如果用戶單擊按鈕，則使用c＃通過asp.net在數據庫中創建數據庫表，怎么辦？

Question

我的問題是，如果用戶單擊按鈕（例如，放置在default.aspx中的按鈕），則在數據庫（SQL Express）中創建數據庫表，該怎么辦？

我已經嘗試過，但是在調試過程中發生了錯誤，錯誤是：

1. the best overloaded method match for 'system.data.odbc.odbc command.odbc command(string,system.data.odbc.odbc connection)'has some invalid arguments.
2. Argument'2':cannot convert from 'system.data.sqlclient.sqlconnection' to 'system.data.odbc.odbc connection'.

按鈕后面（例如，按鈕放置在default.aspx中）用c＃編寫的代碼為：

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
//using PractiseWeb.DataSet1TableAdapters;
using System.Collections.Generic;
using System.Data.OleDb;
using System.Diagnostics;
using System.ComponentModel;
using System.Text;
using System.Data.SqlClient;
using System.Data.Odbc;
using ADOX;
using ADODB;

public partial class _Default : System.Web.UI.Page 
{
      SqlConnection conn;
      OdbcCommand cmd;
    string connectionString = ConfigurationManager.ConnectionStrings["gameConnectionString"].ConnectionString;
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        try 
{

   conn = new SqlConnection(connectionString);
  if (!(conn.State == ConnectionState.Open)) 
    { 
        conn.Open(); 
    } 
    string sql = "CREATE TABLE mySchoolRecord(StudentId INTEGER CONSTRAINT PkeyMyId PRIMARY KEY,"
    + "Name CHAR(50)," + "Address CHAR(255)," + "Contact INTEGER));"; 
    cmd = new OdbcCommand(sql,conn);// in this line above two errors occurred
    cmd.ExecuteNonQuery(); 

    sql = "INSERT INTO mySchoolRecord (StudentId, Name,Address,Contact) VALUES (1, 'Mr. Manish', " + " 'Sector-12,Noida', 2447658  );";
    cmd = new OdbcCommand(sql,conn);// in this line above two errors occurred
    cmd.ExecuteNonQuery(); 

    sql = "INSERT INTO mySchoolRecord (StudentId, Name,Address,Contact) VALUES (2, 'Mr. Ravi', " + " 'New Delhi', 2584076521   );"; 
    cmd = new OdbcCommand(sql,conn);// in this line above two errors occurred
    cmd.ExecuteNonQuery();

    sql = "INSERT INTO mySchoolRecord (StudentId, Name,Address,Contact) VALUES (3, 'Mr. Peter', " + " 'United States', 25684124  );"; 
    cmd = new OdbcCommand(sql,conn);// in this line above two errors occurred
    cmd.ExecuteNonQuery(); 


    if (conn.State == ConnectionState.Open) 
    { 
        conn.Close(); 
    } 

} 
catch (OdbcException ex) 
{ 
   Console.WriteLine(ex); 
} 

    }
}

Answer 1

using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.Data.SqlClient;

    public object connection()
    {
        SqlConnection myConnectionString = new SqlConnection("Data Source=(local)\\SQLEXPRESS;Initial Catalog=master;Integrated Security=True;Pooling=False");
        double[] a = new double[6];
        string myCommand = null;
        myCommand = "CREATE database soft_billing";
        SqlCommand cmd = new SqlCommand(myCommand, myConnectionString);
        try {
            for (int k = 0; k <= 4; k++) {
                a(k) = 0.0;
            }
            cmd.Connection.Open();
            cmd.ExecuteNonQuery();
            t.Enabled = true;
            t.Interval = 10;
            ProgressBar1.Value = 0;

            cmd.Connection.Close();

        } catch {
            Interaction.MsgBox(" Already installed database", MsgBoxStyle.Critical, " MaS InfoTech- Warning");

        }
        try {
            SqlConnection cn = new SqlConnection("Data Source=(local)\\SQLEXPRESS;Initial Catalog=soft_billing;Integrated Security=True;Pooling=False");
            string sql = null;
            sql = "CREATE TABLE customer(cus_name varchar(50) NULL,address varchar(50) NULL,mobno numeric(18, 0) NULL,tin varchar(50) NULL,kg varchar(50) NULL)";
            cmd = new SqlCommand(sql, cn);
            // , connection);
            cmd.Connection.Open();
            cmd.ExecuteNonQuery();
            cmd.Connection.Close();

        } catch {
            Interaction.MsgBox(" Already installed database", MsgBoxStyle.Critical, " MaS InfoTech- Warning");

        }
    }

Answer 2

您正在混合使用ADO（SQLConnection）和ODBC（ODBCCommand）。 如果使用的是SQL Server，請改用SQLCommand；否則請使用ODBCCommand 。 您不能將兩者混在一起。

Answer 3

嘗試這個

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
//using PractiseWeb.DataSet1TableAdapters;
using System.Collections.Generic;
using System.Data.OleDb;
using System.Diagnostics;
using System.ComponentModel;
using System.Text;
using System.Data.SqlClient;
using System.Data.Odbc;
using ADOX;
using ADODB;

public partial class _Default : System.Web.UI.Page 
{
      SqlConnection conn;
      OdbcCommand cmd;
    string connectionString = ConfigurationManager.ConnectionStrings["gameConnectionString"].ConnectionString;
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        try 
{

   conn = new SqlConnection(connectionString);
  if (!(conn.State == ConnectionState.Open)) 
    { 
        conn.Open(); 
    } 
    string sql = "CREATE TABLE mySchoolRecord(StudentId INTEGER CONSTRAINT PkeyMyId PRIMARY KEY,"
    + "Name CHAR(50)," + "Address CHAR(255)," + "Contact INTEGER));"; 
    cmd = new SqlCommand(sql,conn);// in this line above two errors occurred
    cmd.ExecuteNonQuery(); 

    sql = "INSERT INTO mySchoolRecord (StudentId, Name,Address,Contact) VALUES (1, 'Mr. Manish', " + " 'Sector-12,Noida', 2447658  );";
    cmd = new SqlCommand(sql,conn);// in this line above two errors occurred
    cmd.ExecuteNonQuery(); 

    sql = "INSERT INTO mySchoolRecord (StudentId, Name,Address,Contact) VALUES (2, 'Mr. Ravi', " + " 'New Delhi', 2584076521   );"; 
    cmd = new SqlCommand(sql,conn);// in this line above two errors occurred
    cmd.ExecuteNonQuery();

    sql = "INSERT INTO mySchoolRecord (StudentId, Name,Address,Contact) VALUES (3, 'Mr. Peter', " + " 'United States', 25684124  );"; 
    cmd = new SqlCommand(sql,conn);// in this line above two errors occurred
    cmd.ExecuteNonQuery(); 


    if (conn.State == ConnectionState.Open) 
    { 
        conn.Close(); 
    } 

} 
catch (OdbcException ex) 
{ 
   Console.WriteLine(ex); 
} 

    }
}

用SqlCommand替換OdbcCommand將解決您的問題