MyBatis环境资源配置实现代码详解

1. pom.xml文件配置

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>

 <groupId>groupId</groupId>
 <artifactId>MyBatis_01</artifactId>
 <packaging>pom</packaging>
 <version>1.0-SNAPSHOT</version>
 <!--导入相关依赖-->
 <dependencies>
  <!--导入MyBatis相关jar包-->
  <dependency>
   <groupId>org.mybatis</groupId>
   <artifactId>mybatis</artifactId>
   <version>3.5.2</version>
  </dependency>
  <!--导入junit测试jar包-->
  <dependency>
   <groupId>junit</groupId>
   <artifactId>junit</artifactId>
   <version>4.12</version>
  </dependency>
  <!--导入连接mysql数据库驱动包-->
  <dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <version>5.1.47</version>
  </dependency>
  <!--导入MyBatis日志jar包-->
  <dependency>
   <groupId>log4j</groupId>
   <artifactId>log4j</artifactId>
   <version>1.2.17</version>
  </dependency>

 </dependencies>

 <!-- 解决Maven静态资源过滤问题 -->
 <build>
  <resources>
   <resource>
    <directory>src/main/resources</directory>
    <includes>
     <include>**/*.properties</include>
     <include>**/*.xml</include>
    </includes>
    <filtering>true</filtering>
   </resource>
   <resource>
    <directory>src/main/java</directory>
    <includes>
     <include>**/*.properties</include>
     <include>**/*.xml</include>
    </includes>
    <filtering>true</filtering>
   </resource>
  </resources>

  <!-- 解决版本问题 -->
  <plugins>
   <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <configuration>
     <source>9</source>
     <target>9</target>
    </configuration>
   </plugin>
  </plugins>
 </build>

</project>

2. MyBatis核心配置文件（如mybatis-config.xml）

<?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>
 <!--导入properties 配置文件-->
 <properties resource="db.properties"/>

 <settings>
  <setting name="logImpl" value="STDOUT_LOGGING"/>
 </settings>

 <environments default="development">
  <!--环境配置默认是development，可修改-->
  <environment id="development">
   <transactionManager type="JDBC"/>
   <dataSource type="POOLED">
    <property name="driver" value="${driver}"/>
    <property name="url" value="${url}"/>
    <property name="username" value="${username}"/>
    <property name="password" value="${password}"/>
   </dataSource>
  </environment>
 </environments>
 <!--Mybatis的mapper注册，定义 SQL 映射语句-->
 <mappers>
  <mapper resource="com/lf/dao/UserMapper.xml"/>
 </mappers>

</configuration>

Properties优化 ：可在资源目录下新建一个db.properties 文件。如：

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatis?useSSL=true&useUnicode=true&characterEncoding=UTF-8
username=root
password=123456

typeAliases优化 ：类型别名是为 Java 类型设置一个短名字，只于xml配置有关

<typeAliases>
<typeAlias type="com.lf.pojo.User" alias="User"/>
</typeAliases>
<!--可以在使用 com.kuang.pojo.User 的地方用 User 代替-->

使用标准日志

<!--标准日志实现-->
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings>

使用 Log4j 日志

Log4j配置文件：（如log4j.properties）

#将等级为DEBUG的日志信息输出到console和file这两个目的地，console和file的定义在下面的代码
log4j.rootLogger=DEBUG,console,file
#控制台输出的相关设置
log4j.appender.console = org.apache.log4j.ConsoleAppender
log4j.appender.console.Target = System.out
log4j.appender.console.Threshold=DEBUG
log4j.appender.console.layout = org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=[%c]-%m%n
#文件输出的相关设置
log4j.appender.file = org.apache.log4j.RollingFileAppender
log4j.appender.file.File=./log/kuang.log
log4j.appender.file.MaxFileSize=10mb
log4j.appender.file.Threshold=DEBUG
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=[%p][%d{yy-MM-dd}][%c]%m%n
#日志输出级别
log4j.logger.org.mybatis=DEBUG
log4j.logger.java.sql=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG

setting设置日志实现

<settings>
<setting name="logImpl" value="LOG4J"/>
</settings>

在程序中使用Log4j进行输出

3. Mapper.xml配置文件

<?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">
<!--namespace 十分重要，不能写错-->
<mapper namespace="com.lf.dao.UserMapper">
 <!--下面写增删改查语句，-->
 <select id="getUserList" resultType="com.lf.pojo.User">
  select * from mybatis.user

  </mapper>

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