根据 Spring documentation , Spring JdbcTemplate的使用步骤如下:
<?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"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<!-- Scans within the base package of the application for @Components to configure as beans -->
<context:component-scan base-package="org.springframework.docs.test" />
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<context:property-placeholder location="jdbc.properties"/>
</beans>
然后，
@Repository
public class JdbcCorporateEventDao implements CorporateEventDao {
private JdbcTemplate jdbcTemplate;
@Autowired
public void setDataSource(DataSource dataSource) {
this.jdbcTemplate = new JdbcTemplate(dataSource);
}
// JDBC-backed implementations of the methods on the CorporateEventDao follow...
}
基本上，JdbcTemplate 是在 Component 类中使用数据源的 setter 创建的。
这样做有什么问题吗？而不是在应用程序中只有一个 jdbcTemplate 实例？
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"
p:dataSource-ref="dataSource"
/>
然后将 jdbcTemplate 本身直接注入(inject)到组件中
@Repository
public class JdbcCorporateEventDao implements CorporateEventDao {
@Resource("jdbcTemplate")
private JdbcTemplate jdbcTemplate;
// JDBC-backed implementations of the methods on the CorporateEventDao follow...
}
jdbcTemplate本身不能直接注入(inject)组件类有什么原因吗？
SGB
最佳答案
你可以做你想做的事。 The javadoc of JdbcTemplate甚至说得很清楚:
Can be used within a service implementation via direct instantiation with a DataSource reference, or get prepared in an application context and given to services as bean reference.
关于java - 使用 Spring JdbcTemplate - 注入(inject)数据源与 jdbcTemplate，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17868096/