???? Entity Framework ?? ??

EF(Entity Framework) ? API ??????? ?????? ??? ???? ???? ?? ???? ?? ?????. ? ????? ?? ??? ?? ??? ???? ?? ??? ????.

?? ?? ??:

?? ??? ?? ??? ???? ??? ??? ? ????.

<code>public void Connect(Database database)
{
    //構(gòu)建 SQL 連接字符串
    SqlConnectionStringBuilder sqlString = new SqlConnectionStringBuilder()
    {
        DataSource = database.Server,
        InitialCatalog = database.Catalog,
        UserID = database.Username,
        Password = database.Password,
    };

    //構(gòu)建實體框架連接字符串
    EntityConnectionStringBuilder entityString = new EntityConnectionStringBuilder()
    {
        Provider = database.Provider,
        Metadata = Settings.Default.Metadata,
        ProviderConnectionString = sqlString.ToString()
    };

    //將新的連接字符串分配給數(shù)據(jù)上下文
    // ...
}</code>

?? ???:

? API ??????? ????? ??? ??? ?? ???? ??? ????? ????? ???. ??? ?? ????? ???? ?? ?? ???? ???? ??? ??? ???? ???.

EF ?? ??:

??? ??? ??? ?? ???? ?????? ?? ??? ???? EF? ?? ??? ?????. ??? ? ??? ???? ???? ???? ?? ??? ????. ?? ?? ?? ?? ???? ???? ?? ???? ??? ?? ?? ???? ???? ??? ? ????.

<code>public static class ConnectionTools
{
    public static void ChangeDatabase(
        this DbContext source,
        string initialCatalog = "",
        string dataSource = "",
        string userId = "",
        string password = "",
        bool integratedSecuity = true,
        string configConnectionStringName = "")
    {
        var sqlCnxStringBuilder = new SqlConnectionStringBuilder
        (System.Configuration.ConfigurationManager
            .ConnectionStrings[configConnectionStringName].ConnectionString);

        // ... [設(shè)置連接屬性] ...

        //將新的連接字符串分配給數(shù)據(jù)上下文
        source.Database.Connection.ConnectionString
            = sqlCnxStringBuilder.ConnectionString;
    }
}</code>

? ??? ???? ?? ??? ?? ???? ???? ??? ?????? ???? ?? ??? ?? ?? ?? ??? ??? ? ????.

??? ??? ???? EF ? API ???????? ?????? ??? ????? ??? ? ???? ??? ??? ??? ???? ??? ?? ??? ??? ? ?? ?? ???? ???? ?????.

? ??? ???? Entity Framework ?????? ??? ???? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!