I don't think so. I'm afraid you'd better use int? instead of int. Or pleasse tell me what value in fact does the int contain if it's null?2)Your error is that DBNull……, Yes, in fact, DBNull is quite different from null in C# between SQL Server. So I suggest you us...
This behaviour has nothing to do with the platform, NULLs behave similar in MSSQL and MySQL in this respect. ... There's something else: IF statements in MySQL are blocks. You should end an IF using an END IF: IF l_UserID IS NULL ...
it will return the expression value after conversion. If an error occurs, it will return NULL va...
Check if a string is null or empty in XSLT 多条件查询 string.Format("/root/deviceList//item/guid[{0}]", strBuilder.ToString()) "/root/deviceList//item/guid[text()=\"h\" or text()=\"a\" or text()=\"c\"]"谓词嵌套var nodes = xmlDoc.SelectNodes(string.Format("/root/device...
In Java, an int is a primitive data type and cannot be null. However, you can use the Integer class to wrap an int value and set it to null. To check if an Integer is null, you can use the following code: Integer number = null; if (number == null) { // number is null } ...
I know for a fact that the SQL statement below returns NULL but my code statement "if (obj != null)" is not working. When I debug it I see a value of {} ... not sure what that is. Here is my code: x_c-sharp复制 protected string GetLatestTimeStamp() { DateTime latestTim...
SQL Server Query IF exist check issueNote that theONclause must contain only the joining conditions...
下面的 Transact-SQL 示例创建一个新表,然后通过将 CHECK 约束添加到 CreditRating 列来修改此表。 IF OBJECT_ID ('dbo.Vendors', 'U') IS NOT NULL DROP TABLE dbo.Vendors; GO CREATE TABLE dbo.Vendors (VendorID int PRIMARY KEY, VendorName nvarchar (50), CreditRating tinyint) GO ALTER TABLE db...
SQL Server Check if a variable is equal to one or more valuesPerhapsexists
OK thanks for the adivice, but still how do I simulate testing for NULL, as in: IF Number IS NULL BEGIN SET Number = 0; END IF; This does not work, syntax error. Though it does work in MSSQL. Thanks in advance. Sorry, you can't reply to this topic. It has been closed....