mysql处理百万数据遍历速度提升（遍历图片名字是否存在）

CREATE DEFINER=`root`@`localhost` FUNCTION `fun_wcmappendix02`(image_name VARCHAR(50)) RETURNS int(11)
BEGIN
  DECLARE sTemp LONGTEXT;
   DECLARE sTempChd LONGTEXT; ##4g

   SELECT GROUP_CONCAT(t.APPFILE) into sTemp from wcmappendix t where APPFILE not like 'http%';
   SELECT GROUP_CONCAT(img) into sTempChd from test2 where img not like 'http%';

 if  FIND_IN_SET(image_name,sTemp)>0 OR FIND_IN_SET(image_name,sTempChd)>0 THEN
   RETURN 1;
 ELSE
   RETURN 0;
 end IF;
END

　　调用

package test;
import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;
import java.sql.Types;

import com.mysql.jdbc.CallableStatement;

public class deleteImage2 {
    public static void main(String[] args) {
        Connection connection = null;
        //用于执行 SQL 存储过程的接口
        try {
            Class.forName("com.mysql.jdbc.Driver");
            String url = "jdbc:mysql://localhost:3306/gonganbao?useUnicode=true&characterEncoding=utf8&allowMultiQueries=true&tcpRcvBuf=1024000";
            String user = "root";
            String password = "123123";
            connection = DriverManager.getConnection(url, user, password);
            String sql = "{?=call fun_wcmappendix02(?)}";  

            //调用存储过程
            CallableStatement cstmt = (CallableStatement) connection.prepareCall(sql);
            cstmt.registerOutParameter(1,Types.INTEGER);
            cstmt.setString(2,"W020180109595367694267.jpg");
            cstmt.execute();
            int value = cstmt.getInt(1);
            System.out.println(value);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                    connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}