Mybatis 快速入门
MyBatis 是支持普通 SQL 查询，存储过程和高级映射的优秀持久层框架。MyBatis 可以使用简单的 XML 或注解用于配置和原始映射，将接口和 Java 的 POJO映射成数据库中的记录.
1.创建Maven工程，编写pom.xml配置文件，引入jar
<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.self</groupId> <artifactId>mybatis</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <!--引入项目依赖的jar包 --> <!-- SpringMVC、Spring --> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.3.7.RELEASE</version> </dependency> <!--JSR303数据校验支持 --> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-validator</artifactId> <version>5.4.1.Final</version> </dependency> <!-- Spring-Jdbc --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.3.7.RELEASE</version> </dependency> <!--Spring-test --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>4.3.7.RELEASE</version> </dependency> <!-- Spring面向切面编程 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> <version>4.3.7.RELEASE</version> </dependency> <!--MyBatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.2</version> </dependency> <!-- MyBatis整合Spring的适配包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.1</version> </dependency> <!-- 数据库连接池、驱动 --> <dependency> <groupId>c3p0</groupId> <artifactId>c3p0</artifactId> <version>0.9.1</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.41</version> </dependency> <!-- junit --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> </dependencies> </project>
2.Spring整合mybatis
2.1 数据库连接信息db.properties
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/ssm?useUnicode=true&characterEncoding=UTF-8 jdbc.driverClass=com.mysql.jdbc.Driver jdbc.user=root jdbc.password=000111
2.2 mybatis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> <settings> <setting name="mapUnderscoreToCamelCase" value="true"/> </settings> <typeAliases> <package name="com.ssm.bean"/> </typeAliases> </configuration>
2.3 Spring整合
<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd"> <!-- Spring的配置文件，这里主要配置和业务逻辑有关的 --> <!--=================== 数据源，事务控制，xxx ================--> <context:property-placeholder location="classpath:db.properties" /> <bean id="pooledDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property> <property name="driverClass" value="${jdbc.driverClass}"></property> <property name="user" value="${jdbc.user}"></property> <property name="password" value="${jdbc.password}"></property> </bean> <!--================== 配置和MyBatis的整合=============== --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 指定mybatis全局配置文件的位置 --> <property name="configLocation" value="classpath:mybatis-config.xml"></property> <property name="dataSource" ref="pooledDataSource"></property> <!-- 指定mybatis，mapper文件的位置 --> <property name="mapperLocations" value="classpath:mapper/*.xml"></property> </bean> <!-- 配置扫描器，将mybatis接口的实现加入到ioc容器中 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!--扫描所有dao接口的实现，加入到ioc容器中 --> <property name="basePackage" value="com.ssm.dao"></property> </bean> <!-- ===============事务控制的配置 ================--> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <!--控制住数据源 --> <property name="dataSource" ref="pooledDataSource"></property> </bean> <!--开启基于注解的事务，使用xml配置形式的事务（必要主要的都是使用配置式） --> <aop:config> <!-- 切入点表达式 --> <aop:pointcut expression="execution(* com.ssm.service..*(..))" id="txPoint"/> <!-- 配置事务增强 --> <aop:advisor advice-ref="txAdvice" pointcut-ref="txPoint"/> </aop:config> <!--配置事务增强，事务如何切入 --> <tx:advice id="txAdvice" transaction-manager="transactionManager"> <tx:attributes> <!-- 所有方法都是事务方法 --> <tx:method name="*"/> <!--以get开始的所有方法 --> <tx:method name="get*" read-only="true"/> </tx:attributes> </tx:advice> <!-- Spring配置文件的核心点（数据源、与mybatis的整合，事务控制） --> </beans>
3.编写测试模块
3.1 JavaBean
1 package com.ssm.bean; 2 3 public class Department { 4 private Integer deptId; 5 private String deptNo; 6 7 private String deptName; 8 9 public String getDeptNo() { 10 return deptNo; 11 } 12 13 public void setDeptNo(String deptNo) { 14 this.deptNo = deptNo; 15 } 16 17 public Department() { 18 super(); 19 // TODO Auto-generated constructor stub 20 } 21 22 23 24 public Department(Integer deptId, String deptNo, String deptName) { 25 super(); 26 this.deptId = deptId; 27 this.deptNo = deptNo; 28 this.deptName = deptName; 29 } 30 31 public Integer getDeptId() { 32 return deptId; 33 } 34 35 public void setDeptId(Integer deptId) { 36 this.deptId = deptId; 37 } 38 39 public String getDeptName() { 40 return deptName; 41 } 42 43 public void setDeptName(String deptName) { 44 this.deptName = deptName == null ? null : deptName.trim(); 45 } 46 47 @Override 48 public String toString() { 49 return "Department [deptId=" + deptId + ", deptNo=" + deptNo + ", deptName=" + deptName + "]"; 50 } 51 52 53 }
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3.2 Dao层接口
1 package com.ssm.dao; 2 3 import com.ssm.bean.Department; 4 5 public interface DepartmentMapper { 6 7 8 /** 9 * 添加记录 10 * @param dept 11 * @return 12 */ 13 int insertSelective(Department dept); 14 15 16 /** 17 * 查询记录 18 * @param deptId 19 * @return 20 */ 21 Department selectByPrimaryKey(Integer deptId); 22 23 24 }
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3.3 mapper.xml映射文件
<?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"> <mapper namespace="com.ssm.dao.DepartmentMapper"> <resultMap id="BaseResultMap" type="com.ssm.bean.Department"> <id column="dept_id" jdbcType="INTEGER" property="deptId" /> <result column="dept_name" jdbcType="VARCHAR" property="deptName" /> </resultMap> <sql id="Base_Column_List"> dept_id, dept_name,dept_no </sql> <select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap"> select <include refid="Base_Column_List" /> from tbl_dept where dept_id = #{deptId,jdbcType=INTEGER} </select> <insert id="insertSelective" parameterType="com.ssm.bean.Department"> insert into tbl_dept <trim prefix="(" suffix=")" suffixOverrides=","> <if test="deptId != null"> dept_id, </if> <if test="deptNo != null"> dept_no, </if> <if test="deptName != null"> dept_name, </if> </trim> <trim prefix="values (" suffix=")" suffixOverrides=","> <if test="deptId != null"> #{deptId,jdbcType=INTEGER}, </if> <if test="deptName != null"> #{deptNo,jdbcType=VARCHAR}, </if> <if test="deptName != null"> #{deptName,jdbcType=VARCHAR}, </if> </trim> </insert> </mapper>
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3.4运行
package com.ssm.test; 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 com.ssm.bean.Department; import com.ssm.dao.DepartmentMapper; /** * 使用Spring的单元测试，自动注入需要的组件 * */ @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations={"classpath:applicationContext.xml"}) public class TestOper { @Autowired DepartmentMapper departmentMapper; /** * 查询数据 */ @Test public void testSelect(){ Department department = departmentMapper.selectByPrimaryKey(4); System.out.println(department); } /** * 新增部门 */ @Test public void testInsert(){ departmentMapper.insertSelective(new Department(null,"002", "人力资源部")); } }
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