mybatis框架整合及逆向工程
一、三大框架整合
整合SSM框架
1、导入pom文件
1、导入spring的pom依赖
<?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>com.courage</groupId>
<artifactId>ssm</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<!-- https://mvnrepository.com/artifact/junit/junit -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.3.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/cglib/cglib -->
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>3.3.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.5</version>
</dependency>
<!-- https://mvnrepository.com/artifact/aopalliance/aopalliance -->
<dependency>
<groupId>aopalliance</groupId>
<artifactId>aopalliance</artifactId>
<version>1.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-aspects -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>5.2.3.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.21</version>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.48</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>5.2.3.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.3.RELEASE</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jsp-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.10.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.10.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.10.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.6</version>
</dependency>
<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.16</version>
</dependency>
<!-- https://mvnrepository.com/artifact/log4j/log4j -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.4</version>
</dependency>
</dependencies>
</project>
2、编写各个框架的配置文件
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring.xml</param-value>
</context-param>
<!--springmvc的核心配置类-->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!--字符编码过滤器-->
<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--支持rest风格的过滤器-->
<filter>
<filter-name>HiddenHttpMethodFilter</filter-name>
<filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>HiddenHttpMethodFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
springmvc.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!--springmvc只扫描控制器-->
<context:component-scan base-package="com.courage" use-default-filters="false">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<!--静态资源的扫描-->
<mvc:default-servlet-handler></mvc:default-servlet-handler>
<!--动态资源的扫描-->
<mvc:annotation-driven></mvc:annotation-driven>
<!--配置视图管理器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/page/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
spring.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
https://www.springframework.org/schema/tx/spring-tx.xsd
">
<!--Spring除了控制器不扫描，其他的组件都扫描，包括service，component等-->
<context:component-scan base-package="com.courage">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<!--引入外部配置文件-->
<context:property-placeholder location="classpath:db.properties"></context:property-placeholder>
<!--配置数据源-->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="username" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
<property name="driverClassName" value="${jdbc.driverName}"></property>
<property name="url" value="${jdbc.url}"></property>
</bean>
<!--配置事务管理器的bean对象-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!--开启基于注解的事务管理器的配置-->
<tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>
<!--添加mybatis的配置-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--指定配置文件的位置-->
<property name="configLocation" value="classpath:mybatis-config.xml"></property>
<property name="dataSource" ref="dataSource"></property>
<property name="mapperLocations" value="classpath:com/courage/dao/*.xml"></property>
</bean>
<!--创建mybatis扫描器，批量配置映射文件-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.courage.dao"></property>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean>
</beans>
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>
<settings>
<setting name="mapUnderscoreToCamelCase" value="true"/>
</settings>
<typeAliases>
<package name="com.courage.bean"/>
</typeAliases>
</configuration>
db.properties
jdbc.username=root
jdbc.password=123456
jdbc.url=jdbc:mysql://192.168.85.111:3306/demo?serverTimezone=UTC
jdbc.driverName=com.mysql.jdbc.Driver
拷贝映射文件，还是位于com.courage.dao目录
<?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:编写接口的全类名，就是告诉要实现该配置文件是哪个接口的具体实现-->
<mapper namespace="com.courage.dao.EmpDao">
<!-- <cache></cache>-->
<!-- <cache type="org.mybatis.caches.ehcache.EhcacheCache"></cache>-->
<!--
select:表示这个操作是一个查询操作
id表示的是要匹配的方法的名称
resultType:表示返回值的类型，查询操作必须要包含返回值的类型
#{属性名}：表示要传递的参数的名称
-->
<select id="findEmpByEmpno" resultType="emp">
select * from emp where empno = #{empno}
</select>
<!--增删改查操作不需要返回值，增删改返回的是影响的行数，mybatis会自动做判断-->
<insert id="insertEmp">
insert into emp(empno,ename) values(#{empno},#{ename})
</insert>
<update id="updateEmp">
update emp set ename=#{ename} where empno = #{empno}
</update>
<delete id="deleteEmp">
delete from emp where empno = #{empno}
</delete>
<!--
当查询语句中包含多个参数的是，如果使用#{属性名称}就无法获取具体的值了，那么应该如何使用呢？
下面就是mybatis的参数传递方式
1、如果是单个参数，
基本类型：使用#{随便写}
引用类型：使用#{类的属性名称}
2、多个参数：
当查询的时候传入多个参数的时候，就无法简单的通过#{参数名}来获取值了，
只能通过arg0,arg1...或者param1,param2等方式来获取值
原因就在于，mybatis在传入多个参数的时候，会将这些参数封装到一个map中，此时map中的key就是
arg0,arg1,param1,param2这些值，但是很明显，这样的传值方式不是很友好，没有办法根据参数的名称来
获取具体的值，因此可以使用如下的方式来指定参数的key是什么
Emp selectEmpByNoAndName(@Param("empno") Integer empno, @Param("ename") String ename);
也就是通过@Param来指定存入map中的key值是什么
3、使用map来传递参数：
依然是直接使用#{key}来获取具体的属性值
-->
<!--
当使用#{}来获取值的时候会发现打印的sql语句如下：
select * from emp where empno=? and ename=?
当使用${}来获取值的时候会发现打印的sql语句如下：
select * from emp where empno=7369 and ename='SMITH'
通过刚刚的案例大家已经发现了存在的问题了，
使用#{}方式进行取值：采用的是参数预编译的方式，参数的位置使用？进行替代，不会出现sql注入的问题
使用${}方式进行取值：采用的是直接跟sql语句进行拼接的方式
-->
<select id="selectEmpByNoAndName" resultType="com.courage.bean.Emp">
select * from ${t} where empno=${empno} and ename=${ename}
</select>
<select id="selectEmpByNoAndName2" resultType="com.courage.bean.Emp">
select * from emp where empno=#{empno} and ename=#{ename}
</select>
<!--当返回值的结果是集合的时候，返回值的类型依然写的是集合中具体的类型-->
<select id="selectAllEmp" resultType="com.courage.bean.Emp">
select * from emp
</select>
<!--在查询的时候可以设置返回值的类型为map，当mybatis查询完成之后会把列的名称作为key
列的值作为value，转换到map中
-->
<select id="selectEmpByEmpReturnMap" resultType="map">
select * from emp where empno = #{empno}
</select>
<!--注意，当返回的结果是一个集合对象的是，返回值的类型一定要写集合具体value的类型
同时在dao的方法上要添加@MapKey的注解，来设置key是什么结果
@MapKey("empno")
Map<Integer,Emp> getAllEmpReturnMap();-->
<select id="getAllEmpReturnMap" resultType="com.courage.bean.Emp">
select * from emp
</select>
<!--再做查询的时候，有时候需要关联其他对象，因此需要使用关联查询
可以通过下面自定义结果集的方式实现
-->
<select id="selectEmpAndDept" resultMap="empDept">
select * from emp left join dept on emp.deptno = dept.deptno where empno = #{empno};
</select>
<!--<resultMap id="empDept" type="com.courage.bean.Emp">
<id column="empno" property="empno"></id>
<result column="ename" property="ename"></result>
<result column="job" property="job"></result>
<result column="mgr" property="mgr"></result>
<result column="hiredate" property="hiredate"></result>
<result column="sal" property="sal"></result>
<result column="comm" property="common"></result>
<result column="deptno" property="dept.deptno"></result>
<result column="dname" property="dept.dname"></result>
<result column="loc" property="dept.loc"></result>
</resultMap>-->
<!--在mybatis中还提供了一种简单的形式，使用association标签可以搞定
-->
<resultMap id="empDept" type="com.courage.bean.Emp">
<id column="empno" property="empno"></id>
<result column="ename" property="ename"></result>
<result column="job" property="job"></result>
<result column="mgr" property="mgr"></result>
<result column="hiredate" property="hiredate"></result>
<result column="sal" property="sal"></result>
<result column="comm" property="common"></result>
<association property="dept" javaType="com.courage.bean.Dept">
<id column="deptno" property="deptno"></id>
<result column="dname" property="dname"></result>
<result column="loc" property="loc"></result>
</association>
</resultMap>
<select id="selectEmpAndDeptBySimple" resultMap="simpleEmpAndDept">
select * from emp where empno = #{empno}
</select>
<resultMap id="simpleEmpAndDept" type="com.courage.bean.Emp">
<id column="empno" property="empno"></id>
<result column="ename" property="ename"></result>
<result column="job" property="job"></result>
<result column="mgr" property="mgr"></result>
<result column="hiredate" property="hiredate"></result>
<result column="sal" property="sal"></result>
<result column="comm" property="common"></result>
<association property="dept" select="com.courage.dao.DeptDao.getDeptAndEmpsBySimple" column="deptno" fetchType="eager">
</association>
</resultMap>
<select id="selectEmpByStep" resultType="com.courage.bean.Emp">
select * from emp where deptno = #{deptno}
</select>
<!-- <select id="getEmpByCondition" resultType="com.courage.bean.Emp">
select * from emp
<where>
<if test="empno!=null">
empno > #{empno}
</if>
<if test="ename!=null">
and ename like #{ename}
</if>
<if test="sal!=null">
and sal > #{sal}
</if>
</where>-->
<!--
trim截取字符串：
prefix：前缀，为sql整体添加一个前缀
prefixOverrides:去除整体字符串前面多余的字符
suffixOverrides:去除后面多余的字符串
-->
<select id="getEmpByCondition" resultType="com.courage.bean.Emp">
select * from emp
<trim prefix="where" prefixOverrides="and" suffixOverrides="and">
<if test="empno!=null">
empno > #{empno} and
</if>
<if test="ename!=null">
ename like #{ename} and
</if>
<if test="sal!=null">
sal > #{sal} and
</if>
</trim>
</select>
<!--foreach是对集合进行遍历
collection="deptnos" 指定要遍历的集合
close="" 表示以什么结束
index="" 给定一个索引值
item="" 遍历的每一个元素的值
open="" 表示以什么开始
separator="" 表示多个元素的分隔符
-->
<select id="getEmpByDeptnos" resultType="Emp">
select * from emp where deptno in
<foreach collection="deptnos" close=")" index="idx" item="deptno" open="(" separator=",">
#{deptno}
</foreach>
</select>
<select id="getEmpByConditionChoose" resultType="com.courage.bean.Emp">
select * from emp
<where>
<choose>
<when test="empno!=null">
empno > #{empno}
</when>
<when test="ename!=null">
ename like #{ename}
</when>
<when test="sal!=null">
sal > #{sal}
</when>
<otherwise>
1=1
</otherwise>
</choose>
</where>
</select>
<update id="updateEmpByEmpno">
update emp
<set>
<if test="empno!=null">
empno=#{empno},
</if>
<if test="ename!=null">
ename = #{ename},
</if>
<if test="sal!=null">@
sal = #{sal}
</if>
</set>
<where>
empno = #{empno}
</where>
</update>
</mapper>
<?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.courage.dao.DeptDao">
<!--定义查询集合元素-->
<select id="getDeptAndEmps" resultMap="deptEmp">
select * from dept left join emp on dept.deptno = emp.deptno where dept.deptno=#{deptno}
</select>
<resultMap id="deptEmp" type="com.courage.bean.Dept">
<id property="deptno" column="deptno"></id>
<result property="dname" column="dname"></result>
<result property="loc" column="loc"></result>
<!--封装集合类的元素
property：指定集合的属性
ofType:指定集合中的元素类型
-->
<collection property="emps" ofType="com.courage.bean.Emp">
<id property="empno" column="empno"></id>
<result column="ename" property="ename"></result>
<result column="job" property="job"></result>
<result column="mgr" property="mgr"></result>
<result column="hiredate" property="hiredate"></result>
<result column="sal" property="sal"></result>
<result column="comm" property="common"></result>
</collection>
</resultMap>
<select id="getDeptAndEmpsBySimple" resultType="com.courage.bean.Dept">
select * from dept where deptno = #{deptno}
</select>
<select id="getDeptAndEmpsByStep" resultMap="deptEmpByStep">
select * from dept where deptno = #{deptno}
</select>
<resultMap id="deptEmpByStep" type="com.courage.bean.Dept">
<id property="deptno" column="deptno"></id>
<result property="dname" column="dname"></result>
<result property="loc" column="loc"></result>
<!--封装集合类的元素
property：指定集合的属性
ofType:指定集合中的元素类型
-->
<collection property="emps" ofType="com.courage.bean.Emp" select="com.courage.dao.EmpDao.selectEmpByStep" column="deptno" >
</collection>
</resultMap>
</mapper>
添加dao的接口
EmpDao.java
package com.courage.dao;
import com.courage.bean.Emp;
import org.apache.ibatis.annotations.MapKey;
import org.apache.ibatis.annotations.Param;
import java.util.List;
import java.util.Map;
public interface EmpDao {
public Emp findEmpByEmpno(Integer empno);
public int updateEmp(Emp emp);
public int deleteEmp(Integer empno);
public int insertEmp(Emp emp);
Emp selectEmpByNoAndName(@Param("empno") Integer empno, @Param("ename") String ename, @Param("t") String tablename);
Emp selectEmpByNoAndName2(Map<String, Object> map);
List<Emp> selectAllEmp();
Map<String,Object> selectEmpByEmpReturnMap(Integer empno);
@MapKey("empno")
Map<Integer,Emp> getAllEmpReturnMap();
Emp selectEmpAndDept(Integer empno);
Emp selectEmpAndDeptBySimple(Integer empno);
List<Emp> selectEmpByStep(Integer deptno);
public List<Emp> getEmpByCondition(Emp emp);
public List<Emp> getEmpByConditionChoose(Emp emp);
public List<Emp> getEmpByDeptnos(@Param("deptnos") List<Integer> deptnos);
public int updateEmpByEmpno(Emp emp);
}
3、创建测试类
TestController.java
package com.courage.controller;
import com.courage.bean.Emp;
import com.courage.dao.EmpDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class TestController {
@Autowired
EmpDao empDao;
@RequestMapping("/test")
public String test(){
System.out.println("test");
Emp empByEmpno = empDao.findEmpByEmpno(7369);
System.out.println(empByEmpno);
return "success";
}
}
二、mybatis逆向工程
1、引入pom依赖
<!-- https://mvnrepository.com/artifact/org.mybatis.generator/mybatis-generator-core -->
<dependency>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-core</artifactId>
<version>1.4.0</version>
</dependency>
2、编写配置文件：
<!DOCTYPE generatorConfiguration PUBLIC
"-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<context id="simple" targetRuntime="MyBatis3">
<!--指向数据库连接-->
<jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
connectionURL="jdbc:mysql://192.168.85.111:3306/demo?serverTimezone=UTC"
userId="root"
password="123456"
/>
<!--生成对应的实体类
targetPackage：指定生成java文件的目录
targetProject：放在那个工程的哪个目录下
-->
<javaModelGenerator targetPackage="com.courage.bean" targetProject="src/main/java"/>
<!--SQL映射文件生成器
targetPackage：指定生成java文件的目录
targetProject：放在那个工程的哪个目录下
-->
<sqlMapGenerator targetPackage="com.courage.dao" targetProject="src/main/resources"/>
<!--dao接口生成器-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.courage.dao" targetProject="src/main/java"/>
<!--指定要逆向生成的数据表
tableName:表名
domainObjectName:对象名
-->
<table tableName="emp" domainObjectName="Emp" enableCountByExample="false" enableDeleteByExample="false" enableUpdateByExample="false" selectByExampleQueryId="false" enableSelectByExample="false"/>
<table tableName="dept" domainObjectName="Dept" enableCountByExample="false" enableDeleteByExample="false" enableUpdateByExample="false" selectByExampleQueryId="false" enableSelectByExample="false"/>
</context>
</generatorConfiguration>
3、编写测试类
package com.courage;
import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.exception.InvalidConfigurationException;
import org.mybatis.generator.exception.XMLParserException;
import org.mybatis.generator.internal.DefaultShellCallback;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
public class Test {
public static void main(String[] args) throws IOException, XMLParserException, InvalidConfigurationException, SQLException, InterruptedException {
List<String> warnings = new ArrayList<String>();
boolean overwrite = true;
File configFile = new File("mbg.xml");
ConfigurationParser cp = new ConfigurationParser(warnings);
Configuration config = cp.parseConfiguration(configFile);
DefaultShellCallback callback = new DefaultShellCallback(overwrite);
MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
myBatisGenerator.generate(null);
}
}
三、分页插件 PageHelper
<?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>
<settings>
<!-- 是否启用延迟加载 -->
<setting name="lazyLoadingEnabled" value="false" />
<!-- 在null时也调用 setter,适应于返回Map,3.2版本以上可用 majiawu20180111添加如有问题，联系本人主要是为了统计查询-->
<!-- <setting name="callSettersOnNulls" value="true"/> -->
<!--
<setting name="cacheEnabled" value="true" />
<setting name="multipleResultSetsEnabled" value="true" />
<setting name="useColumnLabel" value="true" />
<setting name="useGeneratedKeys" value="false" />
<setting name="autoMappingBehavior" value="PARTIAL" />
<setting name="defaultExecutorType" value="SIMPLE" />
<setting name="defaultStatementTimeout" value="25" />
<setting name="safeRowBoundsEnabled" value="false" />
<setting name="mapUnderscoreToCamelCase" value="false" />
<setting name="localCacheScope" value="SESSION" />
<setting name="jdbcTypeForNull" value="OTHER" />
<setting name="lazyLoadTriggerMethods" value="equals,clone,hashCode,toString" />
-->
</settings>
<!--为类起别名 -->
<typeAliases>
<!-- <typeAlias alias="Author" type="domain.blog.Author"/>
<typeAlias alias="userInfo" type="com.courage.test.entity.UserInfo"/> -->
</typeAliases>
<!--
plugins在配置文件中的位置必须符合要求，否则会报错，顺序如下:
properties?, settings?,
typeAliases?, typeHandlers?,
objectFactory?,objectWrapperFactory?,
plugins?,
environments?, databaseIdProvider?, mappers?
-->
<plugins>
<!-- com.github.pagehelper为PageHelper类所在包名 -->
<plugin interceptor="com.github.pagehelper.PageHelper">
<!-- 4.0.0以后版本可以不设置该参数 标示用数据库 -->
<property name="dialect" value="oracle"/>
<!-- 该参数默认为false -->
<!-- 设置为true时，会将RowBounds第一个参数offset当成pageNum页码使用 -->
<!-- 和startPage中的pageNum效果一样-->
<property name="offsetAsPageNum" value="true"/>
<!-- 该参数默认为false -->
<!-- 设置为true时，使用RowBounds分页会进行count查询 -->
<property name="rowBoundsWithCount" value="true"/>
<!-- 设置为true时，如果pageSize=0或者RowBounds.limit = 0就会查询出全部的结果 -->
<!-- （相当于没有执行分页查询，但是返回结果仍然是Page类型）-->
<property name="pageSizeZero" value="true"/>
<!-- 3.3.0版本可用 - 分页参数合理化，默认false禁用 -->
<!-- 启用合理化时，如果pageNum<1会查询第一页，如果pageNum>pages会查询最后一页 -->
<!-- 禁用合理化时，如果pageNum<1或pageNum>pages会返回空数据 -->
<property name="reasonable" value="false"/>
<!-- 3.5.0版本可用 - 为了支持startPage(Object params)方法 -->
<!-- 增加了一个`params`参数来配置参数映射，用于从Map或ServletRequest中取值 -->
<!-- 可以配置pageNum,pageSize,count,pageSizeZero,reasonable,orderBy,不配置映射的用默认值 -->
<!-- 不理解该含义的前提下，不要随便复制该配置 -->
<property name="params" value="pageNum=pageHelperStart;pageSize=pageHelperRows;"/>
<!-- 支持通过Mapper接口参数来传递分页参数 -->
<property name="supportMethodsArguments" value="false"/>
<!-- always总是返回PageInfo类型,check检查返回类型是否为PageInfo,none返回Page -->
<property name="returnPageInfo" value="none"/>
</plugin>
</plugins>
<!-- 添加mybatis的 mapper文件 -->
<mappers>
</mappers>
</configuration>