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<>SQLite C接口基本函数功能介绍
<>打开关闭
sqlite3 * db = NULL;
需要传入 db 这个指针的指针,因为 sqlite3_open 函数要为这个指针分配内存,还要让db指针指向这个内存区
if (sqlite3_open( “c://Dcg_database.db”, &db ) != SQLITE_OK)
sqlite3_close( db );
<>执行sql语句 sqlite3_exec
int sqlite3_exec(sqlite3*, const char *sql, sqlite3_callback, void *, char
**errmsg )
第1个参数不再说了,是前面open函数得到的指针。说了是关键数据结构。
第2个参数const** char *sql 是一条 sql 语句,以/0结尾。
第3个参数sqlite3_callback 是回调,当这条语句执行之后,sqlite3会去调用你提供的这个函数。
第4个参数void * 是你所提供的指针,你可以传递任何一个指针参数到这里,这个参数最终会传到回调函数里面,
如果不需要传递指针给回调函数,可以填NULL。等下我们再看回调函数的写法,以及这个参数的使用。
第5个参数char ** errmsg 是错误信息。注意是指针的指针。sqlite3里面有很多固定的错误信息。
执行 sqlite3_exec 之后,执行失败时可以查阅这个指针(直接 printf(“%s/n”,errmsg))得到一串字符串信息,
这串信息告诉你错在什么地方。sqlite3_exec函数通过修改你传入的指针的指针,把你