我正在尝试创建一个存储过程,它将根据输入返回记录。如果所有输入参数都为null,则返回整个表,否则使用参数并返回记录:
create procedure getRecords @parm1 varchar(10) = null, @parm2 varchar(10) = null, @parm3 varchar(10) = null
as
declare @whereClause varchar(500)
set @whereClause = ' where 1 = 1 '
if (@parm1 is null and @parm2 is null and @parm3 is null)
select * from dummyTable
else
begin
if (@parm1 is not null)
set @whereClause += 'and parm1 = ' + '' + @parm1 + ''
if (@parm2 is not null)
set @whereClause += 'and parm2 = ' + '' + @parm2 + ''
if (@parm3 is not null)
set @whereClause += 'and parm3 = ' + '' + @parm3 + ''
select * from dummyTable @whereClause <-- Error
end
创建此过程时出错是“在条件的上下文中指定的非布尔类型的表达式”
如果构建where子句的方法有误,请评论一下吗?
由于
答案 0 :(得分:8)
select * from dummyTable
where (parm1 = @parm1 OR @parm1 IS NULL)
and (parm2 = @parm2 OR @parm2 IS NULL)
and (parm3 = @parm3 OR @parm3 IS NULL)
;
答案 1 :(得分:5)
整个查询应该在varchar中,并且可以使用“EXEC”函数执行。
SET @query = "SELECT * FROM dummyTable WHERE 1=1 "
... your IF clauses ...
EXEC(@query)
HTH。
答案 2 :(得分:0)
尝试这样的事情:
create procedure getRecords @parm1 varchar(10) = null, @parm2 varchar(10) = null, @parm3 varchar(10) = null
as
declare @whereClause varchar(500)
declare @sql varchar(500)
set @sql = 'select * from dummyTable '
set @whereClause = ' where 1 = 1 '
if (@parm1 is null and @parm2 is null and @parm3 is null)
set @sql = @sql + @whereClause
else
begin
set @sql = @sql + @whereClause
if (@parm1 is not null)
set @sql = @sql + ' and parm1 = ' + '' + @parm1 + ''
if (@parm2 is not null)
set @sql = @sql + ' and parm2 = ' + '' + @parm2 + ''
if (@parm3 is not null)
set @sql = @sql + ' and parm3 = ' + '' + @parm3 + ''
end
exec (@sql)