标签: sqlcommand

以下哪种方法更适合关闭SqlDataReader:

 SqlDataReader reader = comm.ExecuteReader();

 while (reader.Read())
 {
 }
 reader.Close();
 reader.Dispose();

要么

SqlDataReader reader = comm.ExecuteReader(CommandBehavior.CloseConnection);
while (reader.Read())
{
}

或者还有另一种关闭方法？

这就是我在想的......

Dim myCommand as SqlCommand
Dim myTable as New xsdObject.ObjectDataTable

myCommand = DataAccess.GetSQLCommand( "MyStoredProc", _
                       CommandType.StoredProcedure, SourceServer.ConnectionLocal)

myCommand.Connection.ChangeDatabase("MyDatabase")
myCommand.Parameters.AddWithValue("@Parameter", DataValue)

ExecuteSQLCommand(myCommand, myTable)

 'How to access my data ?

我有一个使用以下方法的WebService:

    [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
    [WebMethod]
    public string Login(string passwort, string email, string firma)
    {
        return LoginHelper.Login(passwort, email, firma);
    }

我的LoginHelper代码:

    using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlClient;

namespace WebService1
{
    public class LoginHelper
    {
        public static string Login(string passwort, string email, string firma)
        {
            string userName = "";

            SqlConnection con = new SqlConnection(@"Data Source=Yeah-PC\SQLEXPRESS;Initial Catalog=works;Integrated Security=true;");

        SqlCommand cmd = new SqlCommand(@"SELECT firma FROM TestData 
                                  WHERE email = @email", con);
        cmd.Parameters.AddWithValue("@email", email);

        con.Open();

        SqlDataReader dr = …

我有以下vb.net函数,它在sql命令文本中有一个语法错误,我似乎无法弄清楚

Private Sub addsupporderidsinbookedtoinprocess()
        Try
            Dim cnn3 As New SqlConnection(connetionString)
            Dim sqlcmd3 As New SqlCommand("SELECT supporderidinprocess FROM ordersinprocess", cnn3)
            sqlcmd3.CommandText = "INSERT INTO ordersinprocess(supporderidinprocess) VALUES(SELECT IDENT_CURRENT('[supporder]'))"
            cnn3.Open()
            sqlcmd3.ExecuteNonQuery()
            sqlcmd3.Parameters.Clear()
            cnn3.Close()
        Catch ex As SqlException
            MsgBox(ex.Message)
        End Try
    End Sub

错误在这部分

...VALUES(SELECT IDENT_CURRENT('[supporder]'))

任何想法如何解决这个问题？

您好我在运行SqlConnection的类中有这个代码:

using System.Data.SqlClient;
using System.IO;

namespace tours
{
    class myConnection
    {
        public static SqlConnection GetConnection()
        {
                string path = "C:\\Users\\marek\\Documents\\Visual Studio 2012\\Projects\\tours\\tours\\sql_string.txt";
                StreamReader sr = new StreamReader(File.Open(path, FileMode.Open));

                string str = "Data Source='" + sr.ReadLine() + "';Initial Catalog ='" + sr.ReadLine() + "' ;User ='" + sr.ReadLine() + "';Password = '" + sr.ReadLine() + "'";

                SqlConnection spojeni = new SqlConnection(str);
                spojeni.Open();
                return spojeni;
        }
    }
}

在其他形式我得到SqlCommand或SqlDataAdapter我需要添加到他们SqlConnection,但不知道我怎么能访问它们？你能告诉我什么吗？例如:

DataTable dt = new DataTable();
SqlDataAdapter SDA …

我正在尝试dd-MM-yyyy在c#中以格式插入日期.查询插入是

SqlCommand cmd_cust = new SqlCommand(@"insert into custdetail values ('" + txtInvoiceNo.Text + "','" + txtCustomerName.Text + "','" + txt_contact.Text + "', '" + txtAddress.Text + "', '" + txt_total_amt.Text + "', '" + dt_date.Value.ToString("dd-MM-yyyy") + "')", con_create);
            con_create.Open();
            cmd_cust.ExecuteNonQuery();
            con_create.Close();

我创建了一个列名为date的表具有datatype date.插入记录后,日期列字段中的值为yyyy-dd-MM格式.我希望这种dd-MM-yyyy格式.

我真的不知道我的Insert语句有什么问题,它包含了未处理的用户代码.与其他在线教程相比,我在cmd上的插入看起来很好.

public void retrieveData()
{
    SqlConnection(ConfigurationManager.ConnectionStrings[sqlconnectiostring].ToString())
    SqlConnection conn = new SqlConnection();

    try
    {
        using (conn = new SqlConnection(sqlconnectiostring))
        {
            conn.Open();
            SqlCommand cmd = new SqlCommand("INSERT INTO FRUITSPRODUCT(@PRODUCTNAME,@PRODUCTTYPE,@Total) VALUES (@PRODUCTNAME,@PRODUCTTYPE,@Total)",conn);
            cmd.Parameters.AddWithValue("@PRODUCTNAME","atlegang");
            cmd.Parameters.AddWithValue("@PRODUCTTYPE","baby");
            cmd.Parameters.AddWithValue("@Total","10");
            cmd.ExecuteNonQuery();
        }
    }
    catch (Exception ex)
    {
        throw ex;
    }
    finally
    {
        if (conn != null)
        {
            conn.Close();
        }
    }
}

大家好我有这个代码

cmd = new SqlCommand();
cmd.Connection = baglanti;

cmd.CommandText = "(musteriadi,musterisoyadi,gsm,email,sirketadi,Adres,Notlar) VALUES('" + txtMusteriAdi.Text.Trim() + "','" + txtMusteriSoyadi.Text.Trim() + "','" + txtGsm.Text.Trim() + "','" +txtEmail.Text.Trim() + "','" +txtSirketAdi.Text.Trim() + "','" +txtAdres.Text.Trim() + "','" +txtNotlar.Text.Trim() +"');";
baglanti.Open();
cmd.ExecuteNonQuery();

baglanti.Close();

我将cmd定义为a,public SqlCommmand并且在每次代码到达时cmd.ExecuteNonQuery()它都会抓住我能做什么.

我有这些陈述:

SqlCommand sqlcmd = new SqlCommand("some query", "some db connection");
sqlcmd.ExecuteNonQuery();

执行此查询时,如何从数据库中获取消息？

例如,如果2行受到影响,我想要SQL Server消息说:

 1 row(s) affected
 1 row(s) affected

在C#代码中.或者,例如,如果与主键发生冲突,我的意思是我试图插入存在主键的行,我希望收到数据库错误消息,其中显示:"主键重复".

当我使用SqlCommand.ExecuteNonQuery()它并且它CommandText有GO(提交)它时,我得到一个SQLException.

我删除它,SQL工作,但整个SQL有很多语句,我想在每个语句运行后提交.而且我不想将它们分成多个SqlCommand对象.

有没有更好的解决方案来保持提交和保持一个独特的SqlCommand对象？