sqlite3_close 返回 SQLITE_BUSY 的解决方案

本文介绍了一个关闭SQLite数据库连接的方法,通过循环处理SQLite_BUSY错误来确保所有事务和准备语句正确结束,最终安全关闭数据库。
void CSQLiteDB::Close()
{
    if(m_db)
    {
        sqlite3 *db = m_db;
        m_db = NULL;
        int rc = sqlite3_close(db);

        while( rc == SQLITE_BUSY)
        {
            // set rc to something that will exit the while loop
            rc = SQLITE_OK;
            sqlite3_stmt * stmt = sqlite3_next_stmt(db, NULL);

            if(stmt != NULL)
            {
                rc = sqlite3_finalize(stmt);
                if(rc == SQLITE_OK)
                {
                    rc = sqlite3_close(db);
                }
            }
        }
    }
}

/* ** Close an existing SQLite database */ static int sqlite3Close(sqlite3 *db, int forceZombie){ if( !db ){ /* EVIDENCE-OF: R-63257-11740 Calling sqlite3_close() or ** sqlite3_close_v2() with a NULL pointer argument is a harmless no-op. */ return SQLITE_OK; } if( !sqlite3SafetyCheckSickOrOk(db) ){ return SQLITE_MISUSE_BKPT; } sqlite3_mutex_enter(db->mutex); if( db->mTrace & SQLITE_TRACE_CLOSE ){ db->xTrace(SQLITE_TRACE_CLOSE, db->pTraceArg, db, 0); } /* Force xDisconnect calls on all virtual tables */ disconnectAllVtab(db); /* If a transaction is open, the disconnectAllVtab() call above ** will not have called the xDisconnect() method on any virtual ** tables in the db->aVTrans[] array. The following sqlite3VtabRollback() ** call will do so. We need to do this before the check for active ** SQL statements below, as the v-table implementation may be storing ** some prepared statements internally. */ sqlite3VtabRollback(db); /* Legacy behavior (sqlite3_close() behavior) is to return ** SQLITE_BUSY if the connection can not be closed immediately. */ if( !forceZombie && connectionIsBusy(db) ){ sqlite3ErrorWithMsg(db, SQLITE_BUSY, "unable to close due to unfinalized " "statements or unfinished backups"); sqlite3_mutex_leave(db->mutex); return SQLITE_BUSY; } #ifdef SQLITE_ENABLE_SQLLOG if( sqlite3GlobalConfig.xSqllog ){ /* Closing the handle. Fourth parameter is passed the value 2. */ sqlite3GlobalConfig.xSqllog(sqlite3GlobalConfig.pSqllogArg, db, 0, 2); } #endif /* Convert the connection into a zombie and then close it. */ db->magic = SQLITE_MAGIC_ZOMBIE; sqlite3LeaveMutexAndCloseZombie(db); return SQLITE_OK; }解释这段代码
09-19
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