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MySQL中的C API

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2016-06-07 15:52:321339browse

#include my_global.h#include mysql.hint main(int argc, char **argv){ MYSQL *conn; MYSQL_RES *result; MYSQL_ROW row; int num_fields; int i; conn = mysql_init(NULL); mysql_real_connect(conn, localhost, user, passwd, test, 0, NULL, 0); mysql_

#include <my_global.h>
#include <mysql.h>
int main(int argc, char **argv)
{
  MYSQL *conn;
  MYSQL_RES *result;
  MYSQL_ROW row;
  int num_fields;
  int i;

  conn = mysql_init(NULL);
  mysql_real_connect(conn, "localhost", "user", "passwd", "test", 0, NULL, 0);
  mysql_query(conn, "select * from student");
  result = mysql_store_result(conn);
  num_fields = mysql_num_fields(result);
  while ((row = mysql_fetch_row(result)))
  {
      for(i = 0; i <br>
注释:
<p>MYSQL* conn;</p>
conn = mysql_init(NULL);<br>
初始化一个MYSQL结构体,这个结构体就是一个数据库连接句柄。<br>
<p><br>
</p>
<p>mysql_real_connect(conn, "localhost", "user", '"passwd", "test", 0, NULL, 0) ;<br>
</p>
<p>建立一个到mysql数据库的链接。函数参数 链接句柄、主机名、用户、密码、数据库名、端口、unix套接字和客户端标志。<br>
</p>
<p><br>
</p>
<p>mysql_query(conn, "create database testdb");</p>
<p>mysql_query执行指定为“以Null终结的字符串”的SQL查询。<br>
</p>
<p><br>
</p>
<p>MYSQL_RES *result;<br>
</p>
<p>result = mysql_store_result(conn);<br>
</p>
<p>检索完整的结果集至客户端。<br>
</p>
<p><br>
</p>
<p>MYSQL_ROW row;</p>
<p>row = mysql_fetch_row(result)<br>
</p>
<p>获取结果集中的一行</p>
<p> </p>
<p>mysql_num_fields(result);<br>
</p>
<p>返回结果集中的列数</p>
<p><br>
</p>
<p>for(i = 0; i 
</p>
<p>printf("%s ", row[i] ? row[i] : "NULL");</p>
<p>}<br>
</p>
<p>输出一行数据</p>
<p><br>
</p>
<p>mysql_close(conn);<br>
<br>
关闭数据库链接。<br>
</p>
<p><br>
</p>
<p>printf("Error %u: %s\n", mysql_errno(conn), mysql_error(conn));<br>
</p>
<p>错误处理。mysql_errno返回上次调用的MySQL函数的错误编号。</p>
<p>mysql_error返回上次调用的MySQL函数的错误消息。</p>
<p><br>
</p>
<p>除非作了其他规定,返回指针的函数将返回非Null值,以指明成功,或返回NULL值以指明出错。</p>
<p>返回整数的函数将返回0以指明成功,或返回非0值以指明出错。注意,非0值仅表明这点。</p>
<p>除非在函数描述中作了其他说明,不要对非0值进行测试:<br>
if (result)                   /* correct */<br>
    ... error ...</p>
<p><br>
if (result 
    ... error ...<br>
 <br>
if (result == -1)             /* incorrect */<br>
</p>
<p><br>
</p>
<p><br>
</p>


</mysql.h></my_global.h>
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