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.Driverurl=jdbc:mysql://localhost:3306/mybatis?useSSL=true&useUnicode=true&characterEncoding=UTF-8username=rootpassword=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.ConsoleAppenderlog4j.appender.console.Target = System.outlog4j.appender.console.Threshold=DEBUGlog4j.appender.console.layout = org.apache.log4j.PatternLayoutlog4j.appender.console.layout.ConversionPattern=[%c]-%m%n#文件输出的相关设置log4j.appender.file = org.apache.log4j.RollingFileAppenderlog4j.appender.file.File=./log/kuang.loglog4j.appender.file.MaxFileSize=10mblog4j.appender.file.Threshold=DEBUGlog4j.appender.file.layout=org.apache.log4j.PatternLayoutlog4j.appender.file.layout.ConversionPattern=[%p][%d{yy-MM-dd}][%c]%m%n#日志输出级别log4j.logger.org.mybatis=DEBUGlog4j.logger.java.sql=DEBUGlog4j.logger.java.sql.Statement=DEBUGlog4j.logger.java.sql.ResultSet=DEBUGlog4j.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 resultType='com.lf.pojo.User'> select * from mybatis.user </mapper>

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