Question

我有一个游标，用于在数据库中查找NULL列。我正在使用它来消除使用dbAMP从将此数据上载到Salesforce的NULL列。我想对此进行修改，以将结果假脱机到表中，并包括表名和列名。

declare @col varchar(255), @cmd varchar(max)

DECLARE getinfo cursor for
SELECT c.name FROM sys.tables t JOIN sys.columns c ON t.Object_ID = 
c.Object_ID
WHERE t.Name = 'Account'

OPEN getinfo

FETCH NEXT FROM getinfo into @col

WHILE @@FETCH_STATUS = 0
BEGIN
SELECT @cmd = 'IF NOT EXISTS (SELECT top 1 * FROM Account WHERE [' + @col + 
'] IS NOT NULL) BEGIN print ''' + @col + ''' end'
EXEC(@cmd)

FETCH NEXT FROM getinfo into @col
END

CLOSE getinfo
DEALLOCATE getinfo

我在修改此游标以将结果放入表中还没有成功。任何指导将不胜感激。

Answer 1

进行“打印”选择，然后插入到（具有相同列定义的tbl）。用相同的顺序创建具有相同列的表。然后将一个Insert插入yourtable（您的列，其顺序与exec（）的输出相同。将来表列中的任何更改都可能会破坏这一点。该表和查询应具有相同的列。如果您谨慎并控制选择和插入中的列顺序，则与表的列顺序无关紧要，但这仍然是一种很好的做法。

示例（使用动态sql插入表中）

if object_id('dbo.ColumnMatch','U') is not null drop table dbo.ColumnMatch;
create table dbo.ColumnMatch (
     id int identity(1,1) not null primary key
    ,column_name varchar(512)
);

declare @col varchar(256) = 'This Column Name'
declare @s varchar(max) = 'select ''' + @col + '''';

insert into ColumnMatch (column_name)
exec(@s);

select * from ColumnMatch;

不打印，而是选择并修复“插入到”语句。：）

if object_id('dbo.ColumnMatch','U') is not null drop table dbo.ColumnMatch;
create table dbo.ColumnMatch (
     id int identity(1,1) not null primary key
    ,column_name varchar(512)
);
declare @col varchar(255), @cmd varchar(max)

DECLARE getinfo cursor for
SELECT c.name FROM sys.tables t JOIN sys.columns c ON t.Object_ID = 
c.Object_ID
WHERE t.Name = 'Account'

OPEN getinfo

FETCH NEXT FROM getinfo into @col

WHILE @@FETCH_STATUS = 0
BEGIN
SELECT @cmd = 'IF NOT EXISTS (SELECT top 1 * FROM Account WHERE [' + @col + 
'] IS NOT NULL) BEGIN select ''' + @col + ''' column_name end'
Insert into ColumnMatch (column_name)
EXEC(@cmd)

FETCH NEXT FROM getinfo into @col
END

CLOSE getinfo
DEALLOCATE getinfo

select * from ColumnMatch;

从游标到表中的假脱机结果

1 个答案: