一、准备数据库
创建数据库表并插入数据
CREATE DATABASE common_mapper;
USE common_mapper;
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);
二、实体类
创建JavaBean
public class Employee {
private Integer empId;
private String empName;
private Double empSalary;
private Double empAge;
public Employee() {
}
public Employee(Integer empId, String empName, Double empSalary, Double empAge) {
this.empId = empId;
this.empName = empName;
this.empSalary = empSalary;
this.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 Double getEmpAge() {
return empAge;
}
public void setEmpAge(Double empAge) {
this.empAge = empAge;
}
@Override
public String toString() {
return "Employee{" +
"empId=" + empId +
", empName='" + empName + '\'' +
", empSalary=" + empSalary +
", empAge=" + empAge +
'}';
}
}
注意:
考虑到基本数据类型在Java类中都有默认值,会导致MyBatis在执行相关操作时很难判断当前字段是否为null,所以在MyBatis环境下使用Java实体类时尽量不要使用基本数据类型,都使用对应的包装类型。
三、搭建 MyBatis+Spring 开发环境
1、添加Maven依赖
<dependencies>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<!-- ehcache 相关包-->
<dependency>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache-core</artifactId>
<version>2.6.8</version>
</dependency>
<dependency>
<groupId>org.mybatis.caches</groupId>
<artifactId>mybatis-ehcache</artifactId>
<version>1.0.3</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.6.2</version>
</dependency>
<!-- mybatis-spring 相关包-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.1</version>
</dependency>
<!-- spring 相关包-->
<!-- IOC-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>${spring-version}</version>
</dependency>
<!-- AOP -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring-version}</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.13</version>
</dependency>
<!-- 数据库相关 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${spring-version}</version>
</dependency>
<!-- springMVC 相关-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring-version}</version>
</dependency>
<!--JSTL-->
<dependency>
<groupId>org.apache.taglibs</groupId>
<artifactId>taglibs-standard-impl</artifactId>
<version>1.2.1</version>
</dependency>
<dependency>
<groupId>org.apache.taglibs</groupId>
<artifactId>taglibs-standard-spec</artifactId>
<version>1.2.1</version>
</dependency>
<!--日志相关-->
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.1.3</version>
</dependency>
<!--数据库连接池-->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.2.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
</dependencies>
2、添加 MyBatis 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>
<settings>
<setting name="cacheEnabled" value="true"/>
<setting name="mapUnderscoreToCamelCase" value="true"/>
<setting name="jdbcTypeForNull" value="NULL"/>
<setting name="lazyLoadingEnabled" value="true"/>
</settings>
<databaseIdProvider type="DB_VENDOR">
<!-- 为不同的数据库厂商起别名 -->
<property name="MySQL" value="mysql"/>
<property name="SQL Server" value="sqlserver"/>
<property name="DB2" value="db2"/>
<property name="Oracle" value="oracle" />
</databaseIdProvider>
<mappers>
<package name="com.njf.mapper.mappers"/>
</mappers>
</configuration>
3、添加日志配置文件
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 %n
log4j.logger.com.mchange.v2=ERROR
4、添加数据库连接信息
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/common_mapper?useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=root
5、添加 Spring 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:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:mybatis-sprin="http://mybatis.org/schema/mybatis-spring"
xmlns:aop="http://www.springframework.org/schema/aop"
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.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<!-- Spring 希望管理所有的业务逻辑组件,等 -->
<context:component-scan base-package="com.njf.mapper" use-default-filters="true">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<!--引入数据库的配置文件-->
<context:property-placeholder location="classpath:dbconfig.properties" />
<!-- Spring 控制业务逻辑,数据源、事务控制,aop -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="driverClass" value="${jdbc.driver}"/>
<property name="user" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<!--spring 事务管理器-->
<bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<!--开启基于注解的事务-->
<tx:annotation-driven transaction-manager="dataSourceTransactionManager"/>
<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="REQUIRED"/>
<tx:method name="update*" rollback-for="java.lang.Exception" propagation="REQUIRED"/>
</tx:attributes>
</tx:advice>
<!--
整合 mybatis
目的:
1、spring 管理所有组件,mapper 的实现类
service ===》Dao @Autowired 自动注入的 mapper
2、spring 用来管理事务,声明式事务
-->
<!--
创建出 SqlSessionFactory 对象
-->
<bean id="sessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="typeAliasesPackage" value="com.njf.mapper.bean"/>
<property name="typeAliases">
<array>
<value>com.njf.mapper.bean.Employee</value>
</array>
</property>
<!-- configLocation 指定全局配置文件的位置-->
<property name="configLocation" value="classpath:mybatis-config.xml" />
<!-- 指定mapper 文件的位置 -->
<!--<property name="mapperLocations" value="classpath:mybatis/mapper/*.xml"/>-->
</bean>
<!--
扫描所有的mapper接口的实现,让这些 mapper 能够自动注入
base-package:指定mapper接口的包名
-->
<!--<mybatis-sprin:scan base-package="com.njf.mapper.mappers"></mybatis-sprin:scan>-->
<!--老版格式-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.njf.mapper.mappers"/>
</bean>
</beans>
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