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Entity Framework 6连接Postgresql、SQLite、LocalDB的注意事项和配置文件

2024-07-20 21:17:35   212人阅读

Postgresql
Postgresql支持Code First的方式自动生成表，不过默认的模式是dbo而不是public，而且还可以自动生成自增主键。
<?xml version="1.0" encoding="utf-8"?> <configuration> <configSections> <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 --> <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" /> </configSections> <entityFramework> <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework"> <parameters> <parameter value="v11.0" /> </parameters> </defaultConnectionFactory> <providers> <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" /> <provider invariantName="Npgsql" type="Npgsql.NpgsqlServices, Npgsql.EntityFramework" /> </providers> </entityFramework> <system.data> <DbProviderFactories> <remove invariant="Npgsql"></remove> <add name="Npgsql Data Provider" invariant="Npgsql" description=".Net Framework Data Provider for Postgresql Server" type="Npgsql.NpgsqlFactory, Npgsql" /> </DbProviderFactories> </system.data> <connectionStrings> <add name ="BrKxxContext" connectionString ="server=127.0.0.1;User Id=postgres;password=energy;database=eftest" providerName="Npgsql"/> </connectionStrings> </configuration>
 
SQLite
SQLite不支持Code First的方式自动生成表，所以可能会报找不到相应的table的错误，没办法只能自己手动建表了，另外，SQLite虽然支持INTEGER类型的自增主键，但是INTEGER在C#中对应的是long或者Int64的类型，这个是要注意的，给Model设置主键时一定要设对类型，不然会出问题。
<?xml version="1.0" encoding="utf-8"?> <configuration> <configSections> <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 --> <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" /> </configSections> <connectionStrings> <add name="BrKxxContext" providerName="System.Data.SQLite.EF6" connectionString="Data Source=|DataDirectory|BrKxx.db;Pooling=True" /> </connectionStrings> <system.data> <DbProviderFactories> <remove invariant="System.Data.SQLite" /> <add name="SQLite Data Provider" invariant="System.Data.SQLite" description=".Net Framework Data Provider for SQLite" type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite" /> <remove invariant="System.Data.SQLite.EF6" /> <add name="SQLite Data Provider (Entity Framework 6)" invariant="System.Data.SQLite.EF6" description=".Net Framework Data Provider for SQLite (Entity Framework 6)" type="System.Data.SQLite.EF6.SQLiteProviderFactory, System.Data.SQLite.EF6" /> </DbProviderFactories> </system.data> <entityFramework> <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework"> <parameters> <parameter value="v11.0" /> </parameters> </defaultConnectionFactory> <providers> <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" /> <!--<provider invariantName="System.Data.SQLite.EF6" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6" />--> <provider invariantName="System.Data.SQLite" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6" /> </providers> </entityFramework> </configuration>
 
LocalDB
1、如果是单独只安装LocalDB的情况下，LocalDB不会自动开启默认的进程，需要通过提供的SqlLocalDB.exe来创建或者开启相应的进程
2、如果部署的机器上只安装了.NET 4.0的运行环境，那么你的应用程序将无法访问LocalDB，你需要安装.NET 4.0.2以上的版本才能正常的访问LocalDB
<?xml version="1.0" encoding="utf-8"?> <configuration> <configSections> <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 --> <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false"/> </configSections> <entityFramework> <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework"> <parameters> <parameter value="v11.0"/> </parameters> </defaultConnectionFactory> <providers> <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer"/> </providers> </entityFramework> <connectionStrings> <add name="BrKxxContext" providerName="System.Data.SqlClient" connectionString="Data Source=(LocalDb)\v11.0;Initial Catalog=BrKxx;AttachDbFilename=|DataDirectory|BrKxx.mdf;Integrated Security=True;"/> </connectionStrings> </configuration>
 
最后
DataDirectory一般是指App_Data，如果使用默认值得情况下，提示找不到数据库文件，或者你想把数据库文件放在指定的路径下，就需要在程序启动的地方人为的设置DataDirectory
AppDomain.CurrentDomain.SetData("DataDirectory", Application.StartupPath + "\\App_Data\\");

Entity Framework 6连接Postgresql、SQLite、LocalDB的注意事项和配置文件


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