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417 lines
14 KiB
417 lines
14 KiB
// Copyright (c) 2004-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
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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 version 2 as published by
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// the Free Software Foundation
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//
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// There are special exceptions to the terms and conditions of the GPL
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// as it is applied to this software. View the full text of the
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// exception in file EXCEPTIONS in the directory of this software
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// distribution.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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using System.Text;
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using MySql.Data.Common;
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using MySql.Data.Types;
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using System.Globalization;
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using System.Text.RegularExpressions;
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using System;
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using System.Collections;
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using System.Collections.Generic;
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namespace MySql.Data.MySqlClient
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{
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internal enum ColumnFlags : int
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{
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NOT_NULL = 1,
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PRIMARY_KEY = 2,
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UNIQUE_KEY = 4,
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MULTIPLE_KEY = 8,
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BLOB = 16,
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UNSIGNED = 32,
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ZERO_FILL = 64,
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BINARY = 128,
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ENUM = 256,
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AUTO_INCREMENT = 512,
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TIMESTAMP = 1024,
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SET = 2048,
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NUMBER = 32768
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} ;
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/// <summary>
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/// Summary description for Field.
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/// </summary>
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internal class MySqlField
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{
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#region Fields
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// public fields
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public string CatalogName;
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public int ColumnLength;
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public string ColumnName;
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public string OriginalColumnName;
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public string TableName;
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public string RealTableName;
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public string DatabaseName;
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public Encoding Encoding;
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public int maxLength;
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// protected fields
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protected ColumnFlags colFlags;
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protected int charSetIndex;
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protected byte precision;
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protected byte scale;
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protected MySqlDbType mySqlDbType;
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protected DBVersion connVersion;
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protected Driver driver;
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protected bool binaryOk;
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protected List<Type> typeConversions = new List<Type>();
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#endregion
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public MySqlField(Driver driver)
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{
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this.driver = driver;
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connVersion = driver.Version;
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maxLength = 1;
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binaryOk = true;
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}
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#region Properties
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public int CharacterSetIndex
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{
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get { return charSetIndex; }
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set { charSetIndex = value; SetFieldEncoding(); }
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}
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public MySqlDbType Type
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{
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get { return mySqlDbType; }
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}
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public byte Precision
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{
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get { return precision; }
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set { precision = value; }
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}
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public byte Scale
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{
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get { return scale; }
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set { scale = value; }
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}
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public int MaxLength
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{
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get { return maxLength; }
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set { maxLength = value; }
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}
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public ColumnFlags Flags
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{
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get { return colFlags; }
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}
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public bool IsAutoIncrement
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{
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get { return (colFlags & ColumnFlags.AUTO_INCREMENT) > 0; }
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}
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public bool IsNumeric
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{
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get { return (colFlags & ColumnFlags.NUMBER) > 0; }
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}
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public bool AllowsNull
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{
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get { return (colFlags & ColumnFlags.NOT_NULL) == 0; }
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}
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public bool IsUnique
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{
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get { return (colFlags & ColumnFlags.UNIQUE_KEY) > 0; }
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}
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public bool IsPrimaryKey
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{
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get { return (colFlags & ColumnFlags.PRIMARY_KEY) > 0; }
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}
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public bool IsBlob
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{
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get
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{
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return (mySqlDbType >= MySqlDbType.TinyBlob &&
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mySqlDbType <= MySqlDbType.Blob) ||
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(mySqlDbType >= MySqlDbType.TinyText &&
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mySqlDbType <= MySqlDbType.Text) ||
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(colFlags & ColumnFlags.BLOB) > 0;
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}
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}
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public bool IsBinary
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{
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get
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{
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return binaryOk && (CharacterSetIndex == 63);
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}
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}
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public bool IsUnsigned
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{
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get { return (colFlags & ColumnFlags.UNSIGNED) > 0; }
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}
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public bool IsTextField
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{
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get
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{
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return Type == MySqlDbType.VarString || Type == MySqlDbType.VarChar ||
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(IsBlob && !IsBinary);
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}
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}
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public int CharacterLength
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{
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get { return ColumnLength / MaxLength; }
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}
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public List<Type> TypeConversions
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{
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get { return typeConversions; }
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}
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#endregion
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public void SetTypeAndFlags(MySqlDbType type, ColumnFlags flags)
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{
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colFlags = flags;
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mySqlDbType = type;
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if (String.IsNullOrEmpty(TableName) && String.IsNullOrEmpty(RealTableName) &&
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driver.Settings.FunctionsReturnString)
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{
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mySqlDbType = MySqlDbType.VarString;
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// we are treating a binary as string so we have to choose some
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// charset index. Connection seems logical.
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CharacterSetIndex = driver.ConnectionCharSetIndex;
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binaryOk = false;
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}
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// if our type is an unsigned number, then we need
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// to bump it up into our unsigned types
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// we're trusting that the server is not going to set the UNSIGNED
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// flag unless we are a number
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if (IsUnsigned)
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{
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switch (type)
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{
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case MySqlDbType.Byte:
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mySqlDbType = MySqlDbType.UByte;
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return;
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case MySqlDbType.Int16:
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mySqlDbType = MySqlDbType.UInt16;
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return;
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case MySqlDbType.Int24:
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mySqlDbType = MySqlDbType.UInt24;
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return;
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case MySqlDbType.Int32:
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mySqlDbType = MySqlDbType.UInt32;
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return;
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case MySqlDbType.Int64:
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mySqlDbType = MySqlDbType.UInt64;
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return;
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}
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}
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if (IsBlob)
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{
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// handle blob to UTF8 conversion if requested. This is only activated
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// on binary blobs
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if (IsBinary && driver.Settings.TreatBlobsAsUTF8)
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{
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bool convertBlob = false;
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Regex includeRegex = driver.Settings.GetBlobAsUTF8IncludeRegex();
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Regex excludeRegex = driver.Settings.GetBlobAsUTF8ExcludeRegex();
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if (includeRegex != null && includeRegex.IsMatch(ColumnName))
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convertBlob = true;
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else if (includeRegex == null && excludeRegex != null &&
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!excludeRegex.IsMatch(ColumnName))
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convertBlob = true;
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if (convertBlob)
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{
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binaryOk = false;
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Encoding = System.Text.Encoding.GetEncoding("UTF-8");
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charSetIndex = -1; // lets driver know we are in charge of encoding
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maxLength = 4;
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}
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}
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if (!IsBinary)
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{
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if (type == MySqlDbType.TinyBlob)
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mySqlDbType = MySqlDbType.TinyText;
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else if (type == MySqlDbType.MediumBlob)
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mySqlDbType = MySqlDbType.MediumText;
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else if (type == MySqlDbType.Blob)
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mySqlDbType = MySqlDbType.Text;
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else if (type == MySqlDbType.LongBlob)
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mySqlDbType = MySqlDbType.LongText;
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}
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}
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// now determine if we really should be binary
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if (driver.Settings.RespectBinaryFlags)
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CheckForExceptions();
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if (Type == MySqlDbType.String && CharacterLength == 36 && !driver.Settings.OldGuids)
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mySqlDbType = MySqlDbType.Guid;
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if (!IsBinary) return;
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if (driver.Settings.RespectBinaryFlags)
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{
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if (type == MySqlDbType.String)
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mySqlDbType = MySqlDbType.Binary;
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else if (type == MySqlDbType.VarChar ||
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type == MySqlDbType.VarString)
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mySqlDbType = MySqlDbType.VarBinary;
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}
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if (CharacterSetIndex == 63)
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CharacterSetIndex = driver.ConnectionCharSetIndex;
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if (Type == MySqlDbType.Binary && ColumnLength == 16 && driver.Settings.OldGuids)
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mySqlDbType = MySqlDbType.Guid;
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}
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public void AddTypeConversion(Type t)
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{
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if (TypeConversions.Contains(t)) return;
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TypeConversions.Add(t);
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}
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private void CheckForExceptions()
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{
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string colName = String.Empty;
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if (OriginalColumnName != null)
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colName = OriginalColumnName.ToUpper(CultureInfo.InvariantCulture);
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if (colName.StartsWith("CHAR("))
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binaryOk = false;
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else if (driver.IsExecutingBuggyQuery)
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binaryOk = false;
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}
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public IMySqlValue GetValueObject()
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{
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IMySqlValue v = GetIMySqlValue(Type);
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if (v is MySqlByte && ColumnLength == 1 && driver.Settings.TreatTinyAsBoolean)
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{
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MySqlByte b = (MySqlByte)v;
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b.TreatAsBoolean = true;
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v = b;
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}
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else if (v is MySqlGuid)
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{
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MySqlGuid g = (MySqlGuid)v;
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g.OldGuids = driver.Settings.OldGuids;
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v = g;
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}
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return v;
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}
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public static IMySqlValue GetIMySqlValue(MySqlDbType type)
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{
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switch (type)
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{
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case MySqlDbType.Byte:
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return new MySqlByte();
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case MySqlDbType.UByte:
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return new MySqlUByte();
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case MySqlDbType.Int16:
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return new MySqlInt16();
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case MySqlDbType.UInt16:
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return new MySqlUInt16();
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case MySqlDbType.Int24:
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case MySqlDbType.Int32:
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case MySqlDbType.Year:
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return new MySqlInt32(type, true);
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case MySqlDbType.UInt24:
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case MySqlDbType.UInt32:
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return new MySqlUInt32(type, true);
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case MySqlDbType.Bit:
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return new MySqlBit();
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case MySqlDbType.Int64:
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return new MySqlInt64();
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case MySqlDbType.UInt64:
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return new MySqlUInt64();
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case MySqlDbType.Time:
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return new MySqlTimeSpan();
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case MySqlDbType.Date:
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case MySqlDbType.DateTime:
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case MySqlDbType.Newdate:
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case MySqlDbType.Timestamp:
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return new MySqlDateTime(type, true);
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case MySqlDbType.Decimal:
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case MySqlDbType.NewDecimal:
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return new MySqlDecimal();
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case MySqlDbType.Float:
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return new MySqlSingle();
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case MySqlDbType.Double:
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return new MySqlDouble();
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case MySqlDbType.Set:
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case MySqlDbType.Enum:
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case MySqlDbType.String:
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case MySqlDbType.VarString:
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case MySqlDbType.VarChar:
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case MySqlDbType.Text:
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case MySqlDbType.TinyText:
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case MySqlDbType.MediumText:
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case MySqlDbType.LongText:
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case (MySqlDbType) Field_Type.NULL:
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return new MySqlString(type, true);
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case MySqlDbType.Geometry:
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case MySqlDbType.Blob:
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case MySqlDbType.MediumBlob:
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case MySqlDbType.LongBlob:
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case MySqlDbType.TinyBlob:
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case MySqlDbType.Binary:
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case MySqlDbType.VarBinary:
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return new MySqlBinary(type, true);
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case MySqlDbType.Guid:
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return new MySqlGuid();
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default:
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throw new MySqlException("Unknown data type");
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}
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}
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private void SetFieldEncoding()
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{
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Hashtable charSets = driver.CharacterSets;
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DBVersion version = driver.Version;
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if (charSets == null || CharacterSetIndex == -1) return;
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if (charSets[CharacterSetIndex] == null) return;
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CharacterSet cs = CharSetMap.GetCharacterSet(version, (string)charSets[CharacterSetIndex]);
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// starting with 6.0.4 utf8 has a maxlen of 4 instead of 3. The old
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// 3 byte utf8 is utf8mb3
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if (cs.name.ToLower(System.Globalization.CultureInfo.InvariantCulture) == "utf-8" &&
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version.Major >= 6)
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MaxLength = 4;
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else
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MaxLength = cs.byteCount;
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Encoding = CharSetMap.GetEncoding(version, (string)charSets[CharacterSetIndex]);
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}
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}
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}
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