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使用jdbcTemplate操控数据库结果出现如下错误:
错误代码如下
package cn.com.compent;
import java.util.List;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.support.rowset.SqlRowSet;
import cn.com.bean.Port;
public class TemplateJDBC {
/*author:命运的信徒
* date:2019/02/27
* arm:通过templatjdbc来操控数据库
*/
public static void main(String[] args) {
select();
}
public static void select(){
JdbcTemplate jt=new JdbcTemplate();
String sql="select * from Port";
RowMapper<Port> rowMapper=new BeanPropertyRowMapper<Port>(Port.class);
Port li=jt.queryForObject(sql, rowMapper);
System.out.println(li.toString());
}
}
错误原因:
没有加载spring的配置文件容器
正确代码如下
package cn.com.compent;
import java.util.List;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import cn.com.bean.Port;
public class TemplateJDBC {
/*author:命运的信徒
* date:2019/02/27
* arm:通过templatjdbc来操控数据库
*/
public static void main(String[] args) {
select();
}
public static void select(){
ApplicationContext ioc=new ClassPathXmlApplicationContext("applicationContext.xml");
JdbcTemplate jt=(JdbcTemplate) ioc.getBean("jdbcTemplate");
String sql="select * from Port";
RowMapper<Port> rowMapper=new BeanPropertyRowMapper<Port>(Port.class);
List<Port> li=(List<Port>) jt.queryForObject(sql, rowMapper);
for (Port port : li) {
System.out.println(port.toString());
}
}
}