在 sqlite 中填充数组

发布于 2024-10-30 18:24:43 字数 886 浏览 2 评论 0原文

我正在做一些根本性的错误，但我正在网上寻找更好的例子，并且

在 .h 中遇到了不足:-( @interface MyDataViewController : UIViewController {

NSArray *array;
}
@property (nonatomic, retain) NSArray *array;

in m

@synthesize array;

成功的 dbretrieval:

while (sqlite3_step(statement) == SQLITE_ROW) {
            //I guess this one is wrong but I cant figure it out.. (tired?)
            array = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)];

//testoutput to textfield:
            //myName.text  = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)];
//testoutput to nslog:
            NSLog(@"Data: %@",[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)]);

        }

从 sqlitequeryn 输出最后一个：

NSLog(@"%@", array);

原文

I am doing something fundamental wrong but I am searching for better examples on the net and is coming up short :-(

in .h
@interface MyDataViewController : UIViewController {

NSArray *array;
}
@property (nonatomic, retain) NSArray *array;

in m

@synthesize array;

succesful dbretrieval:

while (sqlite3_step(statement) == SQLITE_ROW) {
            //I guess this one is wrong but I cant figure it out.. (tired?)
            array = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)];

//testoutput to textfield:
            //myName.text  = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)];
//testoutput to nslog:
            NSLog(@"Data: %@",[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)]);

        }

Outputs the last from sqlitequeryn:

NSLog(@"%@", array);

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戏舞 2024-11-06 18:24:43

您的产出是什么？您对此有何期望？您直接将 NSString 放入 NSArray 中，对于静态 NSArray 可能会或可能不会多次执行此操作。

如果您打算将多个字符串放入数组中，则应该有一个 NSMutableArray 并在每次循环 while 时简单地 addObject ：

NSMutableArray *array = [[NSMutableArray alloc] init];
...code....
while (sqlite3_step(statement) == SQLITE_ROW) {
    [array addObject:[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)]];
}

What are your output and what do you expect from this? You are directly putting a NSString into a NSArray, of which might, or might not be done several times for a static NSArray.

If you are planning on putting several strings into your array, you should have a NSMutableArray and simply addObject every time you loop through your while:

NSMutableArray *array = [[NSMutableArray alloc] init];
...code....
while (sqlite3_step(statement) == SQLITE_ROW) {
    [array addObject:[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)]];
}

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