Question

我有一个奇怪的问题，我希望能解决：

这是我的代码：

-(Shot*) getShot:(int)shot {
    NSString *sqlStr = [NSString stringWithFormat:@"SELECT * FROM tbShots where nShot = %d ", shot];
    NSArray *searchPaths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
    NSString *documentFolderPath = [searchPaths objectAtIndex:0];
    NSString *dbFilePath = [documentFolderPath stringByAppendingPathComponent:DATABASE_NAME_EXT];

    if (dbFilePath == NULL) {
        NSLog(@"dbFilePath is NULL");
    }

    sqlite3 *dbHandle;
    if (sqlite3_open([dbFilePath UTF8String], &dbHandle)) {
        NSLog(@"sqlite3_open: failed");
    }

    sqlite3_stmt *preparedStatement;
    const char* queryStatement = [sqlStr UTF8String];
    sqlite3_prepare_v2(dbHandle, queryStatement, -1, &preparedStatement, NULL);

    Shot *s = nil;
    NSString * note = @"";
    while( sqlite3_step(preparedStatement) == SQLITE_ROW)
    {
        s = [[[Shot alloc] initWithShot:shot] autorelease];
    }

    sqlite3_finalize(preparedStatement);
    sqlite3_close(dbHandle);    
    return s;
}

现在似乎工作正常：但我有一个问题：

我多次调用此功能，当我第50次调用它时，sqlite3_open函数失败（我看到日志错误'sqlite3_open：failed'...

我犯了一些错误？提前谢谢

Answer 1

我遇到了同样的问题 - 要解决此问题，您必须在应用启动时打开数据库，并在用户离开应用时关闭数据库。你不应该打开和关闭每个查询的数据库!!!!

Answer 2

嗨@ghiboz我曾经有同样的问题试试这个，我解决了我的问题：）

- (NSMutableArray *) SELECT_LANES_IN_POSITIONS:(NSString *)lanes{

sqlite3 *db;

const char *path = [[self getDBPathiPhone] UTF8String];

int v_Open = sqlite3_open(path, &db);

if(v_Open == SQLITE_OK){

    NSString *sqlS = [NSString stringWithFormat:@"THE SQL STATEMENT" , Some];

    const char *sql = [sqlS cStringUsingEncoding:NSUTF8StringEncoding];

    sqlite3_stmt *stmt;

    int v_prepare = sqlite3_prepare_v2(db, sql, -1, &stmt, NULL);

    if(v_prepare == SQLITE_OK){

        while ((sqlite3_step(stmt)) == SQLITE_ROW) {

        } 

    }else{

        NSLog(@"FAIL :: SELECT :: %i", v_prepare);

    }

    sqlite3_reset(stmt);
    sqlite3_finalize(stmt);

}else{

    NSLog(@"FAIL :: OPEN :: %i", v_Open);
}

sqlite3_close(db);

return nil;


}

ios sqlite3_open在第50次调用时失败

2 个答案: