知识大全 .NET如何访问MySQL数据库

Posted 2022-07-18 数据库

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　　 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　　　　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环境下对于MySQL数据库系统的访问　　　　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) Manuel Lucas Vi馻s Livschitz This file is part of MySQLDriverCS MySQLDriverCS is free sofare; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Sofare Foundation; either version 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 Sofare Foundation Inc Temple Place Suite Boston MA 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( alpha )＞= ) return new MYSQL_FIELD_VERSION_ (); else return new MYSQL_FIELD_VERSION_ (); public interface IMYSQL_FIELD string Nameget; uint Typeget; long Max_Length get;

　　 ///＜summary＞ /// Field descriptor ///＜/summary＞ [StructLayout(LayoutKind Sequential)]// alpha internal class MYSQL_FIELD_VERSION_ : 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 _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_ h for types ///＜/summary＞ public uint type; ///＜summary＞ /// Name ///＜/summary＞

　　public string Name getreturn name; ///＜summary＞ /// Type ///＜/summary＞ public uint Type getreturn type; ///＜summary＞ /// Max_Length ///＜/summary＞ public long Max_Length get return max_length; ///＜summary＞ /// Field descriptor ///＜/summary＞ [StructLayout(LayoutKind Sequential)] internal class MYSQL_FIELD_VERSION_ : IMYSQL_FIELD ///＜summary＞ /// Name of column ///＜/summary＞ public string name; ///＜summary＞ /// Original column name if an alias ///＜/summary＞ public string _name; ///＜summary＞ /// Table of column if column was a field ///＜/summary＞ public string table; ///＜summary＞ /// Org table name if table was an alias ///＜/summary＞

　　public string _table; ///＜summary＞ /// Database for table ///＜/summary＞ public string db; ///＜summary＞ /// Catalog for table ///＜/summary＞ //public string catalog; ///＜summary＞ /// def ///＜/summary＞ public string def; ///＜summary＞ /// length ///＜/summary＞ public long length; ///＜summary＞ /// max_length ///＜/summary＞ public long max_length; ///＜summary＞ /// name_length ///＜/summary＞ //public uint name_length; ///＜summary＞ /// _name_length ///＜/summary＞ public uint _name_length; ///＜summary＞ /// table_length ///＜/summary＞ public uint table_length; ///＜summary＞ /// _table_length ///＜/summary＞ public uint _table_length; ///＜summary＞ /// db_length ///＜/summary＞

　　public uint db_length; ///＜summary＞ /// catalog_length ///＜/summary＞ public uint catalog_length; ///＜summary＞ /// def_length ///＜/summary＞ public uint def_length; ///＜summary＞ /// Div flags ///＜/summary＞ public uint flags; ///＜summary＞ /// Number of decimals in field ///＜/summary＞ public uint decimals; ///＜summary＞ /// Character set ///＜/summary＞ public uint charsetnr; ///＜summary＞ /// Type of field Se mysql_ 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;

　　//[StructLayout(LayoutKind Explicit)] public enum enum_field_types FIELD_TYPE_DECIMAL FIELD_TYPE_TINY FIELD_TYPE_SHORT FIELD_TYPE_LONG FIELD_TYPE_FLOAT FIELD_TYPE_DOUBLE FIELD_TYPE_NULL FIELD_TYPE_TIMESTAMP FIELD_TYPE_LONGLONG FIELD_TYPE_INT FIELD_TYPE_DATE FIELD_TYPE_TIME FIELD_TYPE_DATETIME FIELD_TYPE_YEAR FIELD_TYPE_NEWDATE FIELD_TYPE_ENUM= FIELD_TYPE_SET= FIELD_TYPE_TINY_BLOB= FIELD_TYPE_MEDIUM_BLOB= FIELD_TYPE_LONG_BLOB= FIELD_TYPE_BLOB= FIELD_TYPE_VAR_STRING= FIELD_TYPE_STRING= FIELD_TYPE_GEOMETRY= ; ///＜summary＞ /// C prototypes warpper for mysqllib ///＜/summary＞ internal class CPrototypes [ DllImport( libmySQL dll EntryPoint= mysql_init )] unsafe public static extern void* mysql_init(void* must_be_null); [ DllImport( libmySQL dll EntryPoint= mysql_close )] unsafe public static extern void mysql_close(void* handle); // BEGIN ADDITION BY Alex Seewald // Enables us to call mysql_option to activate pression and timeout [ DllImport( libmySQL dll EntryPoint= mysql_options )] unsafe public static extern void mysql_options(void* mysql uint option uint *value); // END ADDITION By Alex Seewald

　　[ DllImport( libmySQL dll EntryPoint= mysql_real_connect )] unsafe public static extern void* mysql_real_connect(void* mysql string host string user string passwd string db uint port string unix_socket int client_flag); [ DllImport( libmySQL dll EntryPoint= mysql_query )] unsafe public static extern int mysql_query(void*mysql string query); [ DllImport( libmySQL dll EntryPoint= mysql_store_result )] unsafe public static extern void *mysql_store_result(void *mysql); [ DllImport( libmySQL dll EntryPoint= mysql_free_result )] unsafe public static extern void mysql_free_result(void*result); [ DllImport( libmySQL dll EntryPoint= mysql_errno )] unsafe public static extern uint mysql_errno(void*mysql); [ DllImport( libmySQL dll EntryPoint= mysql_error )] unsafe public static extern string mysql_error(void*mysql); [ DllImport( libmySQL dll EntryPoint= mysql_field_count )] unsafe public static extern uint mysql_field_count(void*mysql); [ DllImport( libmySQL dll EntryPoint= mysql_affected_rows )] unsafe public static extern ulong mysql_affected_rows(void*mysql); [ DllImport( libmySQL dll EntryPoint= mysql_num_fields )] unsafe public static extern uint mysql_num_fields(void*result); [ DllImport( libmySQL dll EntryPoint= mysql_num_rows )] unsafe public static extern ulong mysql_num_rows(void *result); [ DllImport( libmySQL dll EntryPoint= mysql_fetch_field_direct )] unsafe public static extern IntPtr mysql_fetch_field_direct(void*result uint fieldnr); ///＜returns＞Returns a string that represents the client library version＜/returns＞ [DllImport( libmySQL dll CharSet=System Runtime InteropServices CharSet Ansi EntryPoint= mysql_get_client_info ExactSpelling=true)] public static extern string GetClientInfo(); [ DllImport( libmySQL dll EntryPoint= mysql_fetch_row )] unsafe public static extern IntPtr mysql_fetch_row(void*result); [ DllImport( libmySQL dll EntryPoint= mysql_select_db )] unsafe public static extern int mysql_select_db(void*mysql string dbname); [ DllImport( libmySQL dll EntryPoint= mysql_fetch_lengths )] unsafe public static extern UInt *mysql_fetch_lengths(void*result);

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