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);
//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 ;
}
.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)
//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 ;
}
.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)
indent -gnu query.c
echo "make is running ....!"
make -f query.mk
echo "make is stopping ....! "
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
mysql> select * from student
-> ;
+------+-------+
| sno | sname |
+------+-------+
| 1001 | jim |
+------+-------+
1 row in set (0.05 sec)
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：
#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 ;
}
.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 $(OBJS) core.*
#!/bin/bash/ echo "make is starting ....!"
indent -gnu adddata.c make -f adddata.mk
echo "make is endding ...! "
connect the mysql successfully!Insert data[0] is successfully !
Insert data[1] is successfully !
Insert data[2] is successfully !
1001 jim
1002 tom
1003 gongxijun
1004 qinshihuang
[gxjun@localhost demo2]$ ls
#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 ;
}
.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 $(OBJS) core.*
#!/bin/bash/ echo "make is starting ....!"
indent -gnu adddata.c make -f adddata.mk
echo "make is endding ...! "
connect the mysql successfully!Insert data[0] is successfully !
Insert data[1] is successfully !
Insert data[2] is successfully !
1001 jim
1002 tom
1003 gongxijun
1004 qinshihuang
[gxjun@localhost demo2]$ ls
-------------------------------------华丽丽的分割线-----------------------------------------------------------
|++++++++++++++++++++++显示删除和查询功能++++++++++++++++++++++++++++++++++++|
#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 ;
}
.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 $(OBJS) core.* ~
~
make -f del.mk
显示结果：
[gxjun@localhost demo3]$ 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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