256 lines
8.4 KiB
Markdown
256 lines
8.4 KiB
Markdown
# Spring 整合 Mybatis（XML 配置方式）
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<nav>
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<a href="#一项目说明">一、项目说明</a><br/>
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<a href="#11-项目结构">1.1 项目结构</a><br/>
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<a href="#12-项目依赖">1.2 项目依赖</a><br/>
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<a href="#二整合-Mybatis">二、整合 Mybatis</a><br/>
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<a href="#21--数据库配置">2.1 数据库配置</a><br/>
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<a href="#22--配置数据源">2.2 配置数据源</a><br/>
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<a href="#23-MyBatis-配置">2.3 MyBatis 配置</a><br/>
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<a href="#24-数据查询">2.4 数据查询</a><br/>
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<a href="#25-测试查询">2.5 测试查询</a><br/>
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</nav>
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## 一、项目说明
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#### 1.1 项目结构
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<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-mybatis.png"/> </div>
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#### 1.2 项目依赖
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除了 Spring 相关依赖外，还需要导入数据库驱动和对应的 Mybatis 依赖：
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```xml
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<!--jdbc 相关依赖包-->
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-jdbc</artifactId>
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<version>${spring-base-version}</version>
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</dependency>
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<dependency>
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<groupId>mysql</groupId>
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<artifactId>mysql-connector-java</artifactId>
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<version>8.0.13</version>
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</dependency>
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<dependency>
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<groupId>com.oracle</groupId>
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<artifactId>ojdbc6</artifactId>
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<version>11.2.0.3.0</version>
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</dependency>
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<!--mybatis 依赖包-->
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<dependency>
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<groupId>org.mybatis</groupId>
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<artifactId>mybatis-spring</artifactId>
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<version>1.3.2</version>
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</dependency>
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<dependency>
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<groupId>org.mybatis</groupId>
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<artifactId>mybatis</artifactId>
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<version>3.4.6</version>
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</dependency>
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```
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## 二、整合 Mybatis
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#### 2.1 数据库配置
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在 resources 文件夹下新建数据库配置文件 jdbc.properties：
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```properties
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# mysql 数据库配置
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mysql.driverClassName=com.mysql.jdbc.Driver
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mysql.url=jdbc:mysql://localhost:3306/mysql
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mysql.username=root
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mysql.password=root
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# oracle 数据库配置
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oracle.driverClassName=oracle.jdbc.driver.OracleDriver
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oracle.url=jdbc:oracle:thin:@//IP 地址:端口号/数据库实例名
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oracle.username=用户名
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oracle.password=密码
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```
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#### 2.2 配置数据源
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配置数据源、Mybatis 会话工厂和事务管理器：
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```xml
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<?xml version="1.0" encoding="UTF-8"?>
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
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xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
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http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
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<!-- 开启注解包扫描-->
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<context:component-scan base-package="com.heibaiying.*"/>
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<!--指定配置文件的位置-->
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<context:property-placeholder location="classpath:jdbc.properties"/>
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<!--配置数据源-->
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<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
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<!--Mysql 配置-->
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<property name="driverClassName" value="${mysql.driverClassName}"/>
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<property name="url" value="${mysql.url}"/>
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<property name="username" value="${mysql.username}"/>
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<property name="password" value="${mysql.password}"/>
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<!--Oracle 配置-->
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<!--<property name="driverClassName" value="${oracle.driverClassName}"/>
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<property name="url" value="${oracle.url}"/>
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<property name="username" value="${oracle.username}"/>
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<property name="password" value="${oracle.password}"/>-->
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</bean>
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<!--配置 mybatis 会话工厂 -->
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<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
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<property name="dataSource" ref="dataSource"/>
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<!--指定 mapper 文件所在的位置-->
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<property name="mapperLocations" value="classpath*:/mappers/**/*.xml"/>
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<property name="configLocation" value="classpath:mybatisConfig.xml"/>
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</bean>
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<!--扫描注册接口 -->
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<!--作用:从接口的基础包开始递归搜索，并将它们注册为 MapperFactoryBean(只有至少一种方法的接口才会被注册;具体类将被忽略)-->
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<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
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<!--指定会话工厂 -->
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<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
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<!-- 指定 mybatis 接口所在的包 -->
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<property name="basePackage" value="com.heibaiying.dao"/>
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</bean>
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<!--定义事务管理器-->
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<bean id="transactionManager"
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class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
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<property name="dataSource" ref="dataSource"/>
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</bean>
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<!-- 开启事务注解@Transactional 支持 -->
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<tx:annotation-driven/>
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</beans>
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```
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#### 2.3 MyBatis 配置
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新建mybtais配置文件，按照需求配置额外参数， 更多 settings 配置项可以参考 [官方文档](http://www.mybatis.org/mybatis-3/zh/configuration.html)
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```xml
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<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE configuration
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PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-config.dtd">
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<!-- mybatis 配置文件 -->
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<configuration>
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<settings>
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<!-- 开启驼峰命名 -->
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<setting name="mapUnderscoreToCamelCase" value="true"/>
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<!-- 打印查询 sql -->
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<setting name="logImpl" value="STDOUT_LOGGING"/>
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</settings>
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</configuration>
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<!--更多settings配置项可以参考官方文档: <a href="http://www.mybatis.org/mybatis-3/zh/configuration.html"/>-->
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```
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#### 2.4 数据查询
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新建查询接口及其实现类，以下示例分别查询的是 MySQL 和 Oracle 中的字典表：
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```java
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public interface MysqlDao {
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List<Relation> get();
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}
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```
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```xml
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<!DOCTYPE mapper
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PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<mapper namespace="com.heibaiying.dao.MysqlDao">
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<select id="queryById" resultType="com.heibaiying.bean.Relation">
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SELECT help_keyword_id AS id,name
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FROM HELP_KEYWORD
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WHERE HELP_KEYWORD_ID = #{id}
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</select>
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</mapper>
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```
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```mysql
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public interface OracleDao {
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List<Flow> queryById(long id);
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}
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```
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```xml
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<!DOCTYPE mapper
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PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<mapper namespace="com.heibaiying.dao.OracleDao">
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<select id="queryById" resultType="com.heibaiying.bean.Flow">
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select * from APEX_030200.WWV_FLOW_CALS where ID = #{id}
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</select>
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</mapper>
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```
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#### 2.5 测试查询
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新建测试类进行测试：
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```java
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@RunWith(SpringRunner.class)
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@ContextConfiguration({"classpath:springApplication.xml"})
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public class MysqlDaoTest {
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@Autowired
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private MysqlDao mysqlDao;
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@Test
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public void get() {
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List<Relation> relations = mysqlDao.get();
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if (relations != null) {
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for (Relation relation : relations) {
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System.out.println(relation.getId() + " " + relation.getName());
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}
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}
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}
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}
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```
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```java
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@RunWith(SpringRunner.class)
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@ContextConfiguration({"classpath:springApplication.xml"})
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public class OracleDaoTest {
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/*注入接口时: 如果接口有多个实现类 可以用这个注解指定具体的实现类*/
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@Qualifier("oracleDaoImpl")
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@Autowired
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private OracleDao oracleDao;
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@Test
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public void get() {
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List<Flow> flows = oracleDao.get();
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if (flows != null) {
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for (Flow flow : flows) {
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System.out.println(flow.getId() + " " + flow.getPlugId());
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}
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}
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}
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}
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```
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