Esempio n. 1
0
        override internal void LoadForTable()
        {
            NpgsqlConnection cn = null;

            try
            {
                string query = "select * from information_schema.columns where table_catalog = '" +
                               this.Table.Database.Name + "' and table_schema = '" + this.Table.Schema +
                               "' and table_name = '" + this.Table.Name + "' order by ordinal_position";

                cn = ConnectionHelper.CreateConnection(this.dbRoot, this.Table.Database.Name);

                DataTable         metaData = new DataTable();
                NpgsqlDataAdapter adapter  = new NpgsqlDataAdapter(query, cn);

                adapter.Fill(metaData);

                metaData.Columns["udt_name"].ColumnName  = "TYPE_NAME";
                metaData.Columns["data_type"].ColumnName = "TYPE_NAMECOMPLETE";

                if (metaData.Columns.Contains("TYPE_NAME"))
                {
                    f_TypeName = metaData.Columns["TYPE_NAME"];
                }

                if (metaData.Columns.Contains("TYPE_NAMECOMPLETE"))
                {
                    f_TypeNameComplete = metaData.Columns["TYPE_NAMECOMPLETE"];
                }

                PopulateArray(metaData);

                // IsAutoKey logic
//				query = "SELECT a.attname AS column_name, c2.relname AS seq_name " +
//				"FROM pg_class c1, pg_class c2, pg_namespace n, pg_depend d, pg_attribute a " +
//				"WHERE n.nspname = '" + this.Table.Schema + "' AND c1.relname = '" + this.Table.Name + "' " +
//				"AND c2.relkind = 'S' AND c1.relnamespace = n.oid " +
//				"AND d.refobjid = c1.oid AND c2.oid = d.objid " +
//				"AND a.attrelid = c1.oid AND d.refobjsubid = a.attnum";

                query = @"SELECT a.attname AS column_name, substring(pg_get_expr(ad.adbin, c.oid) " +
                        @"FROM '[\'""]+(.+?)[\'""]+') AS seq_name " +
                        "FROM pg_class c, pg_namespace n, pg_attribute a, pg_attrdef ad " +
                        "WHERE n.nspname = '" + this.Table.Schema + "' AND c.relname = '" + this.Table.Name + "' " +
                        "AND c.relnamespace = n.oid " +
                        "AND a.attrelid = c.oid  AND a.atthasdef = true " +
                        "AND ad.adrelid = c.oid AND ad.adnum = a.attnum " +
                        @"AND pg_get_expr(ad.adbin, c.oid) LIKE 'nextval(%'";

                DataTable seqData = new DataTable();
                adapter = new NpgsqlDataAdapter(query, cn);
                adapter.Fill(seqData);

                DataRowCollection rows = seqData.Rows;

                if (rows.Count > 0)
                {
                    string colName;

                    for (int i = 0; i < rows.Count; i++)
                    {
                        colName = rows[i]["column_name"] as string;

                        PostgreSQL8Column col = this[colName] as PostgreSQL8Column;
                        col._isAutoKey = true;

                        query   = "SELECT min_value, increment_by FROM \"" + rows[i]["seq_name"] + "\"";
                        adapter = new NpgsqlDataAdapter(query, cn);
                        DataTable autokeyData = new DataTable();
                        adapter.Fill(autokeyData);

                        Int64 a;

                        a            = (Int64)autokeyData.Rows[0]["min_value"];
                        col._autoInc = Convert.ToInt32(a);

                        a             = (Int64)autokeyData.Rows[0]["increment_by"];
                        col._autoSeed = Convert.ToInt32(a);
                    }
                }

                cn.Close();
            }
            catch
            {
                if (cn != null)
                {
                    if (cn.State == ConnectionState.Open)
                    {
                        cn.Close();
                    }
                }
            }
        }