Question

我使用“通过字符串连接的组件”加入了三个对象。 joinString的NSLog给了我这个：

joined string  is (
"722.3300",
"4924.6700",
"225.38"
)

当我将其添加到数组时，它显示如下：

array objects are:

   {  
        "obj1",
        "obj2",
         "(\n    \"722.3300\",\n    \"4924.6700\",\n    \"225.38\"\n)",
         "obj4"
     }

我尝试将这些值插入到我的sqlite

中

      insertString=[NSString stringWithFormat:@"INSERT INTO MY_T (field1) VALUES (\"%@\")",[array objectatIndex:0]];    //this executes perfectly

      insertString=[NSString stringWithFormat:@"INSERT INTO MY_T (field1) VALUES (\"%@\")",[array objectatIndex:1]];     //this executes perfectly

      insertString=[NSString stringWithFormat:@"INSERT INTO MY_T (field1) VALUES (\"%@\")",[array objectatIndex:2]];    //oops...somethings wrong here

      insertString=[NSString stringWithFormat:@"INSERT INTO MY_T (field1) VALUES (\"%@\")",[array objectatIndex:3]];        //this executes perfectly

有没有其他方法可以插入连接的字符串？请帮助我解决这个问题。

Answer 1

你应该使用单引号（＆＃39;）而不是双引号（＆＃34;）来sqlite字符串。

insertString=[NSString stringWithFormat:@"INSERT INTO MY_T (field1) VALUES ('%@')",[array objectatIndex:0]];
insertString=[NSString stringWithFormat:@"INSERT INTO MY_T (field1) VALUES ('%@')",[array objectatIndex:1]];
insertString=[NSString stringWithFormat:@"INSERT INTO MY_T (field1) VALUES ('%@')",[array objectatIndex:2]];
insertString=[NSString stringWithFormat:@"INSERT INTO MY_T (field1) VALUES ('%@')",[array objectatIndex:3]];

如果您要插入的字符串包含单引号，则应使用two single quotes ('')对其进行转义。请参阅- stringByReplacingOccurrencesOfString:withString:。

insertString=[NSString stringWithFormat:@"INSERT INTO MY_T (field1) VALUES ('%@')", [[array objectatIndex:0] stringByReplacingOccurrencesOfString:@"'" withString:@"''"]];
insertString=[NSString stringWithFormat:@"INSERT INTO MY_T (field1) VALUES ('%@')", [[array objectatIndex:1] stringByReplacingOccurrencesOfString:@"'" withString:@"''"]];
insertString=[NSString stringWithFormat:@"INSERT INTO MY_T (field1) VALUES ('%@')", [[array objectatIndex:2] stringByReplacingOccurrencesOfString:@"'" withString:@"''"]];
insertString=[NSString stringWithFormat:@"INSERT INTO MY_T (field1) VALUES ('%@')", [[array objectatIndex:3] stringByReplacingOccurrencesOfString:@"'" withString:@"''"]];

无法将格式化的字符串插入sqlite

1 个答案: