我们msgdate在我的表中取一个字段private_message。我们将数据类型定义为msgdateas datetime。
当我们插入数据时，该字段msgdate存储0000-00-00 00:00:00的不是当前日期。
$Query = "INSERT INTO private_message (id, sender, msgdate) VALUES ($_POST['id'],$_POST['to'], now()";
$Res = mysql_query($Query);
you sure this works ?
"INSERT INTO private_message (id, sender, msgdate) VALUES ($_POST['id'],$_POST['to'], now()"
or should it be :
INSERT INTO private_message (id, sender, msgdate) VALUES ($_POST['id'],$_POST['to'], now())"
just a parenthesis has been missed
INSERT INTO private_message (id, sender, msgdate) VALUES ($_POST['id'],$_POST['to'], **OneOfTheseFunctions**)
replace OneOfTheseFunctions with on of these three statements:
There are three ways to retrieve the current datetime in SQL SERVER.
CURRENT_TIMESTAMP, GETDATE(), {fn NOW()}
CURRENT_TIMESTAMP
CURRENT_TIMESTAMP is a nondeterministic function. Views and expressions that reference this column cannot be indexed. CURRENT_TIMESTAMP can be used to print the current date and time every time that the report is produced.
GETDATE()
GETDATE is a nondeterministic function. Views and expressions that reference this column cannot be indexed. GETDATE can be used to print the current date and time every time that the report is produced.
{fn Now()}
The {fn Now()} is an ODBC canonical function which can be used in T-SQL since the OLE DB provider for SQL Server supports them. {fn Now()} can be used to print the current date and time every time that the report is produced.
If you run following script in Query Analyzer. I will give you same results. If you see execution plan there is no performance difference. It is same for all the three select statement.
SELECT CURRENT_TIMESTAMP
GO
SELECT {fn NOW()}
GO
SELECT GETDATE()
GO
dont worry, all of them are equal in function and performance!