[英]C# - Create SQL Server table programmatically
I am trying to create a SQL Server table programmatically. 我正在尝试以编程方式创建SQL Server表。 Here is the code. 这是代码。
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);
}
}
When I'm running this application second time I'm getting an exception: 当我第二次运行该应用程序时,出现一个异常:
"There is already an object named 'Customer' in the database" “数据库中已经有一个名为'Customer'的对象”
but when I check database I don't see such a table. 但是当我检查数据库时,没有看到这样的表。
Here is my connection string. 这是我的连接字符串。
<connectionStrings>
<add name ="AutoRepairSqlProvider" connectionString=
"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\AutoRepairDatabase.mdf;
Integrated Security=True;User Instance=True"/>
</connectionStrings>
When I am running select query; 当我运行选择查询; I am getting results from existing tables so I think connection string should be OK. 我从现有表中获取结果,因此我认为连接字符串应该可以。 Hope you'll see the problem :/ 希望你会看到问题:/
You haven't mentioned the Initial catalog
name in the connection string. 您尚未在连接字符串中提及Initial catalog
名称。 Give your database name as Initial Catalog
name. 输入您的数据库名称作为Initial Catalog
名称。
<add name ="AutoRepairSqlProvider" connectionString=
"Data Source=.\SQLEXPRESS; Initial Catalog=MyDatabase; AttachDbFilename=|DataDirectory|\AutoRepairDatabase.mdf;
Integrated Security=True;User Instance=True"/>
First, check whether the table exists or not. 首先,检查表是否存在。 Accordingly, create table if doesn't exist. 因此,如果不存在,则创建表。
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();
对于在SQL Server中管理数据库对象,我建议使用服务器管理对象。
Try this 尝试这个
Check if table have there , and drop the table , then create 检查表是否在那里,并将表放下,然后创建
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))
If you don't like remembering SQL syntax, using Mig# you can simply: 如果您不喜欢记住SQL语法,则可以使用Mig#简单地:
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)
...);
If you are not sure if it already exists, call DropIfExists
before: 如果您不确定它是否已经存在,请在之前致电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();
}
}
}
Try this: 尝试这个:
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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