JDBC方式执行SQL,支持CRUD返回LIST

背景:

用惯了Mybatis,接收一个老项目使用Hibernate,特别不习惯。新的功能需要系统后台定时执行任务,顾使用JDBC封装工具类执行

 

源代码

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.ytforever.listener.ResourceManager;

/**
 * 使用JDBC连接数据库,处理系统自动执行任务等 特点: 直接执行sql,返回List<Map<字段名,值>>
 * 
 * @author ZhangLi
 * @date 2018年3月2日 下午2:57:58
 */
public class JDBCUtil {
    private static String sql;

    public static List<Map<String, Object>> selectRS(String sql) {
        JDBCUtil.sql = sql;
        return selectRS();
    }

    public static List<Map<String, Object>> selectRS() {
        ArrayList<Map<String, Object>> rsList = new ArrayList<Map<String, Object>>();
        Map<String, Object> rsMap = null;
        Connection conn = null;
        PreparedStatement stmt = null;
        ResultSet rs = null;
        try {
            conn = JDBCUtil.getConnection("detection1", "detection1");
            conn.setAutoCommit(false);
            stmt = conn.prepareStatement(sql);
            rs = stmt.executeQuery();
            ResultSetMetaData rsmd = rs.getMetaData();// 取得数据库的列名
            int numberOfColumns = rsmd.getColumnCount();
            while (rs.next()) {
                rsMap = new HashMap<String, Object>(numberOfColumns);
                for (int i = 1; i < numberOfColumns + 1; i++) {
                    rsMap.put(rsmd.getColumnName(i), rs.getObject(i));
                }
                rsList.add(rsMap);
            }
            conn.commit();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (rs != null)
                    rs.close();
                if (stmt != null)
                    stmt.close();
                if (conn != null)
                    conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }

        }
        return rsList;
    }
/**
* 连接Oracle数据库
*/
public static Connection getConnection(String user, String password) {
        Connection con = null;
        try {
            Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
            con = DriverManager.getConnection(
                    "jdbc:oracle:thin:@localhost:1521/orcl", user, password);
            return con;
        } catch (SQLException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }

    public static void main(String[] args) {
        String sql = String.format("select * from V_ITEM t  where t.product_code='%s' and t.procedure_code='%s' and form_id is not null","YQ","2");
        List<Map<String, Object>> selectRS = JDBCUtil.selectRS(sql);
        for (Map<String, Object> map : selectRS) {
            map.get("FORM_ID");
        }
    }

}

特点:

1、特别方便

2、习惯写Sql的程序员看着特别亲切

3、转换为List之后,返回前台Json,前台人员也很舒服

 

于2018-03-02 16:05完成于西安逸翠园二期2号楼2单元

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欢迎同仁联系,拍砖。

 

posted @ 2018-03-02 16:07  章力  阅读(1786)  评论(0编辑  收藏  举报