版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/y694721975/article/details/53769383
1.新建Maven项目
2.创建目录
3.通过pom.xml 导入jar包
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.tyler.mybatis</groupId>
<artifactId>MyBatis_G1</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>MyBatis_G1 Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.2.8</version>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
<!--查看日志的jar包-->
<!-- https://mvnrepository.com/artifact/log4j/log4j -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.21</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.21</version>
</dependency>
<dependency>
<groupId>org.testng</groupId>
<artifactId>testng</artifactId>
<version>RELEASE</version>
</dependency>
</dependencies>
<build>
<finalName>MyBatis</finalName>
<plugins>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.2</version>
<configuration>
<verbose>true</verbose>
<overwrite>true</overwrite>
</configuration>
</plugin>
</plugins>
</build>
</project>
4.generatorConfig.xml（自动生成类的核心文件）
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<!--导入属性配置-->
<properties resource="generatorConfig.properties"/>
<!--指定特定数据库的jdbc驱动jar包的位置-->
<classPathEntry location="${jdbc.driverLocation}"/>
<context id="default" targetRuntime="MyBatis3">
<!-- optional，旨在创建class时，对注释进行控制 -->
<commentGenerator>
<property name="suppressDate" value="true"/>
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--jdbc的数据库连接 -->
<jdbcConnection
driverClass="${jdbc.driverClass}"
connectionURL="${jdbc.connectionURL}"
userId="${jdbc.userId}"
password="${jdbc.password}">
</jdbcConnection>
<!-- 非必需，类型处理器，在数据库类型和java类型之间的转换控制-->
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!-- Model模型生成器,用来生成含有主键key的类，记录类 以及查询Example类
targetPackage 指定生成的model生成所在的包名
targetProject 指定在该项目下所在的路径
-->
<javaModelGenerator targetPackage="com.tyler.model"
targetProject="src/main/java">
<!-- 是否允许子包，即targetPackage.schemaName.tableName -->
<property name="enableSubPackages" value="false"/>
<!-- 是否对model添加 构造函数 -->
<property name="constructorBased" value="true"/>
<!-- 是否对类CHAR类型的列的数据进行trim操作 -->
<property name="trimStrings" value="true"/>
<!-- 建立的Model对象是否 不可改变 即生成的Model对象不会有 setter方法，只有构造方法 -->
<property name="immutable" value="false"/>
</javaModelGenerator>
<!--Mapper映射文件生成所在的目录 为每一个数据库的表生成对应的SqlMap文件 -->
<sqlMapGenerator targetPackage="mapper"
targetProject="src/main/resources">
<property name="enableSubPackages" value="false"/>
</sqlMapGenerator>
<!-- 客户端代码，生成易于使用的针对Model对象和XML配置文件 的代码
type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象
type="MIXEDMAPPER",生成基于注解的Java Model 和相应的Mapper对象
type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口
-->
<javaClientGenerator targetPackage="com.tyler.dao"
targetProject="src/main/java" type="XMLMAPPER">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<!--数据库中表生成类的信息-->
<table tableName="user" domainObjectName="User"
enableCountByExample="false" enableUpdateByExample="false"
enableDeleteByExample="false" enableSelectByExample="false"
selectByExampleQueryId="false">
</table>
</context>
</generatorConfiguration>
generatorConfig.properties（以上配置文件所使用的变量写到这里面，便于管理）
jdbc.driverLocation=E:\\mysqljar\\mysql-connector-java-5.1.5-bin.jar
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.connectionURL=jdbc:mysql://localhost:3306/mybatis
jdbc.userId=root
jdbc.password=root
5.生成文件
如果生成不成功，请使用VPN后再尝试（我没挂VPN，下载不成功）
方法1（方便，但是不能看错误信息）
6.生成成功后的目录
7.以下步骤就是正常的测试过程（要是知道怎么做可以不看）
mybatis核心配置文件：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>
<properties resource="jdbc.properties"/>
<settings>
<setting name="cacheEnabled" value="true"/>
<setting name="defaultStatementTimeout" value="3000"/>
<setting name="mapUnderscoreToCamelCase" value="true"/>
<setting name="useGeneratedKeys" value="true"/>
</settings>
<environments default="development">
<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="${password}"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="mapper/UserMapper.xml"/>
</mappers>
</configuration>
核心配置文件的属性文件：jdbc.properties
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatis
username=root
password=root
日志文件：log4j.properties
#---- global logging configuration
#---- level: FATAL,ERROR,WARN,INFO,DEBUG
#---- appender: console, file, mail
### set log levels ###
log4j.rootLogger=DEBUG,console
### 输出到控制台 ###
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.Target=System.out
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
### 输出到日志文件 ###
log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.File=${uplat.root}/WEB-INF/logs/platform.log
log4j.appender.file.DatePattern=_yyyyMMdd'.log'
#log4j.appender.file.Append = true
#log4j.appender.file.Threshold = INFO
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%-d{yyyy-MM-dd HH\:mm\:ss} [ %t\:%r ] - [ %p ] %m%n
### 打印SQL ###
#log4j.logger.com.ibatis=DEBUG
#log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=DEBUG
#log4j.logger.com.ibatis.common.jdbc.ScriptRunner=DEBUG
#log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=DEBUG
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG
#log4j.logger.java.sql.ResultSet=DEBUG
测试类：
1.获取SqlSession ：SqlSessionFactory.java
package com.tyler.test;
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 java.io.IOException;
import java.io.InputStream;
/**
* Created by tyler on 2016/12/20.
*/
public class SqlSessionFactoryUtil {
private static SqlSessionFactory sqlSessionFactory;
private static final Class CLASS_LOCK = SqlSessionFactoryUtil.class;
private SqlSessionFactoryUtil(){}
private static SqlSessionFactory initSqlSessionFactory(){
String resource = "mybatis-config.xml";
InputStream inputStream = null;
try {
inputStream = Resources.getResourceAsStream(resource);
} catch (IOException e) {
e.printStackTrace();
}
synchronized (CLASS_LOCK){
if(sqlSessionFactory==null){
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
}
}
return sqlSessionFactory;
}
public static SqlSession openSessionFactory(){
if(sqlSessionFactory==null){
initSqlSessionFactory();
}
return sqlSessionFactory.openSession();
}
}
2.测试： MyBatisTest.java
package com.tyler.test;
import com.tyler.dao.UserMapper;
import com.tyler.model.User;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;
/**
* Created by tyler on 2016/12/20.
*/
public class MyBatisTest {
private static SqlSession sqlSession;
@Test
public void query(){
try {
sqlSession = SqlSessionFactoryUtil.openSessionFactory();
UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
User user = userMapper.selectByPrimaryKey(1);
sqlSession.commit();
//重写User类的toString()
System.out.println(user.toString());
} catch (Exception e) {
e.printStackTrace();
sqlSession.rollback();
} finally {
if(sqlSession!=null){
sqlSession.close();
}
}
}
}
最终的目录
