《Mysql實例dmysql自己封裝的mysql庫》要點：
本文介紹了Mysql實例dmysql自己封裝的mysql庫，希望對您有用。如果有疑問，可以聯系我們。

怎么系統分類里面沒有CGI啊?

最近好久沒有發原創文章了,都在架構服務器,編寫CGI程序
開頭用了些天perl,后來發現對腳本語言尤其是特別牛X的正則表達式有些看不懂...
回頭用C語言寫高效率的吧,反正我自己寫過好些C的庫了...

下面貼一個mysql的庫,叫做dmysql
解壓縮以后,make?;?make?install?安裝
然后編譯程序的時候,包含dmysql.h頭文件,加上?-ldmysql標識,即可

頭里面定義了一個mysql數據庫的結構體,

typedef?struct?_dmysql_info
{
?????char?*host;?/*host?for?database*/
?????char?*user;?/*user?name?for?database*/
?????char?*pswd;?/*password?to?the?account*/
?????char?*dbbs;?/*name?of?database*/
}?dmysql_info;



記錄集的數據類型
typedef?struct?_dmysql_record
{
?????char?*s_str;
}?dmysql_record;


typedef?struct?_dmysql_row
{
?????dmysql_record?*s_record;
}?dmysql_row;


typedef?struct?_d_mysql_res
{
?????int?row;
?????int?field;
?????dmysql_row?*s_row;
}?dmysql_res;



還有程序運行時候的出錯代碼
#define?DMYSQL_QUERY_OKAY?0
#define?DMYSQL_SELECT_OKAY?0
#define?DMYSQL_CONNECT_ERROR?-1
#define?DMYSQL_INIT_ERROR?-2
#define?DMYSQL_QUERY_ERROR?-3
#define?DMYSQL_RES_ERROR?-4




程序一共就3個函數
extern?int?dmysql_query(?const?char?*?s_query,?const?dmysql_info?mysql_info?);

給出一句執行的SQL命令,比如UPDATE、INSERT,指定一個數據庫,就可以了


extern?int?dmysql_select(?dmysql_res?**rel_res,?const?char?*s_select,?const?dmysql_info?mysql_info?);


傳入一個數據庫記錄集的地址,給出一個SELECT記錄的SQL命令,再制定一個數據庫,就可以了


用來釋放內存中在棧里面申明了的記錄集空間

extern?void?dmysql_free(?dmysql_res?*res?);



下面是演示的程序代碼：
#include?<stdio.h>
#include?<dmysql.h>

int?main(?void?)
{
????dmysql_info?db;
????db.host="127.0.0.1";?/*host?for?database*/
????db.user="root";?/*user?name?for?database*/
????db.pswd="";?/*password?to?the?account*/
????db.dbbs="mysql";?/*name?of?database*/

????char?*s_query="GRANT?ALL?ON?*.*?to?'dorainm'@'127.0.0.1'?IDENTIFIED?BY?'******';";
????char?*s_sql="SELECT?`user`,`host`,`password`?FROM?`user`;";

????int?i,?j;
????dmysql_res?*res;

????dmysql_query(?s_query,?db?);


????printf(?"select?out?:?%d\n",?dmysql_select(?&res,?s_sql,?db?)?);
????for(?i=0;?i<res->row;?i++?)
????{
????????for(?j=0;?j<res->field;?j++?)
????????{
????????????printf("%s\t",?((res->s_row+i)->s_record+j)->s_str?);
????????}
????????printf(?"\n"?);
????}
????dmysql_free(?res?);

????return?0;
};

?


make?test后運行./dmysql

dorainm@desktop:~/workroom/c/mylib/dmysql$?make?test?gcc?-Wall?-O3?-o?dmysql?main.c?-ldmysql?`mysql_config?--libs`?`mysql_config?--cflags`?dorainm@desktop:~/workroom/c/mylib/dmysql$?./dmysql

select?out?:?5
root?localhost?%^$#!@%*&!
root?desktop.dorainm.org?%^$#!@%*&!?
?desktop.dorainm.org?%^$#!@%*&!?
?localhost?%^$#!@%*&!
dorainm?127.0.0.1?%^$#!@%*&!?dorainm@desktop:~/workroom/c/mylib/dmysql$?

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