技巧 .NET如何访问MySQL数据库
日期：2011-01-21 浏览次数：20522 次
.NET的数据库天然支持MSSQLServer，但是并非其他数据库不支持，而是微软基于自身利益需要，在支持、营销上推自己的数据库产品;但是作为平台战略，他并非排斥其他数据库，而是参考java体系提出了一套数据库访问规范，让各个第三方进行开发，提供特定的驱动。
MySQL是免费的数据库，在成本上具有无可替代的优势，但是目前来讲，并没有提供。微软把MySQL当作ODBC数据库，可以按照ODBC.Net规范进行访问，具体参考
http://www.microsoft.com/china/community/Columns/Luyan/6.mspx
而实际上，针对ODBC。Net的需要配置DSN的麻烦，而是出现了一个开源的系统MySQLDriverCS，对MySQL的开发进行了封装，实现了.net环境下对于MySQL数据库系统的访问。
http://sourceforge.net/projects/mysqldrivercs/
通过阅读源代码，我们看到MySQLDriverCS的思路是利用C函数的底层库来操纵数据库的，通常提供对MySQL数据库的访问的数据库的C DLL是名为libmySQL.dll的驱动文件，MySQLDriverCS作为一个.net库进行封装C风格的驱动。
具体如何进行呢?
打开工程后，我们看到其中有一个比较特殊的.cs文件CPrototypes.cs：
以下是引用片段：
#region LICENSE
/*
MySQLDriverCS: An C# driver for MySQL.
Copyright (c) 2002 Manuel Lucas Vi馻s Livschitz.
This file is part of MySQLDriverCS.
MySQLDriverCS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
MySQLDriverCS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with MySQLDriverCS; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#endregion
using System;
using System.Data;
using System.Runtime.InteropServices;
namespace MySQLDriverCS
{
//[StructLayout(LayoutKind.Sequential)]
public class MYSQL_FIELD_FACTORY
{
static string version;
public static IMYSQL_FIELD GetInstance()
{
if (version==null)
{
version = CPrototypes.GetClientInfo();
}
if (version.CompareTo("4.1.2-alpha")＞=0)
{
return new MYSQL_FIELD_VERSION_5();
}
else
return new MYSQL_FIELD_VERSION_3();
}
}
public interface IMYSQL_FIELD
{
string Name{get;}
uint Type{get;}
long Max_Length {get;}
}
///＜summary＞
/// Field descriptor
///＜/summary＞
[StructLayout(LayoutKind.Sequential)]//"3.23.32", 4.0.1-alpha
internal class MYSQL_FIELD_VERSION_3: IMYSQL_FIELD
{
///＜summary＞
/// Name of column
///＜/summary＞
public string name;
///＜summary＞
/// Table of column if column was a field
///＜/summary＞
public string table;
//public string org_table; /* Org table name if table was an alias */
//public string db; /* Database for table */
///＜summary＞
/// def
///＜/summary＞
public string def;
///＜summary＞
/// length
///＜/summary＞
public long length;
///＜summary＞
/// max_length
///＜/summary＞
public long max_length;
///＜summary＞
/// Div flags
///＜/summary＞
public uint flags;
///＜summary＞
/// Number of decimals in field
///＜/summary＞
public uint decimals;
///＜summary＞
/// Type of field. Se mysql_com.h for types
///＜/summary＞
public uint type;
///＜summary＞
/// Name
///＜/summary＞
public string Name
{
get{return name;}
}
///＜summary＞
/// Type
///＜/summary＞
public uint Type
{
get{return type;}
}
///＜summary＞
/// Max_Length
///＜/summary＞
public long Max_Length
{
get {return max_length;}
}
}
///＜summary＞
/// Field descriptor
///＜/summary＞
[Str
MySQL是免费的数据库，在成本上具有无可替代的优势，但是目前来讲，并没有提供。微软把MySQL当作ODBC数据库，可以按照ODBC.Net规范进行访问，具体参考
http://www.microsoft.com/china/community/Columns/Luyan/6.mspx
而实际上，针对ODBC。Net的需要配置DSN的麻烦，而是出现了一个开源的系统MySQLDriverCS，对MySQL的开发进行了封装，实现了.net环境下对于MySQL数据库系统的访问。
http://sourceforge.net/projects/mysqldrivercs/
通过阅读源代码，我们看到MySQLDriverCS的思路是利用C函数的底层库来操纵数据库的，通常提供对MySQL数据库的访问的数据库的C DLL是名为libmySQL.dll的驱动文件，MySQLDriverCS作为一个.net库进行封装C风格的驱动。
具体如何进行呢?
打开工程后，我们看到其中有一个比较特殊的.cs文件CPrototypes.cs：
以下是引用片段：
#region LICENSE
/*
MySQLDriverCS: An C# driver for MySQL.
Copyright (c) 2002 Manuel Lucas Vi馻s Livschitz.
This file is part of MySQLDriverCS.
MySQLDriverCS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
MySQLDriverCS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with MySQLDriverCS; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#endregion
using System;
using System.Data;
using System.Runtime.InteropServices;
namespace MySQLDriverCS
{
//[StructLayout(LayoutKind.Sequential)]
public class MYSQL_FIELD_FACTORY
{
static string version;
public static IMYSQL_FIELD GetInstance()
{
if (version==null)
{
version = CPrototypes.GetClientInfo();
}
if (version.CompareTo("4.1.2-alpha")＞=0)
{
return new MYSQL_FIELD_VERSION_5();
}
else
return new MYSQL_FIELD_VERSION_3();
}
}
public interface IMYSQL_FIELD
{
string Name{get;}
uint Type{get;}
long Max_Length {get;}
}
///＜summary＞
/// Field descriptor
///＜/summary＞
[StructLayout(LayoutKind.Sequential)]//"3.23.32", 4.0.1-alpha
internal class MYSQL_FIELD_VERSION_3: IMYSQL_FIELD
{
///＜summary＞
/// Name of column
///＜/summary＞
public string name;
///＜summary＞
/// Table of column if column was a field
///＜/summary＞
public string table;
//public string org_table; /* Org table name if table was an alias */
//public string db; /* Database for table */
///＜summary＞
/// def
///＜/summary＞
public string def;
///＜summary＞
/// length
///＜/summary＞
public long length;
///＜summary＞
/// max_length
///＜/summary＞
public long max_length;
///＜summary＞
/// Div flags
///＜/summary＞
public uint flags;
///＜summary＞
/// Number of decimals in field
///＜/summary＞
public uint decimals;
///＜summary＞
/// Type of field. Se mysql_com.h for types
///＜/summary＞
public uint type;
///＜summary＞
/// Name
///＜/summary＞
public string Name
{
get{return name;}
}
///＜summary＞
/// Type
///＜/summary＞
public uint Type
{
get{return type;}
}
///＜summary＞
/// Max_Length
///＜/summary＞
public long Max_Length
{
get {return max_length;}
}
}
///＜summary＞
/// Field descriptor
///＜/summary＞
[Str
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