INSETR INTO PUZZLE(CLUE1) VALUES (clue1==""?(null):(clue1))
是如果clue1为空,就当做null,插入数据库,如果不为空,那就是原来的值插入数据库
但是我试了,还是空值插入了数据库,不会显示NULL
我是在winform中写的这条命令,如果我想实现上面说的,应该怎么改呢???
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- C# code
//若clue1在数据库中的字段是数值型string insSql = "INSETR INTO PUZZLE(CLUE1) VALUES (" + clue1 == "" ? "null" :clue1 + ")";//若是字符型string insSql="INSETR INTO PUZZLE(CLUE1) VALUES ("+clue1==""?"null":"'"+clue1+"')";
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- SQL code
declare @clue1 varchar(1)insert into puzziw(clue1)select case when @clue1='' then null else @clue1 end
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InSert Into Puzzle(Clue1)
Select Case When ISNULL(clue1,'') = '' then Null Else clue1 End From 表