Question

你好我们在iphone中做一些数据库操作..请任何人解释我如何从表中检索所有行...在这个例子中它只检索最新输入的数据..

while(sqlite3_step(statement) == SQLITE_ROW)
    {   
        char *field1 = (char *) sqlite3_column_text(statement,0);
        NSString *field1Str = [[NSString alloc] initWithUTF8String: field1];
        char *field2 = (char *) sqlite3_column_text(statement,1);
        NSString *field2Str = [[NSString    alloc] initWithUTF8String: field2];

        NSString *str = [[NSString alloc] initWithFormat:@"%@::%@",field1Str, field2Str];
        textv.text=str;

        [field1Str release];
        [field2Str release];
    }

Answer 1

到目前为止，你做得很好。只需在NSMutableArray中添加最终格式化的字符串（str），最后从函数中返回它。

// Take an array to store all string.
NSMutableArray *allRows = [[[NSMutableArray alloc] init] autorelease];

while(sqlite3_step(statement) == SQLITE_ROW)
    {   
        char *field1 = (char *) sqlite3_column_text(statement,0);
        NSString *field1Str = [[NSString alloc] initWithUTF8String: field1];
        char *field2 = (char *) sqlite3_column_text(statement,1);
        NSString *field2Str = [[NSString    alloc] initWithUTF8String: field2];

        NSString *str = [NSString stringWithFormat:@"%@::%@",field1Str, field2Str];
        // textv.text=str; // I don't know why your are mixing your view controller stuff's in database function.
// Add the string in the array.
allRows addObject:str];

        [field1Str release];
        [field2Str release];
    }

// Finally you can return your allRows
return allRows;

如何从SQLite表中检索所有行？

1 个答案: