今天突然想不用mybatis只用Spring来调取mysql的链接,于是这样配置了下,发现在service的实现层获取不到链接,空指针异常,问题代码是出在 connection=ds.getConnection();这句话上 这是为什么?有大佬解决下吗?
@Service
public class test_serviceIm implements test_service{
@Autowired
DataSource ds;
@Override
public String getString(int i) {
Connection connection;
ResultSet rs = null;
PreparedStatement ps = null;
String a = null;
try {
String sql="SELECT num FROM test_1 where id=?";
System.out.println(999);
connection=ds.getConnection();
connection.prepareStatement(sql);
ps.setInt(1, i);
System.out.println(1111);
while(rs.next()){
a=rs.getString("num");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return a;
}
public static void main(String[] args) {
test_serviceIm tsIm=new test_serviceIm();
System.out.println(tsIm.getString(1));
}
}
``` <!-- 整合数据源 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${jdbc.driverClassName}"></property>
<property name="url" value="${jdbc.url}"></property>
<property name="username" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>