MySql存储过程是带参数的存储过程(动态执行SQL语句)

  下文介绍的MySql存储过程是带参数的存储过程(动态执行SQL语句),该MySql存储过程是根据用户输入的条件和排序方式查询用户的信息,排序条件可以没有调用方式:
  call GetUsersDynamic('age<=30','');
  /********动态查询用户的信息********/
  CREATE PROCEDURE GetUsersDynamic(WhereCondition varchar(500),OrderByExpress varchar(100))
  begin
  declare stmt varchar(2000);
  if LENGTH(OrderbyExpress)>0 then
  beginhttps://www.weixiu3721.com
  set sqlstr=concat('select id,name,password,age,getdate(adddate)as AddDate from users where',WhereCondition,'order by',OrderByExpress);
  end;
  else
  begin
  set sqlstr=concat('select id,name,password,age,getdate(adddate)as AddDate from users where',WhereCondition);
  end;
  end if;
  prepare stmt from sqlstr;
  execute stmt;
  end;
  getdate()是一个自定义的函数,作用是返回日期的短格式
  CREATE DEFINER=`root` `localhost`FUNCTION`getdate`($date datetime)RETURNS varchar(50)CHARSET latin1
  return date_format($date,'%Y-%m-%d');
  动态插入数据的MySql存储过程,(注意四个单引号表示一个一引号):
  CREATE DEFINER=`root` `localhost`PROCEDURE`InsertUser`(in name2 varchar(50),in password2 varchar(32),in age2 int,in adddate2 datetime)
  begin
  DECLARE stmt varchar(2000);
  set sqlstr=concat('insert into users(name,password,age,adddate)values(');
  set sqlstr=concat( sqlstr,'''',name2,'''',',','''',password2,'''',',',age2,',','''',adddate2,'''',')');
  prepare stmt from sqlstr;
  execute stmt;
  end;

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