ORM框架之Mybatis（六）mybatis通用mapper

一、简介通用mapper

1.1 官方介绍：（官网：https://mapperhelper.github.io/docs/）

通用Mapper都可以极大的方便开发人员。可以随意的按照自己的需要选择通用方法，还可以很方便的开发自己的通用方法。

极其方便的使用MyBatis单表的增删改查。

支持单表操作，不支持通用的多表联合查询。

不是表中字段的属性必须加 @Transient 注解
通用 Mapper 不支持 devtools 热加载

1.2 代码官方托管地址：（也是刘增辉开源项目，他还开源了一个很牛的分页插件page—helper）

github地址：https://github.com/abel533/Mapper

码云地址：https://gitee.com/free/Mapper

二、通用mapper实例演示

2.1 创建项目用数据表：

首先创建数据库common_mapper（使用的是mysql数据库）

然后在该数据库下创建数据表：

CREATE TABLE `tabple_emp` (
`emp_id` int NOT NULL AUTO_INCREMENT ,
`emp_name` varchar(500) NULL ,
`emp_salary` double(15,5) NULL ,
`emp_age` int NULL ,
PRIMARY KEY (`emp_id`)
);
INSERT INTO `tabple_emp` (`emp_name`, `emp_salary`, `emp_age`) VALUES ('tom', '1254.37', '27');
INSERT INTO `tabple_emp` (`emp_name`, `emp_salary`, `emp_age`) VALUES ('jerry', '6635.42', '38');
INSERT INTO `tabple_emp` (`emp_name`, `emp_salary`, `emp_age`) VALUES ('bob', '5560.11', '40');
INSERT INTO `tabple_emp` (`emp_name`, `emp_salary`, `emp_age`) VALUES ('kate', '2209.11', '22');
INSERT INTO `tabple_emp` (`emp_name`, `emp_salary`, `emp_age`) VALUES ('justin', '4203.15', '30');

创建好之后：

2.2 创建maven项目Pro01Mapper

2.2.1配置pom文件：

<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.xiaomifeng1010.mapper</groupId><artifactId>Pro01Mapper</artifactId><version>0.0.1-SNAPSHOT</version><dependencies><dependency><groupId>tk.mybatis</groupId><artifactId>mapper</artifactId><version>4.0.0-beta3</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.9</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>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></dependencies>
</project>

注意mapper需要的依赖为：

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

2.2.2 在resources文件夹下配置spring-context.xml、mybatis-config.xml、log4j.properties、jdbc.properties

spring-context.xml配置文件：

<?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.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsdhttp://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:jdbc.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.xiaomifeng1010.mapper.mappers"/></bean><!-- 配置Service自动扫描的包 --><context:component-scan base-package="com.xiaomifeng1010.mapper.services"/><!-- 配置声明式事务 --><bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"><property name="dataSource" ref="dataSource"/></bean><aop:config><aop:advisor advice-ref="txAdvice" pointcut="execution(* *..*Service.*(..))"/></aop:config><tx:advice id="txAdvice" transaction-manager="dataSourceTransactionManager"><tx:attributes><tx:method name="get*" read-only="true"/><tx:method name="save*" rollback-for="java.lang.Exception" propagation="REQUIRES_NEW"/><tx:method name="remove*" rollback-for="java.lang.Exception" propagation="REQUIRES_NEW"/><tx:method name="update*" rollback-for="java.lang.Exception" propagation="REQUIRES_NEW"/></tx:attributes></tx:advice>
</beans>

mybatis-config.xml配置文件：

<?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>

log4j.properties配置文件：

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 %nlog4j.logger.com.mchange.v2=ERROR

jdbc.properties配置文件

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

2.3创建实体类和mapper类

package com.xiaomifeng1010.mapper.entities;import javax.persistence.Column;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;@Entity
@Table(name="tabple_emp")
public class Employee {@Id@GeneratedValue(strategy=GenerationType.IDENTITY)private Integer empId;//emp_id@Column(name="emp_name")private String empName;//emp_name@Column(name="emp_salary")private Double empSalary;//emp_salary@Column(name="emp_age")private Integer empAge;//emp_agepublic Employee() {}public Employee(Integer empId, String empName, Double empSalary, Integer empAge) {super();this.empId = empId;this.empName = empName;this.empSalary = empSalary;this.empAge = empAge;}@Overridepublic String toString() {return "Employee [empId=" + empId + ", empName=" + empName + ", empSalary=" + empSalary + ", empAge=" + empAge+ "]";}public Integer getEmpId() {return empId;}public void setEmpId(Integer empId) {this.empId = empId;}public String getEmpName() {return empName;}public void setEmpName(String empName) {this.empName = empName;}public Double getEmpSalary() {return empSalary;}public void setEmpSalary(Double empSalary) {this.empSalary = empSalary;}public Integer getEmpAge() {return empAge;}public void setEmpAge(Integer empAge) {this.empAge = empAge;}}

创建mapper类：

package com.xiaomifeng1010.mapper.mappers;import com.xiaomifeng1010.mapper.entities.Employee;import tk.mybatis.mapper.common.Mapper;/*** 具体操作数据库的Mapper接口，需要继承通用Mapper提供的核心接口：Mapper<Employee>* 泛型类型就是实体类的类型* @author Lenovo**/
public interface EmployeeMapper extends Mapper<Employee> {}

继承通用mapper接口即可，查看mapper接口源码：

通过继承mapper接口，既可以生成基本的增删改查方法。

创建service类

package com.xiaomifeng1010.mapper.services;import java.util.List;import org.apache.ibatis.session.RowBounds;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import com.xiaomifeng1010.mapper.entities.Employee;
import com.xiaomifeng1010.mapper.mappers.EmployeeMapper;import tk.mybatis.mapper.entity.Example;@Service
public class EmployeeService {@Autowiredprivate EmployeeMapper employeeMapper;public Employee getOne(Employee employeeQueryCondition) {return employeeMapper.selectOne(employeeQueryCondition);}public Employee getEmployeeById(Integer empId) {return employeeMapper.selectByPrimaryKey(empId);}public boolean isExists(Integer empId) {return employeeMapper.existsWithPrimaryKey(empId);}public void saveEmployee(Employee employee) {employeeMapper.insert(employee);}public void saveEmployeeSelective(Employee employee) {employeeMapper.insertSelective(employee);}public void updateEmployeeSelective(Employee employee) {employeeMapper.updateByPrimaryKeySelective(employee);}public void removeEmployee(Employee employee) {employeeMapper.delete(employee);}public void removeEmployeeById(Integer empId) {employeeMapper.deleteByPrimaryKey(empId);}public List<Employee> getEmpListByExample(Example example) {return employeeMapper.selectByExample(example);}public List<Employee> getEmpListByRowBounds(RowBounds rowBounds) {return employeeMapper.selectByRowBounds(null, rowBounds);}}

2.4 单元测试类，编写测试方法

package com.xiaomifeng1010.mapper.test;import java.sql.Connection;
import java.sql.SQLException;import javax.sql.DataSource;import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class MapperTest {private ApplicationContext iocContainer = new ClassPathXmlApplicationContext("spring-context.xml");@Testpublic void testDataSource() throws SQLException {DataSource dataSource = iocContainer.getBean(DataSource.class);Connection connection = dataSource.getConnection();System.out.println(connection);}}

运行后：

获取到了连接。

测试具体增删改查方法：

package com.xiaomifeng1010.mapper.test;import java.util.List;import org.apache.ibatis.session.RowBounds;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;import com.xiaomifeng1010.mapper.entities.Employee;
import com.xiaomifeng1010.mapper.services.EmployeeService;import tk.mybatis.mapper.entity.Example;
import tk.mybatis.mapper.entity.Example.Criteria;public class EmployeeMapperTest {private ApplicationContext iocContainer = new ClassPathXmlApplicationContext("spring-context.xml");private EmployeeService employeeService = iocContainer.getBean(EmployeeService.class);@Testpublic void testSelectOne() {//1.创建封装查询条件的实体类对象Employee employeeQueryCondition = new Employee(null, "bob", 5560.11, null);//2.执行查询Employee employeeQueryResult = employeeService.getOne(employeeQueryCondition);//3.打印System.out.println(employeeQueryResult);}@Testpublic void testSelect() {}@Testpublic void testSelectAll() {}@Testpublic void testSelectCount() {}@Testpublic void testSelectByPrimaryKey() {//1.提供id值Integer empId = 3;//2.执行根据主键进行的查询Employee employee = employeeService.getEmployeeById(empId);//3.打印结果System.out.println(employee);}@Testpublic void testExistsWithPrimaryKey() {//1.提供主键值Integer empId = 33;//2.执行查询boolean exists = employeeService.isExists(empId);//3.打印结果System.out.println(exists);}@Testpublic void testInsert() {//1.创建实体类对象封装要保存到数据库的数据Employee employee = new Employee(null, "emp03", 3000.00, 23);//2.执行插入操作employeeService.saveEmployee(employee);//3.获取employee对象的主键字段值Integer empId = employee.getEmpId();System.out.println("empId="+empId);}@Testpublic void testInsertSelective() {//1.创建实体类对象封装要保存到数据库的数据Employee employee = new Employee(null, "emp04", null, 23);//2.执行插入操作employeeService.saveEmployeeSelective(employee);}@Testpublic void testUpdateByPrimaryKey() {}@Testpublic void testUpdateByPrimaryKeySelective() {//1.创建用于测试的实体类Employee employee = new Employee(7, "empNewName", null, null);//2.执行更新employeeService.updateEmployeeSelective(employee);}@Testpublic void testDelete() {//1.声明实体类变量作为查询条件Employee employee = null;//2.执行删除employeeService.removeEmployee(employee);}@Testpublic void testDeleteByPrimaryKey() {//1.提供主键值Integer empId = 13;//2.执行删除employeeService.removeEmployeeById(empId);}@Testpublic void testSelectByExample() {//目标：WHERE (emp_salary>? AND emp_age<?) OR (emp_salary<? AND emp_age>?)//1.创建Example对象Example example = new Example(Employee.class);//***********************//i.设置排序信息example.orderBy("empSalary").asc().orderBy("empAge").desc();//ii.设置“去重”example.setDistinct(true);//iii.设置select字段example.selectProperties("empName","empSalary");//***********************//2.通过Example对象创建Criteria对象Criteria criteria01 = example.createCriteria();Criteria criteria02 = example.createCriteria();//3.在两个Criteria对象中分别设置查询条件//property参数：实体类的属性名//value参数：实体类的属性值criteria01.andGreaterThan("empSalary", 3000).andLessThan("empAge", 25);criteria02.andLessThan("empSalary", 5000).andGreaterThan("empAge", 30);//4.使用OR关键词组装两个Criteria对象example.or(criteria02);//5.执行查询List<Employee> empList = employeeService.getEmpListByExample(example);for (Employee employee : empList) {System.out.println(employee);}}@Testpublic void testSelectByRowBounds() {int pageNo = 3;int pageSize = 5;int index = (pageNo - 1) * pageSize;RowBounds rowBounds = new RowBounds(index, pageSize);List<Employee> empList = employeeService.getEmpListByRowBounds(rowBounds);for (Employee employee : empList) {System.out.println(employee);}}}

测试testInsert()方法：

原本5条数据，出入一条，返回id=6

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