执行Insert命令，在Sql中返回插入的Id
执行Insert命令，在Sql中返回插入的Id
提问于 2013-08-22 14:46:34
我正在使用MVC4中的C#将一些值插入到SQL表中。实际上，我想插入值并返回最后插入的记录的“ID”。我使用以下代码。
public class MemberBasicData
{
public int Id { get; set; }
public string Mem_NA { get; set; }
public string Mem_Occ { get; set; }
}插入时，ID会在数据库中自动递增。
public int CreateNewMember(string Mem_NA, string Mem_Occ )
{
using (SqlConnection con=new SqlConnection(Config.ConnectionString))
{
using(SqlCommand cmd=new SqlCommand("INSERT INTO Mem_Basic(Mem_Na,Mem_Occ) VALUES(@na,@occ)",con))
{
cmd.Parameters.AddWithValue("@na", Mem_NA);
cmd.Parameters.AddWithValue("@occ", Mem_Occ);
con.Open();
int modified = cmd.ExecuteNonQuery();
if (con.State == System.Data.ConnectionState.Open) con.Close();
return modified;
}
}
}我知道ExecuteNonQuery表示影响行的数字。而不是我使用的
int modified = (int)cmd.ExecuteScalar();但它不起作用。请帮我解决这个问题。有没有像cmd.ExecuteInsertAndGetID()这样的代码(不适用于我的代码)。
回答 5
Stack Overflow用户
发布于 2013-08-22 14:50:05
将查询更改为
"INSERT INTO Mem_Basic(Mem_Na,Mem_Occ) VALUES(@na,@occ); SELECT SCOPE_IDENTITY()"这将返回最后插入的ID，然后可以使用ExecuteScalar获取该ID
Stack Overflow用户
发布于 2013-08-22 15:50:21
SQL Server存储过程：
CREATE PROCEDURE [dbo].[INS_MEM_BASIC]
@na varchar(50),
@occ varchar(50),
@New_MEM_BASIC_ID int OUTPUT
AS
BEGIN
SET NOCOUNT ON;
INSERT INTO Mem_Basic
VALUES (@na, @occ)
SELECT @New_MEM_BASIC_ID = SCOPE_IDENTITY()
ENDC#代码：
public int CreateNewMember(string Mem_NA, string Mem_Occ )
{
// values 0 --> -99 are SQL reserved.
int new_MEM_BASIC_ID = -1971;
SqlConnection SQLconn = new SqlConnection(Config.ConnectionString);
SqlCommand cmd = new SqlCommand("INS_MEM_BASIC", SQLconn);
cmd.CommandType = CommandType.StoredProcedure;
SqlParameter outPutVal = new SqlParameter("@New_MEM_BASIC_ID", SqlDbType.Int);
outPutVal.Direction = ParameterDirection.Output;
cmd.Parameters.Add(outPutVal);
cmd.Parameters.Add("@na", SqlDbType.Int).Value = Mem_NA;
cmd.Parameters.Add("@occ", SqlDbType.Int).Value = Mem_Occ;
SQLconn.Open();
cmd.ExecuteNonQuery();
SQLconn.Close();
if (outPutVal.Value != DBNull.Value) new_MEM_BASIC_ID = Convert.ToInt32(outPutVal.Value);
return new_MEM_BASIC_ID;
}我希望这些能对你有所帮助……
如果你想的话你也可以使用这个。
public int CreateNewMember(string Mem_NA, string Mem_Occ )
{
using (SqlConnection con=new SqlConnection(Config.ConnectionString))
{
int newID;
var cmd = "INSERT INTO Mem_Basic(Mem_Na,Mem_Occ) VALUES(@na,@occ);SELECT CAST(scope_identity() AS int)";
using(SqlCommand cmd=new SqlCommand(cmd, con))
{
cmd.Parameters.AddWithValue("@na", Mem_NA);
cmd.Parameters.AddWithValue("@occ", Mem_Occ);
con.Open();
newID = (int)insertCommand.ExecuteScalar();
if (con.State == System.Data.ConnectionState.Open) con.Close();
return newID;
}
}
}Stack Overflow用户
发布于 2013-08-22 14:52:51
USE AdventureWorks2012;
GO
IF OBJECT_ID(N't6', N'U') IS NOT NULL
DROP TABLE t6;
GO
IF OBJECT_ID(N't7', N'U') IS NOT NULL
DROP TABLE t7;
GO
CREATE TABLE t6(id int IDENTITY);
CREATE TABLE t7(id int IDENTITY(100,1));
GO
CREATE TRIGGER t6ins ON t6 FOR INSERT
AS
BEGIN
INSERT t7 DEFAULT VALUES
END;
GO
--End of trigger definition
SELECT id FROM t6;
--IDs empty.
SELECT id FROM t7;
--ID is empty.
--Do the following in Session 1
INSERT t6 DEFAULT VALUES;
SELECT @@IDENTITY;
/*Returns the value 100. This was inserted by the trigger.*/
SELECT SCOPE_IDENTITY();
/* Returns the value 1. This was inserted by the
INSERT statement two statements before this query.*/
SELECT IDENT_CURRENT('t7');
/* Returns value inserted into t7, that is in the trigger.*/
SELECT IDENT_CURRENT('t6');
/* Returns value inserted into t6. This was the INSERT statement four statements before this query.*/
-- Do the following in Session 2.
SELECT @@IDENTITY;
/* Returns NULL because there has been no INSERT action
up to this point in this session.*/
SELECT SCOPE_IDENTITY();
/* Returns NULL because there has been no INSERT action
up to this point in this scope in this session.*/
SELECT IDENT_CURRENT('t7');
/* Returns the last value inserted into t7.*/页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/18373461
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