapper mapper = session.getMapper(UserMapper.class);
        
        User user = mapper.selectUserById(1);
        
        System.out.println(user);
        
    }
    
}

MapperTest.java

　　给整个包配置别名(别名为类名，不区别大小写，推荐使用这种方式配置别名)

<?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="db.properties"/> 

    
  <typeAliases>
      
      <package name="com.Gary.bean"/>
  typeAliases>

  <environments default="development">
    <environment id="development">
        
      <transactionManager type="JDBC"/>
          
      <dataSource type="POOLED">
        <property name="driver" value="${jdbc.driver}">property>
        <property name="url" value="${jdbc.url}">property>
        <property name="username" value="${jdbc.username}">property>
        <property name="password" value="${jdbc.password}">property>
      dataSource>
    environment>
  environments>

  
  <mappers>
    <mapper resource="mapper/UserMapper.xml"/>
  mappers>
  
configuration>

sqlMapConfig.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="com.Gary.mapper.UserMapper">
 
     <select id="selectUserById" parameterType="Integer" resultType="user">
         select * from user where u_id = #{id}
     select>
     
     
     
     
     
     <select id="selectUserByName" parameterType="String" resultType="com.Gary.bean.User">
         
              select * from user where u_username like "%"#{name}"%"
     select>
     
     
     <insert id="insertUser" parameterType="com.Gary.bean.User">
         insert into user values(null,#{u_username},#{u_password},#{u_sex},#{u_createTime},#{u_cid})
     insert>
     
    
     <update id="updateUser" parameterType="com.Gary.bean.User">
         update user set u_username = #{u_username} where u_id = #{u_id}
     update>
     
     
     <delete id="deleteUserById" parameterType="Integer">
         delete from user where u_id = #{id}
     delete>
     
mapper>

UserMapper.xml

package com.Gary.test;

import java.io.IOException;
import java.io.InputStream;

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.Gary.bean.User;
import com.Gary.mapper.UserMapper;

public class MapperTest {

    @Test
    public void Test1() throws IOException {
        //读取配置文件
        String resource = "sqlMapConfig.xml";
                
        InputStream in = Resources.getResourceAsStream(resource);
                
        //创建sqlSessionFactory
        SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
                
        //生产一个sqlSession
        SqlSession session = ssf.openSession();
                
        UserMapper mapper = session.getMapper(UserMapper.class);
        
        User user = mapper.selectUserById(1);
        
        System.out.println(user);
        
    }
    
}

MapperTest.java

3、sqlMapConfig-mapper映射器位置　　官方文档：传送门

 
  <mappers>
      
    <mapper resource="mapper/UserMapper.xml"/>
    
    <mapper url="file:\\\F:\SSH\pro\ssm_mybatis\src\mapper">
    
    <mapper class="com.Gary.mapper.UserMapper"/>
    
    
    <package name="com.Gary.mapper"/>
    
  mappers>

<?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="db.properties"/> 

    
  <typeAliases>
      
      <package name="com.Gary.bean"/>
  typeAliases>

  <environments default="development">
    <environment id="development">
        
      <transactionManager type="JDBC"/>
          
      <dataSource type="POOLED">
        <property name="driver" value="${jdbc.driver}">property>
        <property name="url" value="${jdbc.url}">property>
        <property name="username" value="${jdbc.username}">property>
        <property name="password" value="${jdbc.password}">property>
      dataSource>
    environment>
  environments>

  
  <mappers>
      
    <mapper resource="mapper/UserMapper.xml"/>
    
    <mapper url="file:\\\F:\SSH\pro\ssm_mybatis\src\mapper">
    
    <mapper class="com.Gary.mapper.UserMapper"/>
    
    
    <package name="com.Gary.mapper"/>
    
  mappers>
  
configuration>

sqlMapConfig.xml

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