我有一个存储过程来插入记录并返回插入记录的 ID。
这是我的 SQL 实现:
ALTER PROCEDURE InsertViolation
@FactoryName nvarchar(50) ,
@Type nvarchar(100),
@Location nvarchar(30) ,
@Desc nvarchar(300),
@Severity nvarchar(300),
@DateObserved datetime,
@ViolationNumber bigint output
AS
BEGIN
SET NOCOUNT ON;
INSERT INTO Violation
(Violation_Factory_Name
,Violation_Type
,Violation_Location
,Violation_Desc
,Violation_Severity
,Violation_Date_Observed)
VALUES
(@FactoryName
,@Type
,@Location
,@Desc
,@Severity
,@DateObserved)
SET @ViolationNumber=SCOPE_IDENTITY()
RETURN @ViolationNumber
END
我有这个 C# 代码来调用这个过程:
public static long Insert_Violation(Model.Violation violation)
{
string strStoredProcedureName = "InsertViolation";
SqlCommand cmd = new SqlCommand(strStoredProcedureName);
string strConnString = ConfigurationManager.ConnectionStrings["ViolationConnection"].ConnectionString;
SqlConnection con = new SqlConnection(strConnString);
cmd.Connection = con;
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@FactoryName", violation.FactoryName);
cmd.Parameters.AddWithValue("@Type", violation.ViolationType);
cmd.Parameters.AddWithValue("@Location", violation.Location);
cmd.Parameters.AddWithValue("@Desc", violation.ViolationDesc);
cmd.Parameters.AddWithValue("@Severity", violation.Serverity);
cmd.Parameters.AddWithValue("@DateObserved", violation.DateObserved);
cmd.Parameters.AddWithValue("@ViolationNumber", -1).Direction = ParameterDirection.Output;
try
{
con.Open();
cmd.ExecuteNonQuery();
return (long) cmd.Parameters["@ViolationNumber"].Value;
}
catch(Exception ex)
{
throw new Exception(ex.Message + " Date Parameter value is " + cmd.Parameters["@DateObserved"].Value + " \n DateTime Object converted to string value is " + violation.DateObserved.ToString());
return -1;
}
finally
{
con.Dispose();
cmd.Dispose();
}
}
我发现该行已插入数据库但抛出异常 cmd.ExecuteNonQuery();
的问题是我使用的violation.DateObserved
是 C#DateTime
对象并且 DB 中的相应参数和字段是类型datetime
这是捕获的异常消息,我使用 throw exception 来打印它:
System.Exception:指定的强制转换无效。Date 参数值是 15/12/2012 12:00:00 DateTime 对象转换为字符串值是 15/12/2012 12:00:00
所以我无法获得记录号,而是在访问捕获时我的函数返回 -1。