C＃ - 以編程方式創建SQL Server表

Question

我正嘗試以編程方式創建SQL Server表。這是代碼。

using (SqlConnection con = new SqlConnection(conStr)) 
{ 

    try 
    { 
     // 
     // Open the SqlConnection. 
     // 
     con.Open(); 
     // 
     // The following code uses an SqlCommand based on the SqlConnection. 
     // 
     using (SqlCommand command = new SqlCommand("CREATE TABLE Customer(First_Name char(50),Last_Name char(50),Address char(50),City char(50),Country char(25),Birth_Date datetime);", con)) 
      command.ExecuteNonQuery(); 

    } 
    catch (Exception ex) 
    { 
     MessageBox.Show(ex.Message); 
    } 
} 

當我跑步時我發現了一個例外，該應用程序第二次：

「已經有一個名爲‘客戶’數據庫中的對象」

但當我檢查數據庫時，我沒有看到這樣的表格。
這是我的連接字符串。

<connectionStrings> 
    <add name ="AutoRepairSqlProvider" connectionString= 
    "Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\AutoRepairDatabase.mdf; 
    Integrated Security=True;User Instance=True"/> 
</connectionStrings> 

當我運行時選擇查詢;我從現有的表中獲得結果，所以我認爲連接字符串應該可以。希望你會看到這個問題：/

Answer 1

您沒有提到Initial catalog連接字符串中的名稱。將數據庫名稱命名爲Initial Catalog名稱。

<add name ="AutoRepairSqlProvider" connectionString= 
    "Data Source=.\SQLEXPRESS; Initial Catalog=MyDatabase; AttachDbFilename=|DataDirectory|\AutoRepairDatabase.mdf; 
    Integrated Security=True;User Instance=True"/> 

Answer 2

試試這個

檢查是否有表那裏，刪除表，然後創建

using (SqlCommand command = new SqlCommand("IF EXISTS (
SELECT * 
FROM sys.tables 
WHERE name LIKE '#Customer%') 
DROP TABLE #Customer CREATE TABLE Customer(First_Name char(50),Last_Name char(50),Address char(50),City char(50),Country char(25),Birth_Date datetime);", con)) 

Answer 3

在SQL Server管理數據庫對象，我建議表是否存在使用Server Management Objects

Answer 4

首先檢查。如果不存在，則創建表。

var commandStr= "If not exists (select name from sysobjects where name = 'Customer') CREATE TABLE Customer(First_Name char(50),Last_Name char(50),Address char(50),City char(50),Country char(25),Birth_Date datetime)"; 

using (SqlCommand command = new SqlCommand(commandStr, con)) 
command.ExecuteNonQuery(); 

Answer 5

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

namespace SqlCommend 
{ 
    class sqlcreateapp 
    { 
     static void Main(string[] args) 
     { 
      try 
      { 
       SqlConnection conn = new SqlConnection("Data source=USER-PC; Database=Emp123;User Id=sa;Password=sa123"); 
       SqlCommand cmd = new SqlCommand("create table <Table Name>(empno int,empname varchar(50),salary money);", conn); 
       conn.Open(); 
       cmd.ExecuteNonQuery(); 
       Console.WriteLine("Table Created Successfully..."); 
       conn.Close(); 
      } 
      catch(Exception e) 
      { 
       Console.WriteLine("exception occured while creating table:" + e.Message + "\t" + e.GetType()); 
      } 
      Console.ReadKey(); 
     } 
    } 
} 

Answer 6

如果你不喜歡回憶的SQL語法，使用Mig#您可以簡單：

var schema = new DbSchema(ConnectionString, DbPlatform.SqlServer2014); 
schema.Alter(db => db.CreateTable("Customer") 
    .WithPrimaryKeyColumn("Id", DbType.Int32).AsIdentity() 
    .WithNotNullableColumn("First_Name", DbType.String).OfSize(50) 
    .WithNotNullableColumn("Last_Name", DbType.String).OfSize(50) 
    ...); 

如果你不知道，如果它已經存在，請撥打DropIfExists前：

db.Tables["Customers"].DropIfExists(); 

Answer 7

試試這個：

protected void Button1_Click(object sender, EventArgs e) 
{ 
    SqlConnection cn = new SqlConnection("Data Source=(LocalDB)\\v11.0;AttachDbFilename=|DataDirectory|\\Database.mdf;Integrated Security=True"); 
    try 
    { 
     cn.Open(); 
     SqlCommand cmd = new SqlCommand("create table Employee (empno int,empname varchar(50),salary money);", cn); 
     cmd.ExecuteNonQuery(); 
     lblAlert.Text = "SucessFully Connected"; 
     cn.Close(); 
    } 
    catch (Exception eq) 
    { 
     lblAlert.Text = eq.ToString(); 
    } 
}