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110 lines
4.9 KiB
110 lines
4.9 KiB
#if MYSQL_6_10
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// Copyright © 2004, 2018, Oracle and/or its affiliates. All rights reserved.
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//
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// MySQL Connector/NET is licensed under the terms of the GPLv2
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// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
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// MySQL Connectors. There are special exceptions to the terms and
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// conditions of the GPLv2 as it is applied to this software, see the
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// FLOSS License Exception
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// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published
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// by the Free Software Foundation; version 2 of the License.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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using System;
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using System.Collections;
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using System.Data.Common;
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using Externals.MySql.Data.Types;
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using System.Data;
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namespace Externals.MySql.Data.MySqlClient
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{
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internal sealed partial class MySqlDataReader : DbDataReader, IDataReader, IDataRecord
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{
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/// <summary>
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/// Returns a DataTable that describes the column metadata of the MySqlDataReader.
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/// </summary>
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/// <returns></returns>
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public override DataTable GetSchemaTable()
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{
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// Only Results from SQL SELECT Queries
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// get a DataTable for schema of the result
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// otherwise, DataTable is null reference
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if (FieldCount == 0) return null;
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DataTable dataTableSchema = new DataTable("SchemaTable");
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dataTableSchema.Columns.Add("ColumnName", typeof(string));
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dataTableSchema.Columns.Add("ColumnOrdinal", typeof(int));
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dataTableSchema.Columns.Add("ColumnSize", typeof(int));
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dataTableSchema.Columns.Add("NumericPrecision", typeof(int));
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dataTableSchema.Columns.Add("NumericScale", typeof(int));
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dataTableSchema.Columns.Add("IsUnique", typeof(bool));
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dataTableSchema.Columns.Add("IsKey", typeof(bool));
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DataColumn dc = dataTableSchema.Columns["IsKey"];
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dc.AllowDBNull = true; // IsKey can have a DBNull
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dataTableSchema.Columns.Add("BaseCatalogName", typeof(string));
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dataTableSchema.Columns.Add("BaseColumnName", typeof(string));
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dataTableSchema.Columns.Add("BaseSchemaName", typeof(string));
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dataTableSchema.Columns.Add("BaseTableName", typeof(string));
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dataTableSchema.Columns.Add("DataType", typeof(Type));
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dataTableSchema.Columns.Add("AllowDBNull", typeof(bool));
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dataTableSchema.Columns.Add("ProviderType", typeof(int));
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dataTableSchema.Columns.Add("IsAliased", typeof(bool));
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dataTableSchema.Columns.Add("IsExpression", typeof(bool));
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dataTableSchema.Columns.Add("IsIdentity", typeof(bool));
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dataTableSchema.Columns.Add("IsAutoIncrement", typeof(bool));
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dataTableSchema.Columns.Add("IsRowVersion", typeof(bool));
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dataTableSchema.Columns.Add("IsHidden", typeof(bool));
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dataTableSchema.Columns.Add("IsLong", typeof(bool));
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dataTableSchema.Columns.Add("IsReadOnly", typeof(bool));
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int ord = 1;
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for (int i = 0; i < FieldCount; i++)
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{
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MySqlField f = ResultSet.Fields[i];
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DataRow r = dataTableSchema.NewRow();
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r["ColumnName"] = f.ColumnName;
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r["ColumnOrdinal"] = ord++;
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r["ColumnSize"] = f.IsTextField ? f.ColumnLength / f.MaxLength : f.ColumnLength;
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int prec = f.Precision;
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int pscale = f.Scale;
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if (prec != -1)
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r["NumericPrecision"] = (short)prec;
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if (pscale != -1)
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r["NumericScale"] = (short)pscale;
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r["DataType"] = GetFieldType(i);
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r["ProviderType"] = (int)f.Type;
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r["IsLong"] = f.IsBlob && (f.ColumnLength > 255 || f.ColumnLength == -1);
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r["AllowDBNull"] = f.AllowsNull;
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r["IsReadOnly"] = false;
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r["IsRowVersion"] = false;
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r["IsUnique"] = false;
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r["IsKey"] = f.IsPrimaryKey;
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r["IsAutoIncrement"] = f.IsAutoIncrement;
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r["BaseSchemaName"] = f.DatabaseName;
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r["BaseCatalogName"] = null;
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r["BaseTableName"] = f.RealTableName;
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r["BaseColumnName"] = f.OriginalColumnName;
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dataTableSchema.Rows.Add(r);
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}
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return dataTableSchema;
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}
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}
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}
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#endif
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