public ICollection <Type> Select <Type> (DbQuery query, Func <DbRow, Type> construct_from_container)
{
var sql_query = new DbQueryToSql(this, query);
Collection <Type> results = new Collection <Type>();
using (SqlDataReader reader = SqlQuery.Select(connection_string, sql_query.Query, CommandType.Text, CommandBehavior.CloseConnection, sql_query.Parameters))
{
if (reader.HasRows)
{
while (reader.Read())
{
DbRow c = new DbRow(this);
c.LoadValuesWithoutRead(reader);
Type t = construct_from_container(c);
results.Add(t);
}
}
}
return(results);
}
public void Select(DbQuery query)
{
var sql_query = new DbQueryToSql(this, query);
using (SqlDataReader reader = SqlQuery.Select(connection_string, sql_query.Query, CommandType.Text, CommandBehavior.SingleResult | CommandBehavior.CloseConnection, sql_query.Parameters))
{
LoadValues(reader);
}
}
public int SelectCount(DbQuery query)
{
string select_columns = query.Columns;
string from = query.From;
string where = query.Where;
string join = null;
if (string.IsNullOrEmpty(select_columns))
{
select_columns = GetSelectColumns();
}
if (string.IsNullOrEmpty(from))
{
from = table_name;
}
if (!string.IsNullOrEmpty(where))
{
where = string.Format("WHERE {0}", where);
}
List <SqlQueryParameter> sql_parameters = null;
if (query.Parameters != null)
{
sql_parameters = new List <SqlQueryParameter>(query.Parameters);
}
if (query.Join != null)
{
var join_clause = query.Join;
var join_query = new DbQueryToSql(this, join_clause.Query);
join = string.Format("{0} JOIN {1} ON {2}", join_clause.Type, join_query.Query, join_clause.Condition);
if (join_query.Parameters != null)
{
if (sql_parameters == null)
{
sql_parameters = new List <SqlQueryParameter>();
}
sql_parameters.AddRange(join_query.Parameters);
}
}
string select_statement;
select_statement = string.Format("SELECT COUNT ({0}) FROM {1} {2} {3}",
select_columns,
from,
join,
where);
return(Convert.ToInt32(SqlQuery.execute_sql_scalar(connection_string, select_statement, CommandType.Text, sql_parameters != null ? sql_parameters.ToArray() : null)));
}
private static string BuildSqlJoin(DbRow container, DbQuery.DbJoin join, List <SqlQueryParameter> sql_parameters)
{
if (join != null)
{
StringBuilder sb_join = new StringBuilder();
if (!string.IsNullOrEmpty(join.Container))
{
sb_join.AppendFormat("{0} JOIN {1} ON {2}", join.Type, join.Container, join.Condition);
}
else
{
var parsed_join = new DbQueryToSql(container, join.Query);
sb_join.AppendFormat("{0} JOIN {1} ON {2}", join.Type, parsed_join.Query, join.Condition);
if (parsed_join.Parameters != null)
{
if (sql_parameters == null)
{
sql_parameters = new List <SqlQueryParameter>();
}
sql_parameters.AddRange(parsed_join.Parameters);
}
}
if (join.ChainedJoin != null)
{
sb_join.Append(' ').Append(BuildSqlJoin(container, join.ChainedJoin, sql_parameters));
}
return(sb_join.ToString());
}
else
{
return(null);
}
}
public Type SelectSingle <Type>(DbQuery query, Func <DbRow, Type> construct_from_container) where Type : class
{
var sql_query = new DbQueryToSql(this, query);
Type t = null;
using (SqlDataReader reader = SqlQuery.Select(connection_string, sql_query.Query, CommandType.Text, CommandBehavior.CloseConnection, sql_query.Parameters))
{
if (reader.HasRows)
{
if (reader.Read())
{
DbRow c = new DbRow(this);
c.LoadValuesWithoutRead(reader);
t = construct_from_container(c);
}
}
}
return(t);
}
