linux下mysql函数的详细案列

 MYSQL  *    STDCALL mysql_real_connect(MYSQL *mysql, const char *host,

                                            const char *user,

                                            const char *passwd,

                                            unsigned int port,

                                            const char *unix_socket,

                                            unsigned int clientflag);

1. 如何连接数据mysql数据库...。

[gxjun@localhost Mysql]$ cat demo.c

 //connect to mysql

 #include<stdio.h>

 #include"mysql.h"

 int main (void)

 {

   MYSQL mysql;                  //need a instance to init

   int t, r;                     //connect the database

   mysql_init (&mysql);

   if (!mysql_real_connect

       (&mysql, "localhost", "root", "", "demo", , NULL, ))

     {

       printf ("Error connecting to database:%s\n", mysql_error (&mysql));

     }

   else

     {

       printf ("Connected MYSQL successfully!\n");

     }

   mysql_close (&mysql);

   return ;

 }

2.关于make文件的内容：

[gxjun@localhost Mysql]$ cat demo.mk

 .SUFFIXES: .o .c

 CC = gcc

 SRC = demo.c

 OBJS = $(SRC : .c = .o)

 EXEC = demo

 .PHONY: start

 start: $(OBJS)

         $(CC)   -o $(EXEC) $(OBJS)    -I/usr/include/mysql -L/usr/lib/mysql -lmysqlclient

 $(OBJS): $(SRC)

         $(CC)  -g  -Wall $(OBJS) -c $(SRC)  #-I/usr/include/mysql  -L/usr/lib/mysql  -lmysqlclient

 .PHONY: clean

 clean:

          rm -f $(OBJS)

几点说明，对于MYSQL数据库程序进行编译，无法像编译普通程序那样，而是要制定include路径，库文件路径和链接模块mysqlclient , 在某些系统上，可能还要用-lz选项链接压缩库。假设MYSQL的头文件在、usr/include/mysql 路径下，库文件在/usr/lib/mysql 路径下，则执行如下命令

-I/usr/include/mysql -L/usr/lib/mysql -lmysqlclient

3. 进行make编译： make -f demo.mk

二：数据查询函数

[gxjun@localhost demo1]$ cat query.c
//select.c

 #include<stdio.h>

 #include"mysql.h"

 int main (void)

 {

   MYSQL mysql;

   MYSQL_RES *res;

   MYSQL_ROW row;

   char *query;

   int flag, t;                  //connect the database

   mysql_init (&mysql);

   if (!mysql_real_connect

       (&mysql, "localhost", "root", "", "demo", , NULL, ))

     {

       printf ("Failed to connect to Mysql! \n");

       return ;

     }

   else

     {

       printf ("Connected MySQL successfully!\n");

       query = "select * from student";

       flag = mysql_real_query (&mysql, query, (unsigned int) strlen (query));

       if (flag)

         {

           printf ("query failed ! \n");

           return ;

         }

       else

         {

           printf ("[ %s ] made...\n", query);

         }

       res = mysql_store_result (&mysql);

       while (row = mysql_fetch_row (res))

         {

           for (t = ; t < mysql_num_fields (res); t++)

             printf ("%s  ", row[t]);

           printf ("\n");

         }

       mysql_close (&mysql);

       return ;

     }

   return ;

 }

函数关于Mysql查询语句：

（1） int STDCALL mysql_query(MYSQL *mysql, const char *q);

（2） int STDCALL mysql_real_query(MYSQL *mysql, const char *q, unsigned int length);

关于这两个函数，使用较多的为（2）式

//makefile文件....

[gxjun@localhost demo1]$ cat query.mk

 .SUFFIXES: .o .c

 CC = gcc

 SRC = query.c

 OBJS = $(SRC: .c = .o)

 EXEC = Demo

 CLS = rm

 .PHONY: start

 start: $(OBJS)

         $(CC) -o $(EXEC)   $(OBJS) -I/usr/include/mysql -L/usr/lib/mysql -lmysqlclient

 $(OBJS): $(SRC)

         $(CC) -g -Wall $(OBJS) -c $(SRC)   -I/usr/include/mysql -L/usr/lib/mysql -lmysqlclient

 .PHONY: clean

 clean:

         $(CLS) -f $(OBJS)

关于bash 语言：

[gxjun@localhost demo1]$ cat query.sh

    indent -gnu query.c

          echo "make is running ....!"

          make -f query.mk

          echo "make is stopping ....! "

使用关于nm 查看想要看的函数；

[gxjun@localhost demo1]$ nm Demo

08049aac A __bss_start
080485d0 t call_gmon_start
08049aac b completed.1
08049a64 d __CTOR_END__
08049a60 d __CTOR_LIST__
08049984 D __data_start
08049984 W data_start
08048864 t __do_global_ctors_aux
080485f4 t __do_global_dtors_aux
08049988 D __dso_handle
08049a6c d __DTOR_END__
08049a68 d __DTOR_LIST__
08049990 A _DYNAMIC
08049aac A _edata
08048980 r __EH_FRAME_BEGIN__
08049ab0 A _end
08048888 T _fini
08049984 A __fini_array_end
08049984 A __fini_array_start
080488c0 R _fp_hw
08048630 t frame_dummy
08048980 r __FRAME_END__
08049a74 A _GLOBAL_OFFSET_TABLE_
         w __gmon_start__
080484e4 T _init
08049984 A __init_array_end
08049984 A __init_array_start
080488c4 R _IO_stdin_used
08049a70 d __JCR_END__
08049a70 d __JCR_LIST__
         w _Jv_RegisterClasses
08048830 T __libc_csu_fini
08048800 T __libc_csu_init
         U __libc_start_main@@GLIBC_2.0
0804865c T main
         U mysql_close
         U mysql_fetch_row
         U mysql_init
         U mysql_num_fields
         U mysql_real_connect
         U mysql_real_query
         U mysql_store_result
0804998c d p.0
         U printf@@GLIBC_2.0
080485ac T _start
         U strlen@@GLIBC_2.0

我们想要查询的表单：

mysql> select * from student
-> ;
+------+-------+
| sno | sname |
+------+-------+
| 1001 | jim |
+------+-------+
1 row in set (0.05 sec)

关于MYSQL函数查询结果:

[gxjun@localhost demo1]$ ./Demo

Connected MySQL successfully!
[ select * from student ] made...
1001 jim

---------------------------------------------华丽丽的分割线-----------------------------------------------------

关于数据库的插入和查询以及连接的综合案列：

[gxjun@localhost demo2]$ cat adddata.c

 #include<stdio.h>

 #include<string.h>

 #include<stdlib.h>

 #include "mysql.h"

 //#include<fcntl.h>

 int

 main (void)

 {

   MYSQL mysql;                  //var mysql

   MYSQL_RES *res;               //grep_result

   MYSQL_ROW row;                //mysql_row

   int r;                        //var_tmp  r

   char *query[];

   int flag;

   //init_mysql

   mysql_init (&mysql);

   if (!mysql_real_connect

       (&mysql, "localhost", "root", "", "demo", , NULL, ))

     {

       printf ("can't connect the mysql ! errInfo=[%s]", mysql_error (&mysql));

     }

   else

     {

       printf ("connect the mysql successfully!");

       query[] = "insert into student(sno,sname)values(1002,'tom')";

       query[] = "insert into student(sno,sname)values(1003,'gongxijun')";

       query[] = "insert into student(sno,sname)values(1004,'qinshihuang')";

 //insert data to mysql

       for (r = ; r < ; r++)

         {

           if (mysql_real_query

               (&mysql, query[r], (unsigned int) strlen (query[r])))

             {

               printf ("insert data[%d] is failed !\n", r);

               return ;

             }

           else

             {

               printf ("Insert data[%d] is successfully !\n", r);

             }

         }

     }

 //query part

   query[] = "select * from student";

   flag =

     mysql_real_query (&mysql, query[], (unsigned int) strlen (query[]));

   if (!flag)

     {

       res = mysql_store_result (&mysql);

       while (row = mysql_fetch_row (res))

         {

           for (r = ; r < mysql_num_fields (res); r++)

             {

               printf ("%s ", row[r]);

             }

           printf ("\n");

         }

     }

   else

     {

       printf ("query failed !\n");

       return ;

     }

   mysql_close (&mysql);

   return ;

 }

//关于makefile文件：

[gxjun@localhost demo2]$ cat adddata.mk

 .SUFFIXES: .o .c

 CC = gcc

 SRC = adddata.c

 OBJS = $(SRC: .c = .o)

 EXEC = Demo

 .PHONY: start

 start: $(OBJS)

         $(CC) -o $(EXEC) $(OBJS) -I/usr/include/mysql -L/usr/lib/mysql -lmysqlclient

 $(OBJS): $(SRC)

         $(CC) -g  -Wall $(OBJS) -c $(SRC)  -I/usr/include/mysql -L/usr/lib/mysql -lmysqlcilent

 .PHONY: clean

 clean:

         rm -f $(OBJS) core.*

//关于shell文件

[gxjun@localhost demo2]$ cat adddata.sh

 #!/bin/bash/

 echo "make is starting ....!"

 indent -gnu adddata.c

 make -f adddata.mk

 echo "make is endding ...! "

显示结果：

[gxjun@localhost demo2]$ ./Demo
connect the mysql successfully!Insert data[0] is successfully !
Insert data[1] is successfully !
Insert data[2] is successfully !
1001 jim
1002 tom
1003 gongxijun
1004 qinshihuang
[gxjun@localhost demo2]$ ls

关于数据库的插入和查询以及连接的综合案列：

[gxjun@localhost demo2]$ cat adddata.c

 #include<stdio.h>

 #include<string.h>

 #include<stdlib.h>

 #include "mysql.h"

 //#include<fcntl.h>

 int

 main (void)

 {

   MYSQL mysql;                  //var mysql

   MYSQL_RES *res;               //grep_result

   MYSQL_ROW row;                //mysql_row

   int r;                        //var_tmp  r

   char *query[];

   int flag;

   //init_mysql

   mysql_init (&mysql);

   if (!mysql_real_connect

       (&mysql, "localhost", "root", "", "demo", , NULL, ))

     {

       printf ("can't connect the mysql ! errInfo=[%s]", mysql_error (&mysql));

     }

   else

     {

       printf ("connect the mysql successfully!");

       query[] = "insert into student(sno,sname)values(1002,'tom')";

       query[] = "insert into student(sno,sname)values(1003,'gongxijun')";

       query[] = "insert into student(sno,sname)values(1004,'qinshihuang')";

 //insert data to mysql

       for (r = ; r < ; r++)

         {

           if (mysql_real_query

               (&mysql, query[r], (unsigned int) strlen (query[r])))

             {

               printf ("insert data[%d] is failed !\n", r);

               return ;

             }

           else

             {

               printf ("Insert data[%d] is successfully !\n", r);

             }

         }

     }

 //query part

   query[] = "select * from student";

   flag =

     mysql_real_query (&mysql, query[], (unsigned int) strlen (query[]));

   if (!flag)

     {

       res = mysql_store_result (&mysql);

       while (row = mysql_fetch_row (res))

         {

           for (r = ; r < mysql_num_fields (res); r++)

             {

               printf ("%s ", row[r]);

             }

           printf ("\n");

         }

     }

   else

     {

       printf ("query failed !\n");

       return ;

     }

   mysql_close (&mysql);

   return ;

 }

//关于makefile文件：

[gxjun@localhost demo2]$ cat adddata.mk

 .SUFFIXES: .o .c

 CC = gcc

 SRC = adddata.c

 OBJS = $(SRC: .c = .o)

 EXEC = Demo

 .PHONY: start

 start: $(OBJS)

         $(CC) -o $(EXEC) $(OBJS) -I/usr/include/mysql -L/usr/lib/mysql -lmysqlclient

 $(OBJS): $(SRC)

         $(CC) -g  -Wall $(OBJS) -c $(SRC)  -I/usr/include/mysql -L/usr/lib/mysql -lmysqlcilent

 .PHONY: clean

 clean:

         rm -f $(OBJS) core.*

//关于shell文件

[gxjun@localhost demo2]$ cat adddata.sh

 #!/bin/bash/

 echo "make is starting ....!"

 indent -gnu adddata.c

 make -f adddata.mk

 echo "make is endding ...! "

显示结果：

-------------------------------------华丽丽的分割线-----------------------------------------------------------

|++++++++++++++++++++++显示删除和查询功能++++++++++++++++++++++++++++++++++++|

del.c代码：

 #include<stdio.h>

 #include<string.h>

 #include "mysql.h"

 int

 main (void)

 {

   MYSQL mysql;

   MYSQL_RES *res;

   MYSQL_ROW row;

   char *query;

   int rr, flag;

   mysql_init (&mysql);          //init mysql

   MYSQL *pts = mysql_real_connect (&mysql, "localhost", "root", "", "demo", , NULL, );     //to connect the mysql

   if (pts == NULL)

     {

       printf ("connect is failed !  [%s ]\n", mysql_error (&mysql));

       return ;

     }

   printf ("conected successfully ! \n");

 //the part of function is to query the data of mysql

   query = "select * from student ";

   flag = mysql_real_query (&mysql, query, (unsigned int) strlen (query));

   if (flag)

     {

       printf ("query the mysql is failed ! [%s ] \n", mysql_error (&mysql));

       return ;

     }

   res = mysql_store_result (&mysql);    // return a point of res (var MYSQL_RES *)

   while (row = mysql_fetch_row (res))

     {                           //to next row

       for (rr = ; rr < mysql_num_fields (res); rr++)

         printf ("[ %s ] ", row[rr]);

       puts ("");

     }

   //the part of del the data  of mysql

   query = "delete from student where sname = 'gongxijun'";

   flag = mysql_real_query (&mysql, query, (unsigned int) strlen (query));

   if (flag)

     {

       printf ("sorry ,delect the data of mysql is failed !\n [%s ] ",

               mysql_error (&mysql));

       return ;

     }

   //query again

   query = "select * from student ";

   flag = mysql_real_query (&mysql, query, (unsigned int) strlen (query));

   if (flag)

     {

       printf ("query failed ! the result= [%s ] \n", mysql_error (&mysql));

       return ;

     }

   res = mysql_store_result (&mysql);

   while (row = mysql_fetch_row (res))

     {

       for (rr = ; rr < mysql_num_fields (res); rr++)

         printf ("[%s ]\n", row[rr]);

       printf ("\n");

     }

   mysql_close (&mysql);         //close mysql

   return ;

 }

关于makefile文件： del.mk

   .SUFFIXES: .o .c

 CC = gcc

 SRC = del.c

 OBJS = $(SRC: .c =.o)

 EXEC = Demo

 .PHONY: start

 start: $(OBJS)

         $(CC) -o $(EXEC) $(OBJS) -I/usr/include/mysql -L/usr/lib/mysql -lmysqlclient

 $(OBJS): $(SRC)

         $(CC) -g -Wall $(OBJS) -c  $(SRC) -I/usr/include/mysql -L/usr/lib/mysql -lmysqlclient

 .PHONY: clean

 clean:

         rm -f $(OBJS) core.*

 ~

 ~

关于bash文件：

indent -gnu del.c

make -f del.mk
显示结果：
[gxjun@localhost demo3]$ bash del.sh
bash: /root/.bashrc: 权限不够
make: Circular del.c <- del.c dependency dropped.
gcc -o Demo del.c -I/usr/include/mysql -L/usr/lib/mysql -lmysqlclient
[gxjun@localhost demo3]$ ./Demo
conected successfully !
[ 1001 ] [ jim ]
[ 1002 ] [ tom ]
[ 1003 ] [ gongxijun ]
[ 1004 ] [ qinshihuang ]
sorry ,delect the data of mysql is failed !
[You have an error in your SQL syntax near '* from student where sname =gongxijun' at line 1 ] [gxjun@localhost demo3]$ vi del.c
[gxjun@localhost demo3]$ bash del.sh
bash: /root/.bashrc: 权限不够
make: Circular del.c <- del.c dependency dropped.
gcc -o Demo del.c -I/usr/include/mysql -L/usr/lib/mysql -lmysqlclient
[gxjun@localhost demo3]$ ./Demo
conected successfully !
[ 1001 ] [ jim ]
[ 1002 ] [ tom ]
[ 1003 ] [ gongxijun ]
[ 1004 ] [ qinshihuang ]
sorry ,delect the data of mysql is failed !
[Unknown column 'gongxijun' in 'where clause' ] [gxjun@localhost demo3]$
[gxjun@localhost demo3]$
[gxjun@localhost demo3]$ vi del.c
[gxjun@localhost demo3]$ bash del.sh
bash: /root/.bashrc: 权限不够
make: Circular del.c <- del.c dependency dropped.
gcc -o Demo del.c -I/usr/include/mysql -L/usr/lib/mysql -lmysqlclient
[gxjun@localhost demo3]$ ./Demo
conected successfully !
[ 1001 ] [ jim ]
[ 1002 ] [ tom ]
[ 1003 ] [ gongxijun ]
[ 1004 ] [ qinshihuang ]
[1001 ]
[jim ]

[1002 ]
[tom ]

[1004 ]
[qinshihuang ]

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