C# - 以编程方式创建SQL Server表

Question

我试图以编程方式创建SQL Server表.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);
    }
}

当我第二次运行这个应用程序时,我得到一个例外:

"数据库中已有一个名为'Customer'的对象"

但是当我检查数据库时,我没有看到这样的表格.
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>

当我运行select查询时; 我从现有表中获得结果,所以我认为连接字符串应该没问题.希望你能看到问题:/

Answer 1

您尚未Initial catalog在连接字符串中提及该名称.将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"/>

Answer 2

首先检查表是否存在.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();