Ios 如何从SQLite读取一列并存储在数组中

我有一个SQLite数据库，它有5列，分别命名为：

Name

，

ID

，

ChildID

，

ParentID

，

brotherrid

在这个数据库中，我有很多记录，我想在数组中存储所有列中的一个值并返回这个数组。例如，我想获取

ParentID

列中的所有值。我使用以下查询代码：

从表1中选择ParentID

（表1是表的名称）

这是我从特定列获取数组的代码：

/*==================================================================
 METHOD FOR GETTING MIDIFIED FROM DATABASE
 ==================================================================*/
- (NSMutableArray*)readingModified
{
     ModiArray = [[NSMutableArray alloc] init];
    // Setup the database object
    sqlite3 *database2;
    // Open the database from the users filessytem
    if(sqlite3_open([[self DatabaseSqlite] UTF8String], &database2) == SQLITE_OK)
    {
        // Setup the SQL Statement and compile it for faster access
        //SQLIte Statement
        NSString *sqlStatement_userInfo =[NSString stringWithFormat:@"Select ParentID from Table1"];
        sqlite3_stmt *compiledStatement;
        if(sqlite3_prepare_v2(database2, [sqlStatement_userInfo UTF8String], -1, &compiledStatement, NULL) == SQLITE_OK)
        {
            // Loop through the results and add them to the feeds array
            while(sqlite3_step(compiledStatement) == SQLITE_ROW)
            {
                // Init the Data Dictionary
                NSMutableDictionary *_dataDictionary2=[[NSMutableDictionary alloc] init];
                NSString *_recordParentID = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 0)];
                [_dataDictionary2 setObject:[NSString stringWithFormat:@"%@",_recordModified] forKey:@"ParentID"];
                [array addObject:_dataDictionary2];
            }
        }
        else
        {
            NSLog(@"No Data Found");
        }
        // Release the compiled statement from memory
        sqlite3_finalize(compiledStatement);
    }
    sqlite3_close(database2);

    return ModiArray;
}

---

请告诉我我的错误。

我的几个朋友小心点

此代码是正确的，但您犯了错误： [array addObject:_dataDictionary2]

而是

array

put

ModiArray

/*==================================================================
 METHOD FOR GETTING MIDIFIED FROM DATABASE
 ==================================================================*/
- (NSMutableArray*)readingModified
{
     ModiArray = [[NSMutableArray alloc] init];
    // Setup the database object
    sqlite3 *database2;
    // Open the database from the users filessytem
    if(sqlite3_open([[self DatabaseSqlite] UTF8String], &database2) == SQLITE_OK)
    {
        // Setup the SQL Statement and compile it for faster access
        //SQLIte Statement
        NSString *sqlStatement_userInfo =[NSString stringWithFormat:@"Select ParentID from Table1"];
        sqlite3_stmt *compiledStatement;
        if(sqlite3_prepare_v2(database2, [sqlStatement_userInfo UTF8String], -1, &compiledStatement, NULL) == SQLITE_OK)
        {
            // Loop through the results and add them to the feeds array
            while(sqlite3_step(compiledStatement) == SQLITE_ROW)
            {
                // Init the Data Dictionary
                NSMutableDictionary *_dataDictionary2=[[NSMutableDictionary alloc] init];
                NSString *_recordParentID = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 0)];
                [_dataDictionary2 setObject:[NSString stringWithFormat:@"%@",_recordModified] forKey:@"ParentID"];
                [ModiArray addObject:_dataDictionary2];
            }
        }
        else
        {
            NSLog(@"No Data Found");
        }
        // Release the compiled statement from memory
        sqlite3_finalize(compiledStatement);
    }
    sqlite3_close(database2);

    return ModiArray;
}

---

您正在将对象添加到

数组

，并分配和返回

修改数组