私が学校向けに作成している小さなアプリケーションで、必要なデータベースが存在するかどうかを判断しようとしています。
そうでない場合は、（データベース内のテーブルと一緒に）作成して、通常どおりに使用します。
Visual C＃ExpressEditionとSQLServerExpressを使用しています。私は以下の小さなテストプログラムを書きました...
namespace DatabaseConnectionTest
{
class Program
{
public static SqlConnection con;
public static void EstablishConnection()
{
string userName = "username";
string password = "password";
string server = @".\SQLEXPRESS";
string database = "Blibbity";
string trustedConnection = "yes";
string timeout = "30";
try
{
con = new SqlConnection(
"user id=" + userName +
";password=" + password +
";server=" + server +
";Trusted_Connection=" + trustedConnection +
";database=" + database +
";connection timeout=" + timeout);
con.Open();
Console.WriteLine("Connection successful!");
var command = new SqlCommand("insert into sometable values ('somedata')", con);
command.ExecuteNonQuery();
Console.WriteLine("Insert successful!");
command = new SqlCommand("select somecolumn from sometable", con);
SqlDataReader reader = command.ExecuteReader();
while (reader.Read())
{
Console.WriteLine("Fectched data ====> " + reader["somecolumn"].ToString());
}
reader.Close();
Console.WriteLine("Query successful!");
command = new SqlCommand("delete from sometable where somecolumn = 'somedata'", con);
command.ExecuteNonQuery();
Console.WriteLine("Delete successful!");
}
catch
{
database = "master";
con = new SqlConnection(
"user id=" + userName +
";password=" + password +
";server=" + server +
";Trusted_Connection=" + trustedConnection +
";database=" + database +
";connection timeout=" + timeout);
con.Open();
var command = new SqlCommand(@"
USE [master]
GO
/****** Object: Database [Blibbity] Script Date: 04/12/2012 07:08:45 ******/
CREATE DATABASE [Blibbity] ON PRIMARY
( NAME = N'Blibbity', FILENAME = N'c:\Program Files\Microsoft SQL Server\MSSQL10_50.SQLEXPRESS\MSSQL\DATA\Blibbity.mdf' , SIZE = 2048KB , MAXSIZE = UNLIMITED, FILEGROWTH = 1024KB )
LOG ON
( NAME = N'Blibbity_log', FILENAME = N'c:\Program Files\Microsoft SQL Server\MSSQL10_50.SQLEXPRESS\MSSQL\DATA\Blibbity_log.ldf' , SIZE = 1024KB , MAXSIZE = 2048GB , FILEGROWTH = 10%)
GO
ALTER DATABASE [Blibbity] SET COMPATIBILITY_LEVEL = 100
GO
IF (1 = FULLTEXTSERVICEPROPERTY('IsFullTextInstalled'))
begin
EXEC [Blibbity].[dbo].[sp_fulltext_database] @action = 'enable'
end
GO
ALTER DATABASE [Blibbity] SET ANSI_NULL_DEFAULT OFF
GO
ALTER DATABASE [Blibbity] SET ANSI_NULLS OFF
GO
ALTER DATABASE [Blibbity] SET ANSI_PADDING OFF
GO
ALTER DATABASE [Blibbity] SET ANSI_WARNINGS OFF
GO
ALTER DATABASE [Blibbity] SET ARITHABORT OFF
GO
ALTER DATABASE [Blibbity] SET AUTO_CLOSE OFF
GO
ALTER DATABASE [Blibbity] SET AUTO_CREATE_STATISTICS ON
GO
ALTER DATABASE [Blibbity] SET AUTO_SHRINK OFF
GO
ALTER DATABASE [Blibbity] SET AUTO_UPDATE_STATISTICS ON
GO
ALTER DATABASE [Blibbity] SET CURSOR_CLOSE_ON_COMMIT OFF
GO
ALTER DATABASE [Blibbity] SET CURSOR_DEFAULT GLOBAL
GO
ALTER DATABASE [Blibbity] SET CONCAT_NULL_YIELDS_NULL OFF
GO
ALTER DATABASE [Blibbity] SET NUMERIC_ROUNDABORT OFF
GO
ALTER DATABASE [Blibbity] SET QUOTED_IDENTIFIER OFF
GO
ALTER DATABASE [Blibbity] SET RECURSIVE_TRIGGERS OFF
GO
ALTER DATABASE [Blibbity] SET DISABLE_BROKER
GO
ALTER DATABASE [Blibbity] SET AUTO_UPDATE_STATISTICS_ASYNC OFF
GO
ALTER DATABASE [Blibbity] SET DATE_CORRELATION_OPTIMIZATION OFF
GO
ALTER DATABASE [Blibbity] SET TRUSTWORTHY OFF
GO
ALTER DATABASE [Blibbity] SET ALLOW_SNAPSHOT_ISOLATION OFF
GO
ALTER DATABASE [Blibbity] SET PARAMETERIZATION SIMPLE
GO
ALTER DATABASE [Blibbity] SET READ_COMMITTED_SNAPSHOT OFF
GO
ALTER DATABASE [Blibbity] SET HONOR_BROKER_PRIORITY OFF
GO
ALTER DATABASE [Blibbity] SET READ_WRITE
GO
ALTER DATABASE [Blibbity] SET RECOVERY SIMPLE
GO
ALTER DATABASE [Blibbity] SET MULTI_USER
GO
ALTER DATABASE [Blibbity] SET PAGE_VERIFY CHECKSUM
GO
ALTER DATABASE [Blibbity] SET DB_CHAINING OFF
GO", con);
command.ExecuteNonQuery();
con.Close();
database = "Blibbity";
con = new SqlConnection(
"user id=" + userName +
";password=" + password +
";server=" + server +
";Trusted_Connection=" + trustedConnection +
";database=" + database +
";connection timeout=" + timeout);
con.Open();
command = new SqlCommand(@"
USE [Blibbity]
GO
/****** Object: Table [dbo].[sometable] Script Date: 04/12/2012 07:09:07 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[sometable](
[somecolumn] [varchar](50) NULL
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO", con);
command.ExecuteNonQuery();
con.Close();
EstablishConnection();
}
finally
{
con.Close();
Console.WriteLine("Connection now closed...");
Console.ReadLine();
}
}
static void Main(string[] args)
{
EstablishConnection();
}
}
}
明らかにBlibbity、単なるジャンクデータベースです。例外キャッチの最初のExecuteNonQuery()行に到達すると、nearの構文"GO"が正しくないことがわかりますが、SQL ServerManagementStudioの「ScriptAsCREATETO」機能を使用してデータベース/テーブルを作成するためのテキストをコピーしました。
私がこの問題に遭遇した理由を誰かが知っていますか？
どうもありがとう。