.NET的數(shù)據(jù)庫天然支持MSSQLServer，但是并非其他數(shù)據(jù)庫不支持，而是微軟基于自身利益需要，在支持、營銷上推自己的數(shù)據(jù)庫產(chǎn)品;但是作為平臺(tái)戰(zhàn)略，他并非排斥其他數(shù)據(jù)庫，而是參考java體系提出了一套數(shù)據(jù)庫訪問規(guī)范，讓各個(gè)第三方進(jìn)行開發(fā)，提供特定的驅(qū)動(dòng)。新疆軟件開發(fā)網(wǎng)搜集整理 Cq3pXq{G
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MySQL是免費(fèi)的數(shù)據(jù)庫，在成本上具有無可替代的優(yōu)勢，但是目前來講，并沒有提供。微軟把MySQL當(dāng)作ODBC數(shù)據(jù)庫，可以按照ODBC.Net規(guī)范進(jìn)行訪問，具體參考 Y.gASJL/`
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http://www.microsoft.com/china/community/Columns/Luyan/6.mspx 7s'uHx
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而實(shí)際上，針對(duì)ODBC。Net的需要配置DSN的麻煩，而是出現(xiàn)了一個(gè)開源的系統(tǒng)MySQLDriverCS，對(duì)MySQL的開發(fā)進(jìn)行了封裝，實(shí)現(xiàn)了.net環(huán)境下對(duì)于MySQL數(shù)據(jù)庫系統(tǒng)的訪問。 z} @&%"'
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http://sourceforge.net/projects/mysqldrivercs/ "Lu,8Eq
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通過閱讀源代碼，我們看到MySQLDriverCS的思路是利用C函數(shù)的底層庫來操縱數(shù)據(jù)庫的，通常提供對(duì)MySQL數(shù)據(jù)庫的訪問的數(shù)據(jù)庫的C DLL是名為libmySQL.dll的驅(qū)動(dòng)文件，MySQLDriverCS作為一個(gè).net庫進(jìn)行封裝C風(fēng)格的驅(qū)動(dòng)。 hg1; I(
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具體如何進(jìn)行呢? vR K::
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打開工程后，我們看到其中有一個(gè)比較特殊的.cs文件CPrototypes.cs： W}^NH/7E
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以下是引用片段： 8o20:OA,X
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#region LICENSE c!9zei
/* Tc %a6F:Ke
MySQLDriverCS: An C# driver for MySQL. ?2kVCs&>5
Copyright (c) 2002 Manuel Lucas Vi馻s Livschitz. a0&-H{=/z
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This file is part of MySQLDriverCS. Y4a4/ XEa
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MySQLDriverCS is free software; you can redistribute it and/or modify 4C`n2{i
it under the terms of the GNU General Public License as published by d.yK?Fj
the Free Software Foundation; either version 2 of the License, or :TNdqHcv
(at your option) any later version. |VR;,aE%\
abQ{Qw&
MySQLDriverCS is distributed in the hope that it will be useful, vg5T{~XN
but WITHOUT ANY WARRANTY; without even the implied warranty of )I{<E m3
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the {z>H&,`n
GNU General Public License for more details. A.|o {>
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You should have received a copy of the GNU General Public License I[ELwFt {W
along with MySQLDriverCS; if not, write to the Free Software p17YBfC
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA }CVb' 2 $1
*/ 0<ZV) ,<c
#endregion Xh ><glF
using System; vN2n\M^J^
using System.Data; A~wZ2I@^
using System.Runtime.InteropServices; Bz.Pc);
namespace MySQLDriverCS P7'ztDm"
{ zr/#73q&L
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//[StructLayout(LayoutKind.Sequential)] sS>v%`_
public class MYSQL_FIELD_FACTORY 9y7:F (1
{ ~wNU=*,O
static string version; x}o{'
public static IMYSQL_FIELD GetInstance() {z-8\LH s
{ =3R l\
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if (version==null) u,E*WcM/
{ Hl& Fh0k
version = CPrototypes.GetClientInfo(); `TG[y 0m
} * ^' E
if (version.CompareTo("4.1.2-alpha")＞=0) x_}JRcny^
{ {TU;3DR
return new MYSQL_FIELD_VERSION_5(); \|&;b<S!
} Gg?rNB <
else SxY- C{gR
return new MYSQL_FIELD_VERSION_3(); D8Gp1H
} m o|O`UG\
} N#UAoGIt;
public interface IMYSQL_FIELD !Lo?oG+
{ pPk 9le
string Name{get;} @ 0 u9`
uint Type{get;} 6 eF~u.i
long Max_Length {get;} g~NzFv=:G
} J 7\lW U
///＜summary＞ gFI/X!k%
/// Field descriptor = {k|[:S
///＜/summary＞ Ks*xm1l3
[StructLayout(LayoutKind.Sequential)]//"3.23.32", 4.0.1-alpha x24L"hJCK
internal class MYSQL_FIELD_VERSION_3: IMYSQL_FIELD Bs338 s{}
{ lD~XV:+
///＜summary＞ jU3x@?JH
/// Name of column |D 7PRio
///＜/summary＞ li:UK][l@
public string name; *\vn1`%
///＜summary＞ d@wVr A!
/// Table of column if column was a field 9Y<Z}E$g9
///＜/summary＞ c|7@^h`
public string table; KJOh/.mM
//public string org_table; /* Org table name if table was an alias */ E ^eS
//public string db; /* Database for table */ \uNZ&qy(
///＜summary＞ ~k!qd9YN3
/// def "%qp?R-zy
///＜/summary＞ x|* y;dB
public string def; Y'% s'k
///＜summary＞ ^xv<MQ^N
/// length hAL Ul/_
///＜/summary＞ eUl0Q
public long length; _]=K&~@/s
///＜summary＞ !@"i+8]6V
/// max_length BkaMb,~
///＜/summary＞ ,CpX fEm
public long max_length; =$IYhuS~
///＜summary＞ O4pj~uQ7
/// Div flags L+]=g(@E
///＜/summary＞ \,| 3p
public uint flags; % ty'Z&&k
///＜summary＞ MXF> HW
/// Number of decimals in field MyeO+IF2
///＜/summary＞ $;bff"bO
public uint decimals; $4ht`R
///＜summary＞ =0) C3:q
/// Type of field. Se mysql_com.h for types ka-n[Hz
///＜/summary＞ W]]-N Wk
public uint type; t.!9<p =>
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///＜summary＞ %q!1 M-8
/// Name V/ hP
///＜/summary＞ <L{Vx+0I
public string Name !%L~p]|w
{ 1oe C&se
get{return name;} ^h5qUrulL
} EmT{#o9
///＜summary＞ a cU#;]"s
/// Type # !!MQTk
///＜/summary＞ P`a-C3FF
public uint Type K4u$ 4)as
{ P LHr)
get{return type;} @uync8?%
} cp)NZWz
///＜summary＞ g= ?e3 .
/// Max_Length V#@ VsgKK
///＜/summary＞ # L h~CpnS
public long Max_Length CJ"Be'u Xy
{ 2H*2N=
get {return max_length;} \gTV[ OB
} ~$?~NiZ,)
} +`xIuic
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///＜summary＞ ~`fOP Q
/// Field descriptor HR~+yFp8
///＜/summary＞ _;{_m{u
[StructLayout(LayoutKind.Sequential)] u >^|OcW
internal class MYSQL_FIELD_VERSION_5: IMYSQL_FIELD cJ|h=mv
{ T&"ao4Io}
///＜summary＞ /T\|=Q
/// Name of column z QP *t~
///＜/summary＞ OC;|% s#m
public string name; pM`#7lE
///＜summary＞ 4^Kk?ib}L
/// Original column name, if an alias ,Ah B !(
///＜/summary＞ @SKjhi
public string org_name; tn6$ Px
///＜summary＞ : + S>8
/// Table of column if column was a field j vA%b
///＜/summary＞ %LO&\{,1U
public string table; `#'kUYQ[]
///＜summary＞ }ifhThTa
/// Org table name if table was an alias 'shu2(
///＜/summary＞ e9n3sv/
public string org_table; oL /UPl`7s
///＜summary＞ gRUxL
/// Database for table %q0D+[ TV
///＜/summary＞ wh c fX
public string db; Ga+v @,J1
///＜summary＞ c~ zR(B O
/// Catalog for table 7yOn''N
///＜/summary＞ s]o o~DX
//public string catalog; '.3l 8!
///＜summary＞ 9 *iRa %:^
/// def 4e6Pm :
///＜/summary＞ c_OFJ 3n!n
public string def; i'{<D7(
///＜summary＞ &6&PjZfIL
/// length YU ubM" 7
///＜/summary＞ a$"z$<Y.
public long length; 1s n 7xaj
///＜summary＞ y$?8 _L
/// max_length 9bf0+h)9
///＜/summary＞ i4rkoekJ
public long max_length; AW9j3UE
///＜summary＞ 5+~' R{~~
/// name_length Ic3BE2r
///＜/summary＞ }^-uv; d\
//public uint name_length; ]x~OXF'I~
///＜summary＞ !G5)q> {
/// org_name_length *AYo\u
///＜/summary＞ ^. _|FT
public uint org_name_length; |u]S)TcVju
///＜summary＞ lF_DBPFko
/// table_length d_})1S~SB
///＜/summary＞ t & v
public uint table_length; PB.LF
///＜summary＞ A@M &ah :
/// org_table_length Ws[LxBkE
///＜/summary＞ R#Nam BWl
public uint org_table_length; Fo` lo.)*]
///＜summary＞ IY :EX#)
/// db_length p $zIXQ( g
///＜/summary＞ q`YSi
public uint db_length; 38 <39Lz
///＜summary＞ rK2HZ 5
/// catalog_length 'xTgSf.
///＜/summary＞ 5Do & #G 9
public uint catalog_length; -@K*sQ
///＜summary＞ ;2dxdUUQj
/// def_length -SmSW /
///＜/summary＞ @.c(LzxKc
public uint def_length; 4=M-fv% #
///＜summary＞ NM ?F7b]?
/// Div flags jq26D$>K
///＜/summary＞ { .,'>hw>U
public uint flags; ,Tl:9y?2
///＜summary＞ /%8jto(
/// Number of decimals in field XoPL-GBa
///＜/summary＞ 5 /[s^/eE
public uint decimals; ;WR%0fp'
///＜summary＞ NYA^xh
/// Character set G}Vh;%T#
///＜/summary＞ -=]HbX@i
public uint charsetnr; ?Rvu`
///＜summary＞ U!w11 P
/// Type of field. Se mysql_com.h for types hFch #a-;
///＜/summary＞ ua#[^I+&
public uint type; g{\.V(
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///＜summary＞ #[}2KA QLx
/// Name ML[?hj
///＜/summary＞ (njL[#u2
public string Name J0 {iXI
{ p*%pk=
get {return name;} E'Sy d\
} +n%73=
///＜summary＞ 8:o"
/// Type odNkG:R.
///＜/summary＞ "?{2) +G
public uint Type Oi) 5r} f
{ Y3:5YSTk
get {return type;} >y"tuh5:H
} %^W.i" H0f
///＜summary＞ *b,:5lKXK
/// Max_Length D,R{vjP-
///＜/summary＞ bZ>6V0{=
public long Max_Length w,lz]Y,
{ Fcbf "T2J
get {return max_length;} 4>8#Q 0
} qaLYL`ak
} !]EC`]zYj
//[StructLayout(LayoutKind.Explicit)] c|*`s.gh
public enum enum_field_types +vN".EU
{ $hsOZdR
FIELD_TYPE_DECIMAL, FIELD_TYPE_TINY, oCCa
FIELD_TYPE_SHORT, FIELD_TYPE_LONG, "b.gK6
FIELD_TYPE_FLOAT, FIELD_TYPE_DOUBLE, >*l2R6qzn
FIELD_TYPE_NULL, FIELD_TYPE_TIMESTAMP, , 2y8(
FIELD_TYPE_LONGLONG,FIELD_TYPE_INT24, +;G^bx_ #|
FIELD_TYPE_DATE, FIELD_TYPE_TIME, @?@J;
FIELD_TYPE_DATETIME, FIELD_TYPE_YEAR, RDFx i=&a
FIELD_TYPE_NEWDATE, b?eIjkn
FIELD_TYPE_ENUM=247, e!J|c^c5'
FIELD_TYPE_SET=248, x [c2/a_X
FIELD_TYPE_TINY_BLOB=249, $f0c'%UW
FIELD_TYPE_MEDIUM_BLOB=250, 5Qd_2e`
FIELD_TYPE_LONG_BLOB=251, \kvZ/>G3xZ
FIELD_TYPE_BLOB=252, 6p \=sL
FIELD_TYPE_VAR_STRING=253, 6tN!'l+P
FIELD_TYPE_STRING=254, 2w h/#
FIELD_TYPE_GEOMETRY=255 m mZ .
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}; *7FLogi
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///＜summary＞ r?-2sCQF
/// C prototypes warpper for mysqllib. ]3|LTB=wO
///＜/summary＞ `I/ub
internal class CPrototypes \!f YFt
{ %eW`W/i]
[ DllImport( "libmySQL.dll", EntryPoint="mysql_init" )] jZ-PZMhFl
unsafe public static extern void* mysql_init(void* must_be_null); r1]5!0EvNB
[ DllImport( "libmySQL.dll", EntryPoint="mysql_close" )] Su$Pi
unsafe public static extern void mysql_close(void* handle); @vS xG$Tz
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// BEGIN ADDITION 2004-07-01 BY Alex Seewald YQC8O Q
// Enables us to call mysql_option to activate compression and timeout Uamz\o
[ DllImport( "libmySQL.dll", EntryPoint="mysql_options" )] 5 k.D8%M
unsafe public static extern void mysql_options(void* mysql, uint option, uint *value); fMFUyx!L
// END ADDITION 2004-07-01 By Alex Seewald V4:Qd~+}
[ DllImport( "libmySQL.dll", EntryPoint="mysql_real_connect" )] ]t}}T '
unsafe public static extern void* mysql_real_connect(void* mysql, string host, string user, string passwd, string db, uint port, string unix_socket, int client_flag); ";b`Dt-9k
[ DllImport( "libmySQL.dll", EntryPoint="mysql_query" )] 17Yzeyo
unsafe public static extern int mysql_query(void*mysql, string query); ErSB8FL]
[ DllImport( "libmySQL.dll", EntryPoint="mysql_store_result" )] 4:l5+$
unsafe public static extern void *mysql_store_result(void *mysql); ct$7{ 9
[ DllImport( "libmySQL.dll", EntryPoint="mysql_free_result" )] 6pkNC\a
unsafe public static extern void mysql_free_result(void*result); ;(n0)
[ DllImport( "libmySQL.dll", EntryPoint="mysql_errno" )] yM6{+<}
unsafe public static extern uint mysql_errno(void*mysql); _+BIqsZ[8q
[ DllImport( "libmySQL.dll", EntryPoint="mysql_error" )] Mr)GhH.\
unsafe public static extern string mysql_error(void*mysql); ?rIqSfE_
[ DllImport( "libmySQL.dll", EntryPoint="mysql_field_count" )] }yq
unsafe public static extern uint mysql_field_count(void*mysql); bn3&D^"!
[ DllImport( "libmySQL.dll", EntryPoint="mysql_affected_rows" )] Xd?.}9|
unsafe public static extern ulong mysql_affected_rows(void*mysql); S*~ >6>2P
[ DllImport( "libmySQL.dll", EntryPoint="mysql_num_fields" )] Zl6Kr8T5
unsafe public static extern uint mysql_num_fields(void*result); !cI{ j(_
[ DllImport( "libmySQL.dll", EntryPoint="mysql_num_rows" )] ;]S{Rw3 K[
unsafe public static extern ulong mysql_num_rows(void *result); $rNRB:
[ DllImport( "libmySQL.dll", EntryPoint="mysql_fetch_field_direct" )] S}Wmnx %
unsafe public static extern IntPtr mysql_fetch_field_direct(void*result, uint fieldnr); x`((=!
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///＜returns＞Returns a string that represents the client library version＜/returns＞ (ghqCOT Xl
[DllImport("libmySQL.dll",CharSet=System.Runtime.InteropServices.CharSet.Ansi, c12`"Ng
EntryPoint="mysql_get_client_info", ExactSpelling=true)] W!grr}4OU9
public static extern string GetClientInfo(); =q>F* !(N
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[ DllImport( "libmySQL.dll", EntryPoint="mysql_fetch_row" )] w$@:Ss[d
unsafe public static extern IntPtr mysql_fetch_row(void*result); cRhkNI $
[ DllImport( "libmySQL.dll", EntryPoint="mysql_select_db" )] 0n O38
unsafe public static extern int mysql_select_db(void*mysql,string dbname); W[VeoO
[ DllImport( "libmySQL.dll", EntryPoint="mysql_fetch_lengths" )] }tI` n Hc
unsafe public static extern UInt32 *mysql_fetch_lengths(void*result); knVy6H
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} a]pC6 (g
} m.r5 4(t
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基本上是將C風(fēng)格的基礎(chǔ)數(shù)據(jù)結(jié)構(gòu)進(jìn)行.net的重新定義，然后通過InteropServices進(jìn)行訪問。 n KcJ#y9
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具體如何利用這個(gè)庫進(jìn)行操作，可以參考其中的例子。
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