Question

我创建了一个包含少量字段的表作为UNIQUE。因此，我必须在用户将重复的foldername插入表格时向用户显示警告。任何人都可以告诉我＆＃34;如何检查现有数据，然后才能将其插入sqlite数据库的表格中＃34;

Answer 1

您可以通过以下代码检查记录

-(BOOL)CheckForRecord:(NSString *)Name
{
    BOOL isRecordPresent=false;

    const char *dbpath = [databasePath UTF8String];
    sqlite3_stmt    *statement;

    if (sqlite3_open(dbpath, &database) == SQLITE_OK)
    {
        NSString *querySQL = [NSString stringWithFormat:
                              @"SELECT ID FROM TBL_Name WHERE Column_Name=\"%@\"",Name];

        const char *query_stmt = [querySQL UTF8String];

        if (sqlite3_prepare_v2(database,
                               query_stmt, -1, &statement, NULL) == SQLITE_OK)
        {
            if(sqlite3_step(statement) == SQLITE_ROW)
            {
                isRecordPresent = 1;
            }
            else
            {
                isRecordPresent = 0;
            }
        }
    }

    sqlite3_finalize(statement);
    if(sqlite3_close(database) == SQLITE_OK)
    {

    }
    else
    {
        NSAssert1(0, @"Error: failed to close database on memwarning with message '%s'.", sqlite3_errmsg(database));
    }   
    return isRecordPresent;
}

如何在sqlite iOS中查找现有文件夹名称

1 个答案: