SQLite数据库使用总结

1.在SQLite中插入当前时间,变量定义不用多说
char *sql = sqlite3_mprintf("insert into Log VALUES(datetime('now', 'localtime'), '%q', '%q')", cUser, cLogContent);
int ret = sqlite3_exec(Sqlite3, sql, NULL, NULL, &pErrMsg);
以月份为单位统计出符合当前月份的记录, Time为数据库中字段名:
char *sql = sqlite3_mprintf("select * from Log where Time>=datetime('now','start of month') order by Time DESC");
sqlite3_prepare(sqlite3_db, sql, -1, &pStmt, &pzTail);
int ret = sqlite3_step(pStmt);
while (ret == SQLITE_ROW)
{
    ...
    ret = sqlite3_step(pStmt);
}
以时间段来查询,界面提示的时间为YYYY-MM-DD格式,cStartTime, cEndTime为char *储存的是时间YYYY-MM-DD:
char *sql = sqlite3_mprintf("select * from Log where Time between datetime('%q','start of day') and datetime('%q','start of
day','+1 day') order by Time DESC", cStartTime, cEndTime);
sqlite3_prepare(sqlite3_db, sql, -1, &pStmt, &pzTail);
int ret = sqlite3_step(pStmt);
while (ret == SQLITE_ROW)
{
    ...
    ret = sqlite3_step(pStmt);
}
2.注意:切记在错误处理中,也要把打开的数据库关闭,不然带来不必要的麻烦
3.大量数据处理是,用事务,事半功倍
4.用sqlite3_open16(L"data.db", &m_sqlite3);打开数据库时,必须加上L