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我们得到了一些使用 SQL Server 数据库的单元测试。为了至少使每个测试夹具独特且独立于其他测试夹具,我尝试在每个测试夹具开始之前恢复数据库。每个测试都在其例程中打开和关闭连接和数据库。

在第一个测试夹具之前恢复数据库效果很好,但在第二个测试夹具之前恢复数据库(在打开和关闭连接和数据库之后)就不行了。

我封装并隔离了问题。这是两个示例测试(NewUnitTest1 将首先执行):

using NUnit.Framework;
using System.Data;
using System.Data.SqlClient;

    [TestFixture]
    class UnitTest1 : BaseTest
    {
        [Test]
        public void NewUnitTest1()
        {
            string conString = ConnectionStringHelper.GetConnectionString(SCADADatabases.ConfigurationDatabase); // Helper method to optain connection string, is correct
            using (SqlConnection dbConn = new SqlConnection(conString))
            {
                SqlCommand cmd = dbConn.CreateCommand();
                cmd.CommandText = "SELECT * FROM TB_PV";
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                DataSet ds = new DataSet();
                da.Fill(ds);
            } // Dispose should close connection and database ...
            Assert.IsTrue(true);
        }
    }

    [TestFixture]
    class UnitTest2 : BaseTest
    {
        [Test]
        public void NewUnitTest2()
        {
            Assert.IsTrue(true);
        }
    }

基本测试类将在每个测试夹具之前完成恢复工作:

using My.Core.Helper;
using My.Core.UnitTest.Properties;
using My.DBRestore.Core;
using My.Domain;
using Microsoft.SqlServer.Management.Smo;
using NUnit.Framework;
using System;
using System.Data;
using System.IO;

    /// <summary>
    /// Base test class any test class can inherit from. 
    /// </summary>
    public abstract partial class BaseTest
    {
        /// <summary>
        /// Executes before all tests of this class start. 
        /// </summary>
        [TestFixtureSetUp]
        public virtual void FixtureSetUp()
        {
            Console.WriteLine("Recover database ... ");
            restoreDatabase("MYDATABASE", @"D:\MYBACKUP.BAK", "");
            Console.WriteLine("Run tests in " + this.GetType() + " ...");
        }

        private void restoreDatabase(string destinationDatabase, string backupFile, string dbPath)
        {
            Microsoft.SqlServer.Management.Smo.Server sqlServer = new Microsoft.SqlServer.Management.Smo.Server(Properties.Settings.Default.SQLInstance);

            Microsoft.SqlServer.Management.Smo.Restore restore = new Microsoft.SqlServer.Management.Smo.Restore();
            restore.Action = Microsoft.SqlServer.Management.Smo.RestoreActionType.Database;
            restore.Devices.Add(new Microsoft.SqlServer.Management.Smo.BackupDeviceItem(backupFile, Microsoft.SqlServer.Management.Smo.DeviceType.File));

            System.Data.DataTable dt = restore.ReadBackupHeader(sqlServer);
            restore.FileNumber = Convert.ToInt32(dt.Rows[dt.Rows.Count - 1]["Position"]);

            dt = restore.ReadFileList(sqlServer);
            int indexMdf = dt.Rows.Count - 2;
            int indexLdf = dt.Rows.Count - 1;
            Microsoft.SqlServer.Management.Smo.RelocateFile dataFile = new Microsoft.SqlServer.Management.Smo.RelocateFile();
            string mdf = dt.Rows[indexMdf][1].ToString();
            dataFile.LogicalFileName = dt.Rows[indexMdf][0].ToString();
            dataFile.PhysicalFileName = Path.Combine(dbPath, destinationDatabase + Path.GetExtension(mdf));


            Microsoft.SqlServer.Management.Smo.RelocateFile logFile = new Microsoft.SqlServer.Management.Smo.RelocateFile();
            string ldf = dt.Rows[indexLdf][1].ToString();
            logFile.LogicalFileName = dt.Rows[indexLdf][0].ToString();
            logFile.PhysicalFileName = Path.Combine(dbPath, destinationDatabase + Path.GetExtension(ldf));

            restore.RelocateFiles.Add(dataFile);
            restore.RelocateFiles.Add(logFile);

            restore.Database = destinationDatabase;
            restore.ReplaceDatabase = true;
            restore.SqlRestore(sqlServer); // <- this is where the FailedOperationException is thrown on the second execution
        }
}

如前所述,第一次恢复效果很好。第二次 FailedOperationException 声明:无法独占访问数据库,因为数据库当前正在使用中。RESTORE DATABASE 将因错误而停止。(由我手动翻译)

我们正在使用最新的 NUnit 2 版本(2.6.4)。为什么数据库仍在使用中,如何正确关闭它?

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1 回答 1

2

您需要在还原之前杀死所有连接到数据库的进程:

sqlServer.KillAllProcesses(destinationDatabase)

查看文档以获取更多详细信息。

于 2016-01-05T17:34:56.847 回答