[英]C# - Create SQL Server table programmatically
我正在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);
}
}
當我第二次運行該應用程序時,出現一個異常:
“數據庫中已經有一個名為'Customer'的對象”
但是當我檢查數據庫時,沒有看到這樣的表。
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>
當我運行選擇查詢; 我從現有表中獲取結果,因此我認為連接字符串應該可以。 希望你會看到問題:/
您尚未在連接字符串中提及Initial catalog
名稱。 輸入您的數據庫名稱作為Initial Catalog
名稱。
<add name ="AutoRepairSqlProvider" connectionString=
"Data Source=.\SQLEXPRESS; Initial Catalog=MyDatabase; AttachDbFilename=|DataDirectory|\AutoRepairDatabase.mdf;
Integrated Security=True;User Instance=True"/>
首先,檢查表是否存在。 因此,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();
對於在SQL Server中管理數據庫對象,我建議使用服務器管理對象。
嘗試這個
檢查表是否在那里,並將表放下,然后創建
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))
如果您不喜歡記住SQL語法,則可以使用Mig#簡單地:
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)
...);
如果您不確定它是否已經存在,請在之前致電DropIfExists
:
db.Tables["Customers"].DropIfExists();
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();
}
}
}
嘗試這個:
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();
}
}
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