Mybatis——整合SpringMVC详解编程语言

之前我们在写mybatis-config.xml的时候是这么写的

    <environments default="MyBatisLearning"> 
        <environment id="MyBatisLearning"> 
<!--            配置当前环境的事务管理--> 
            <transactionManager type="JDBC"></transactionManager> 
<!--            数据源，也就是要跟哪个数据库链接--> 
            <dataSource type="POOLED"> 
                <property name="driver" value="com.mysql.jdbc.Driver"/> 
                <property name="url" value="jdbc:mysql://localhost:3306/tx"/> 
                <property name="username" value="root"/> 
                <property name="password" value="root"/> 
            </dataSource> 
        </environment> 
    </environments> 

当整合了SpringMVC之后，我们就可以用xml或注解（推荐）的方式

/** 
  * 配置数据源 
*/ 
@Configuration 
public class DataSourceConfig {
    
    @Value("${DataSource}") 
    private String DataSource; 
 
    @Bean(name = "dataSource") 
    public DataSource dataSource() {
    
        return DataSourceBuilder.build(); 
    } 
} 

/** 
  * 根据数据源配置事务管理器 
*/ 
@Configuration 
public class TransactionManagerConfig {
    
    @Bean(name="TransactionManager") 
    public PlatformTransactionManager TransactionManager(@Qualifier("dataSource") DataSource dataSource) {
    
        return new DataSourceTransactionManager(dataSource); 
    } 
} 

/** 
  * 根据数据源配置Mybatis 
  * MapperScan注解可以帮助配置mapper.xml需要扫描的DAO，具体的sqlSessionFactory和sqlSessionTemplate 
  * 注意用这种方式，sqlSessionFactory是使用SqlSessionFactoryBean来帮忙创建的 
*/ 
@Configuration 
@MapperScan(basePackages = "com.test.dao", sqlSessionFactoryRef = "sqlSessionFactory", sqlSessionTemplateRef = "sqlSessionTemplate") 
public class MyBatisConfig {
    
 
    @Bean(name = "sqlSessionFactory") 
    public SqlSessionFactory sqlSessionFactory(DataSource dataSource, 
                                                @Value("classpath:mybatis/mybatis-config.xml") Resource configLocation) throws Exception {
    
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean(); 
        sqlSessionFactoryBean.setDataSource(dataSource); 
        sqlSessionFactoryBean.setConfigLocation(configLocation); 
        return sqlSessionFactoryBean.getObject(); 
    } 
 
    @Bean(name = "sqlSessionTemplate") 
    public SqlSessionTemplate sqlSessionTemplate(SqlSessionFactory sqlSessionFactory) {
    
        return new SqlSessionTemplate(sqlSessionFactory); 
    } 
}