Question

我想在完整数据库中用另一个字符串替换字符串。假设数据库名称为＆＃34; A＆＃34;它包含101个表。我想改变＆＃34; subhojit＆＃34;到＆＃34; jeet＆＃34;在所有表格的列中，如果它包含＆＃34; subhojit＆＃34;。

MySql可以吗？需要写程序吗？请回复。

Answer 1

update thetable set thecol = replace(thecol, 'subhojit', 'jeet')
where thecol like '%subhojit%';

来自here。

Answer 2

这有点粗糙和准备就绪（例如异常处理）。但希望你可以为自己的目的整理它：

DELIMITER $$

CREATE PROCEDURE `replace_value_in_all_cols`(IN i_schema varchar(250),IN i_fromVal varchar(250),IN i_toVal varchar(250), OUT o_errMessage varchar(250))
BEGIN
ALL_TEXT_COLUMNS : BEGIN

DECLARE noMoreRows boolean;
DECLARE db varchar(250);
DECLARE tbl varchar(250);
DECLARE col varchar(250);

DECLARE allTextCols CURSOR FOR
    select c.table_schema,c.table_name,c.column_name
    from information_schema.columns c
    where c.table_schema = i_schema
    and lower(data_type) in ('char','text','varchar');

DECLARE EXIT HANDLER for SQLEXCEPTION set o_errMessage := "Some error message";
declare continue handler for not found set noMoreRows := true;

open allTextCols;

  UPDATE_LOOP : loop

   fetch allTextCols
   into db,tbl,col;

   if noMoreRows then
    close allTextCols;
    leave UPDATE_LOOP;
   end if;

   SET @update_stmt:=CONCAT("UPDATE ",db,".",tbl," SET ",col," = replace(",col,",'",i_fromVal,"','",i_toVal,"');"); 
  PREPARE update_stmt FROM @update_stmt; 
  EXECUTE update_stmt; 
  DEALLOCATE PREPARE update_stmt;

  end loop UPDATE_LOOP;

 END ALL_TEXT_COLUMNS;
END$$

DELIMITER ;

然后你可以做类似的事情：

call `replace_value_in_all_cols`("A",'subhojit','jeet', @err);

如何在mysql数据库的整个表中替换另一个字符串

2 个答案: