如何清除错误“[NSString stringWithUTF8String：]：NULL cString'&quot ;? [英] how to remove error "[NSString stringWithUTF8String:]: NULL cString' "?

问题描述

我正在建立 sqlite3 test3.sql 数据库，
将表格设为

I am making an sqlite3 test3.sql database, making table as

CREATE TABLE rest (name VARCHAR(100), price VARCHAR(100));

表已成功创建，但现在当我使用方法插入和检索数据时， ,,,

table is successfully created but now when I am using a method for inserting and retrieving data, then getting error,,,

错误在线

NSString *str = [NSString stringWithUTF8String:
                 (char *)sqlite3_column_text(compiledStatement, 1)];

错误是 + [NSString stringWithUTF8String：]：NULL cString' code>

the error is +[NSString stringWithUTF8String:]: NULL cString'

这个错误是什么，我该如何移除？

What is this error, how can I remove it?

推荐答案

而不是只有

... = [NSString stringWithUTF8String:
       (char *)sqlite3_column_text(compiledStatement, 15)]

您要使用

... = ((char *)sqlite3_column_text(compiledStatement, 15)) ? 
      [NSString stringWithUTF8String:
       (char *)sqlite3_column_text(compiledStatement, 15)] : nil;

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