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();  
            }  
        }  
    }  
}