dbutil queryrunner 实现查询返回结果下划线转驼峰命名

当使用BeanListHandler时只需加上下面代码即可

QueryRunner runner=new QueryRunner(druidDataSource);
//开启驼峰映射
BeanProcessor bean = new GenerousBeanProcessor();
RowProcessor processor = new BasicRowProcessor(bean);
String sql="";
//此处Area传入列表需要的泛型
List list=runner.query(sql,new BeanListHandler(Area.class,processor))

当需要返回结果为List>时就需要我们自己写一个Handler了

此处贴出我自己写的类

import org.apache.commons.dbutils.handlers.MapListHandler;

import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Map;

/**
 * 自定义QueryRunner 处理方法
 * @author hang.zhong
 * @date 2019.7.18
 */
public class CamelMapListHandler extends MapListHandler {
    @Override
    protected Map handleRow(ResultSet rs) throws SQLException {
        Map result = new HashMap<>();
        ResultSetMetaData rsmd = rs.getMetaData();
        int cols = rsmd.getColumnCount();

        for(int i = 1; i <= cols; ++i) {
            String columnName = rsmd.getColumnLabel(i);
            if (null == columnName || 0 == columnName.length()) {
                columnName = rsmd.getColumnName(i);
            }
　　　　　　　//此处CamelUndelineUtil为一个下划线转驼峰的工具，这种工具很简单，我就不贴出来了
            result.put(CamelUndelineUtil.camel(columnName), rs.getObject(i));
        }
        return result;
    }
}

使用时

QueryRunner runner=new QueryRunner(druidDataSource);

String sql="";

List> list=runner.query(sql,new CamelMapListHandler(),null)

 

转载于:https://www.cnblogs.com/hangzhong/p/11238677.html