public DbQueryProvider(IDataProvider provider)
{
_provider = provider;
QueryLanguage lang;
switch (_provider.Client)
{
case DataClient.MySqlClient:
lang = new MySqlLanguage(_provider);
break;
case DataClient.SQLite:
lang = new SqliteLanguage(_provider);
break;
default:
lang = new TSqlLanguage(_provider);
break;
}
//connection = _provider.CreateConnection();
policy = new QueryPolicy(new ImplicitMapping(lang));
mapping = policy.Mapping;
language = mapping.Language;
}
/// <summary>
/// DbQueryProvider constrcutor that allows for external control of policy
/// to allow for new types of databases.
/// </summary>
public DbQueryProvider(IDataProvider provider, QueryPolicy paramPolicy, TextWriter log)
{
_provider = provider;
connection = _provider.CreateConnection();
policy = paramPolicy;
mapping = policy.Mapping;
language = mapping.Language;
//log = log;
}
public static Expression Rewrite(QueryLanguage language, Expression expression)
{
return new SingletonProjectionRewriter(language).Visit(expression);
}
private SingletonProjectionRewriter(QueryLanguage language)
{
this.language = language;
}
public ImplicitMapping(QueryLanguage language)
: base(language)
{
}
protected QueryMapping(QueryLanguage language)
{
this.language = language;
}
protected QueryMapping(QueryLanguage language)
{
this.language = language;
}
public static Expression Rewrite(QueryLanguage language, Expression expression)
{
return new ClientJoinedProjectionRewriter(language).Visit(expression);
}
private ClientJoinedProjectionRewriter(QueryLanguage language)
{
this.language = language;
}
public ImplicitMapping(QueryLanguage language)
: base(language)
{
}