[c/c++] c 操作mysql数据库

1 #include <my_global.h>
2 #include <mysql.h>
3 #include <stdlib.h>
4 #include <stdio.h>
5
6 int main(int argc,char **argv) {
7     printf("mysql client version:%s\n",mysql_get_client_info());
8     return 0;
9 }

gcc version.c -o version $(mysql_config --cflags --libs)

$ ./version
mysql client version:5.1.63

 1 #include <my_global.h>
 2 #include <mysql.h>
 3 #include <stdio.h>
 4 #include <stdlib.h>
 5
 6 int main(int argc,char **argv) {
 7     MYSQL *conn;
 8
 9     conn = mysql_init(NULL);
10     if(conn == NULL) {
11         printf("Error %u:%s\n",mysql_errno(conn),mysql_error(conn));
12         exit(EXIT_FAILURE);
13     }
14
15     // host user password 
16     if(mysql_real_connect(conn,"localhost","root","admin",NULL,0,NULL,0) == NULL) {
17         printf("Error %u:%s\n",mysql_errno(conn),mysql_error(conn));
18         exit(EXIT_FAILURE);
19     }
20
21     char* sql = "CREATE DATABASE IF NOT EXISTS test_cdb";
22     //char* sql = "CREATE database test_cdb";
23     if(mysql_query(conn,sql)) {
24         printf("Error %u:%s\n",mysql_errno(conn),mysql_error(conn));
25         exit(EXIT_FAILURE);
26     }
27
28     mysql_close(conn);
29
30     exit(EXIT_SUCCESS);
31 }

 1 #include <my_global.h>
 2 #include <mysql.h>
 3 #include <stdio.h>
 4 #include <stdlib.h>
 5
 6 int main(int argc,char **argv) {
 7     MYSQL *conn;
 8
 9     conn = mysql_init(NULL);
10     // host user password dbname
11     if(mysql_real_connect(conn,"localhost","root","admin","test_cdb",0,NULL,0) == NULL) {
12         printf("Error %u:%s",mysql_errno(conn),mysql_error(conn));
13         exit(EXIT_FAILURE);
14     }
15
16     char* sql = "CREATE TABLE IF NOT EXISTS test(name VARCHAR(25));";
17     if(mysql_query(conn,sql)) {
18         printf("Error %u:%s",mysql_errno(conn),mysql_error(conn));
19         exit(EXIT_FAILURE);
20     }
21     sql = "INSERT INTO test VALUES('test1')";
22     if(mysql_query(conn,sql)) {
23         printf("Error %u:%s",mysql_errno(conn),mysql_error(conn));
24         exit(EXIT_FAILURE);
25     }
26
27     mysql_close(conn);
28     exit(EXIT_SUCCESS);
29 }

 1 #include <my_global.h>
 2 #include <mysql.h>
 3 #include <stdio.h>
 4 #include <stdlib.h>
 5
 6 int main(int argc,char **argv) {
 7     MYSQL *conn;
 8     MYSQL_RES *result;
 9     MYSQL_ROW row;
10     MYSQL_FIELD *field;
11
12     int num_fields;
13     int i;
14     int j = 0;
15
16     conn = mysql_init(NULL);
17     if(mysql_real_connect(conn,"localhost","root","admin","test_cdb",0,NULL,0) == NULL) {
18         printf("Error %u:%s",mysql_errno(conn),mysql_error(conn));
19         exit(EXIT_FAILURE);
20     }
21
22     char* sql = "SELECT * FROM test";
23     if(mysql_query(conn,sql)) {
24         printf("Error %u:%s",mysql_errno(conn),mysql_error(conn));
25         exit(EXIT_FAILURE);
26     }
27     result = mysql_store_result(conn);
28     num_fields = mysql_num_fields(result); // 记录项数
29
30     while((row = mysql_fetch_row(result))) {
31         // for(int i = 0; i < num_fields;i++) { // allowed c99 mode
32         for(i = 0; i < num_fields;i++) {
33             if(j == 0) {
34                 // struct ?
35                 while(field = mysql_fetch_field(result)) {
36                     printf("%s ",field->name);
37                 }
38                 printf("\n");
39             }
40             printf("%s ",row[i]? row[i] : "NULL");
41         }
42         printf("\n");
43         j++;
44     }
45     mysql_free_result(result);
46
47     mysql_close(conn);
48     exit(EXIT_SUCCESS);
49 }