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 DbQueryProvider(IDataProvider provider)
{
_provider = provider;
IQueryLanguage lang = provider.QueryLanguage;
policy = new QueryPolicy(new ImplicitMapping(lang));
mapping = policy.Mapping;
language = mapping.Language;
}
public static Expression Build(QueryPolicy policy, Expression expression, Expression provider)
{
return(new ExecutionBuilder(policy, provider).Build(expression));
}
private ExecutionBuilder(QueryPolicy policy, Expression provider)
{
this.policy = policy;
this.provider = provider;
}
public static Expression Include(QueryPolicy policy, Expression expression)
{
return new RelationshipIncluder(policy).Visit(expression);
}
private RelationshipIncluder(QueryPolicy policy)
{
this.policy = policy;
this.mapping = policy.Mapping;
}