Connecting to the database, I learn SQL a little experience, continue to improve

SQL连接器
.........\SqlConnectionApp
.........\................\SqlConnectionApp
.........\................\SqlConnectionApp.sln
.........\................\SqlConnectionApp.suo
.........\................\................\bin
.........\................\................\...\Debug
.........\................\................\...\.....\SqlConnectionApp.application
.........\................\................\...\.....\SqlConnectionApp.exe
.........\................\................\...\.....\SqlConnectionApp.exe.manifest
.........\................\................\...\.....\SqlConnectionApp.pdb
.........\................\................\...\.....\SqlConnectionApp.vshost.application
.........\................\................\...\.....\SqlConnectionApp.vshost.exe
.........\................\................\DBHelper.cs
.........\................\................\findStr.cs
.........\................\................\findStr.Designer.cs
.........\................\................\findStr.resx
.........\................\................\Form1.cs
.........\................\................\Form1.Designer.cs
.........\................\................\Form1.resx
.........\................\................\obj
.........\................\................\...\Debug
.........\................\................\...\.....\Refactor
.........\................\................\...\.....\SqlConnectionApp.application
.........\................\................\...\.....\SqlConnectionApp.csproj.FileListAbsolute.txt
.........\................\................\...\.....\SqlConnectionApp.csproj.GenerateResource.Cache
.........\................\................\...\.....\SqlConnectionApp.exe
.........\................\................\...\.....\SqlConnectionApp.exe.manifest
.........\................\................\...\.....\SqlConnectionApp.findStr.resources
.........\................\................\...\.....\SqlConnectionApp.Form1.resources
.........\................\................\...\.....\SqlConnectionApp.pdb
.........\................\................\...\.....\SqlConnectionApp.Properties.Resources.resources
.........\................\................\...\.....\TempPE
.........\................\................\Program.cs
.........\................\................\Properties
.........\................\................\..........\AssemblyInfo.cs
.........\................\................\..........\Resources.Designer.cs
.........\................\................\..........\Resources.resx
.........\................\................\..........\Settings.Designer.cs
.........\................\................\..........\Settings.settings
.........\................\................\publish
.........\................\................\.......\Application Files
.........\................\................\.......\.................\SqlConnectionApp_1_0_0_0
.........\................\................\.......\.................\........................\SqlConnectionApp.application
.........\................\................\.......\.................\........................\SqlConnectionApp.exe.deploy
.........\................\................\.......\.................\........................\SqlConnectionApp.exe.manifest
.........\................\................\.......\setup.exe
.........\................\................\.......\SqlConnectionApp.application
.........\................\................\SqlConnectionApp.csproj
.........\................\................\SqlConnectionApp.csproj.user
.........\................\................\SqlConnectionApp_TemporaryKey.pfx

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