1 引入

1.1 作用

替我们生成常用的增删改查操作的SQL语句。

1.2 代码官方发布地址

通用Mapper

1.3 前置知识

Mybatis
Spring

2 入门

2.1 创建数据库表和实体类

数据库表

DROP TABLE IF EXISTS `employee`; CREATE TABLE `employee`  (   `id` int(11) NOT NULL AUTO_INCREMENT,   `name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '姓名',   `gender` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '性别',   `email` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '邮箱',   PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 4 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;  -- ---------------------------- -- Records of employee -- ---------------------------- INSERT INTO `employee` VALUES (1, '许威威', '男', 'xuweiwei@qq.com'); INSERT INTO `employee` VALUES (2, '孙夏萍', '女', 'sunxiaping@qq,com'); INSERT INTO `employee` VALUES (3, '杜国庆', '男', 'duguoqing@qq.com');

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实体类

package com.xuweiwei.mapper.model;  import java.io.Serializable;  /**  * @describe:  * @author: 不为往事扰，余生只爱笑。  * @version: 1.0  */ public class Employee implements Serializable {      private Integer id;     private String name;     private String gender;     private String email;      public Integer getId() {         return id;     }      public void setId(Integer id) {         this.id = id;     }      public String getName() {         return name;     }      public void setName(String name) {         this.name = name;     }      public String getGender() {         return gender;     }      public void setGender(String gender) {         this.gender = gender;     }      public String getEmail() {         return email;     }      public void setEmail(String email) {         this.email = email;     } }

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2.2 Mybatis整合Spring

2.2.1 所需要的依赖

pom.xml

<dependency>             <groupId>junit</groupId>             <artifactId>junit</artifactId>             <version>4.12</version>             <scope>test</scope>         </dependency>         <dependency>             <groupId>tk.mybatis</groupId>             <artifactId>mapper</artifactId>             <version>4.0.0-beta3</version>         </dependency>         <dependency>             <groupId>log4j</groupId>             <artifactId>log4j</artifactId>             <version>1.2.17</version>         </dependency>         <dependency>             <groupId>cglib</groupId>             <artifactId>cglib</artifactId>             <version>2.2</version>         </dependency>         <dependency>             <groupId>org.aspectj</groupId>             <artifactId>aspectjweaver</artifactId>             <version>1.6.8</version>         </dependency>         <dependency>             <groupId>org.slf4j</groupId>             <artifactId>slf4j-api</artifactId>             <version>1.7.7</version>         </dependency>         <dependency>             <groupId>org.slf4j</groupId>             <artifactId>slf4j-log4j12</artifactId>             <version>1.7.7</version>         </dependency>         <dependency>             <groupId>org.mybatis</groupId>             <artifactId>mybatis</artifactId>             <version>3.2.8</version>         </dependency>         <dependency>             <groupId>org.mybatis</groupId>             <artifactId>mybatis-spring</artifactId>             <version>1.2.2</version>         </dependency>         <dependency>             <groupId>com.mchange</groupId>             <artifactId>c3p0</artifactId>             <version>0.9.2</version>         </dependency>         <dependency>             <groupId>org.springframework</groupId>             <artifactId>spring-context</artifactId>             <version>4.3.10.RELEASE</version>         </dependency>         <dependency>             <groupId>org.springframework</groupId>             <artifactId>spring-test</artifactId>             <version>4.3.10.RELEASE</version>         </dependency>         <dependency>             <groupId>mysql</groupId>             <artifactId>mysql-connector-java</artifactId>             <version>5.1.37</version>         </dependency>         <dependency>             <groupId>org.springframework</groupId>             <artifactId>spring-orm</artifactId>             <version>4.3.10.RELEASE</version>         </dependency>         <dependency>             <groupId>org.springframework</groupId>             <artifactId>spring-test</artifactId>             <version>4.3.10.RELEASE</version>         </dependency>

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2.2.2 配置文件

db.properties

jdbc.user=root jdbc.password=123456 jdbc.url=jdbc:mysql://localhost:3306/mapper?useUnicode=true&characterEncoding=utf8 jdbc.driver=com.mysql.jdbc.Driver

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log4j.properties

log4j.rootLogger=DEBUG,myConsole log4j.appender.myConsole=org.apache.log4j.ConsoleAppender log4j.appender.myConsole.ImmediateFlush=true log4j.appender.myConsole.Target=System.out log4j.appender.myConsole.layout=org.apache.log4j.PatternLayout log4j.appender.myConsole.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n  log4j.logger.com.mchange.v2=ERROR

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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>  </configuration>

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applicationContext.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:aop="http://www.springframework.org/schema/aop"        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 http://www.springframework.org/schema/context/spring-context-4.3.xsd         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">      <!-- 配置数据源 -->     <context:property-placeholder location="classpath:db.properties"/>      <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">         <property name="user" value="${jdbc.user}"/>         <property name="password" value="${jdbc.password}"/>         <property name="jdbcUrl" value="${jdbc.url}"/>         <property name="driverClass" value="${jdbc.driver}"/>     </bean>      <!-- 整合MyBatis -->     <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">         <property name="configLocation" value="classpath:mybatis-config.xml"/>         <property name="dataSource" ref="dataSource"/>     </bean>      <!-- 整合通用Mapper所需要做的配置修改： -->     <!-- 原始全类名：org.mybatis.spring.mapper.MapperScannerConfigurer -->     <!-- 通用Mapper使用：tk.mybatis.spring.mapper.MapperScannerConfigurer -->     <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">         <property name="basePackage" value="com.xuweiwei.mapper.mapper"/>     </bean>      <!-- 配置Service自动扫描的包 -->     <context:component-scan base-package="com.xuweiwei"/>      <!-- 配置声明式事务 -->     <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">         <property name="dataSource" ref="dataSource"/>     </bean>      <tx:annotation-driven transaction-manager="transactionManager"/> </beans>

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2.2.3 测试

测试

package com.xuweiwei.mapper;  import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;  import javax.sql.DataSource;  /**  * @describe:  * @author: 不为往事扰，余生只爱笑。  * @version: 1.0  */ @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations = "classpath*:applicationContext.xml") public class MapperTest {     @Autowired     private DataSource dataSource;      @Test     public void testDataSource() {         System.out.println(dataSource);     } }

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2.3 集成通用Mapper

2.3.1 pom.xml

加入所需要的jar包

        <dependency>             <groupId>tk.mybatis</groupId>             <artifactId>mapper</artifactId>             <version>4.0.0-beta3</version>         </dependency>

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2.3.1 修改appliationContext.xml文件

applicationContext.xml

    <!-- 整合通用Mapper所需要做的配置修改： -->     <!-- 原始全类名：org.mybatis.spring.mapper.MapperScannerConfigurer -->     <!-- 通用Mapper使用：tk.mybatis.spring.mapper.MapperScannerConfigurer -->     <bean class="tk.mybatis.spring.mapper.MapperScannerConfigurer">         <property name="basePackage" value="com.xuweiwei.mapper.mapper"/>     </bean>

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<?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:aop="http://www.springframework.org/schema/aop"        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 http://www.springframework.org/schema/context/spring-context-4.3.xsd         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">      <!-- 配置数据源 -->     <context:property-placeholder location="classpath:db.properties"/>      <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">         <property name="user" value="${jdbc.user}"/>         <property name="password" value="${jdbc.password}"/>         <property name="jdbcUrl" value="${jdbc.url}"/>         <property name="driverClass" value="${jdbc.driver}"/>     </bean>      <!-- 整合MyBatis -->     <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">         <property name="configLocation" value="classpath:mybatis-config.xml"/>         <property name="dataSource" ref="dataSource"/>     </bean>      <!-- 整合通用Mapper所需要做的配置修改： -->     <!-- 原始全类名：org.mybatis.spring.mapper.MapperScannerConfigurer -->     <!-- 通用Mapper使用：tk.mybatis.spring.mapper.MapperScannerConfigurer -->     <bean class="tk.mybatis.spring.mapper.MapperScannerConfigurer">         <property name="basePackage" value="com.xuweiwei.mapper.mapper"/>     </bean>      <!-- 配置Service自动扫描的包 -->     <context:component-scan base-package="com.xuweiwei"/>      <!-- 配置声明式事务 -->     <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">         <property name="dataSource" ref="dataSource"/>     </bean>      <tx:annotation-driven transaction-manager="transactionManager"/> </beans>

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2.4 创建具体的通用Mapper接口

EmployeeMapper.java

package com.xuweiwei.mapper.mapper;  import com.xuweiwei.mapper.model.Employee; import tk.mybatis.mapper.common.Mapper;  /**  * @describe: 具体操作数据库的Mapper接口，需要继承通用的Mapper提供的核心接口Mapper<T>  * 其中泛型类型就是实体类的类型  * @author: 不为往事扰，余生只爱笑。  * @version: 1.0  */ public interface EmployeeMapper extends Mapper<Employee> { }

标签

MyBatis