SQLiteÓëC½áºÏ
SQLite¹Ù·½ÍøÕ¾Àý×Ó£º
#include <stdio.h>
#include <sqlite3.h>
static int callback(void *NotUsed, int argc, char **argv, char **azColName){
int i;
for(i=0; i<argc; i++){
printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
}
printf("\n");
return 0;
}
int main(int argc, char **argv){
sqlite3 *db;
char *zErrMsg = 0;
int rc;
if( argc!=3 ){
fprintf(stderr, "Usage: %s DATABASE SQL-STATEMENT\n", argv[0]);
exit(1);
}
rc = sqlite3_open(argv[1], &db);
if( rc ){
fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
sqlite3_close(db);
exit(1);
}
rc = sqlite3_exec(db, argv[2], callback, 0, &zErrMsg);
if( rc!=SQLITE_OK ){
fprintf(stderr, "SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
}
sqlite3_close(db);
return 0;
}
ÓÃgcc±àÒë
gcc -lsqlite3 sqlite.c -o sqlite
ÔËÐÐʱ./sqlite ab.db 'SQL Óï¾ä'
Ïà¹ØÎĵµ£º
CÖеĿɱä²ÎÊýÑо¿
Ò»£® ºÎν¿É±ä²ÎÊý
int
printf( const char* format, ...);
ÕâÊÇʹÓùýCÓïÑÔµÄÈËËùÔÙÊìϤ²»¹ýµÄprintfº¯ÊýÔÐÍ£¬ËüµÄ²ÎÊýÖÐ
¾ÍÓй̶¨²ÎÊýformatºÍ¿É±ä²ÎÊý£¨ÓÔ…”±íʾ£©. ¶øÎÒÃÇÓÖ¿ÉÒÔÓø÷ÖÖ·½Ê½À´µ÷ÓÃprintf,Èç:
printf("%d",value);
printf("%s",s ......
ÎÄÕÂ×÷ÕߣºSlyar
ÏÈ¿´Á½¸ö´úÂ룬µÚÒ»¸öÊÇC³ÌÐò£¬µÚ¶þ¸öÊÇC++³ÌÐò£¬³ýÁËÍ·Îļþ²»Í¬ÒÔÍâÆäËûµÄ¶¼Ò»Ñù¡£
//demo.c
#include <stdio.h>
int foo();
int main()
{
int a;
foo(a);
return 0;
}
int foo(int a)
{
}//demo.cpp
#include <iostream>
int foo();
int main()
{
in ......
³£¼ûµÄÄÚ´æ·ÖÅäºÍʹÓôíÎó
1) ÄÚ´æµÄÉêÇëºÍ·ÖÅ䲢ûÓгɹ¦£¬µ«³ÌÐòԱȴʹÓÃÁËËü¡£Ò»Ð©ÐÂÊÖ¾³£»á·¸ÕâÖÖ´íÎó£¬ËûÃDz¢²»»áÁôÒâµ½ÄÚ´æÃ»ÓзÖÅä³É¹¦¡£ÅжÏÖ¸ÕëµÄÖµÊÇ·ñΪNULL¿ÉÒÔÓÐЧµØ±ÜÃâÕâÖÖ´íÎó¡£
2) ÄÚ´æµÄ·ÖÅäÒѾ³É¹¦£¬µ«ÊÇȴûÓнøÐгõʼ»¯¾ÍÖ±½ÓʹÓÃËüÁË¡£Ê×ÏÈÊ ......
1. ³õʼ»¯Ò»¸öÁ¬½Ó¾ä±ú
MYSQL *mysql_init(MYSQL *);
ÕýÈ·£º·µ»ØÒ»¸öÖ¸ÏòзÖÅäµÄÁ´½Ó¾ä±ú½á¹¹µÄÖ¸Õë
´íÎó£ºNULL
×¢£º¸Ãº¯ÊýµÄ´«Èë²ÎÊýͨ³£ÎªNULL¼´¿É¡£
2. ½¨Á¢ÎïÀíÁ¬½Ó
MYSQL *mysql_real_connect(MYSQL *connect ......