Question

上一个问题：我正在关注SQLite教程，现在我想再向表中添加两列，但现在有错误吗？这里有什么问题？请帮忙。

logcat的：

   08-10 15:13:29.077: E/SQLiteLog(17055): (1) table country has no column named add
08-10 15:13:29.082: E/SQLiteDatabase(17055): Error inserting add=Feg dest=Fhd code=5495 cap=Egd name=A
08-10 15:13:29.082: E/SQLiteDatabase(17055): android.database.sqlite.SQLiteException: table country has no column named add (code 1): , while compiling: INSERT INTO country(add,dest,code,cap,name) VALUES (?,?,?,?,?)
08-10 15:13:29.082: E/SQLiteDatabase(17055):    at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
08-10 15:13:29.082: E/SQLiteDatabase(17055):    at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:1012)

我的SQLite java类

@Override
    public void onCreate(SQLiteDatabase db) {
        String createQuery = "CREATE TABLE country (_id integer primary key autoincrement,name, cap, code, dest, add);";     
        db.execSQL(createQuery);        
    }

Answer 1

请更改此

 db.execSQL("CREATE TABLE if not exists countryname(id INTEGER PRIMARY KEY AUTOINCREMENT,"
            + " name"
            + " TEXT ,"
            + " cape"
            + " TEXT,"
            + " code" 
            + " TEXT,"
            + " dest" 
            + " TEXT,"
            + " mem"
            +" TEXT);");

到

  db.execSQL("CREATE TABLE if not exists countryname(id INTEGER PRIMARY KEY AUTOINCREMENT,"
            + " name"
            + " TEXT ,"
            + " cape"
            + " TEXT,"
            + " code" 
            + " TEXT,"
            + " dest" 
            + " TEXT,"
            + " mem"
            +" TEXT)");

你在TEXT之后有; ..然后请删除你的旧数据库并再次尝试它确实有效。

Answer 2

您不能使用任何保留关键字作为列名。 add是一个保留关键字，它不能用作列名，除非你引用它像'add'，“add”，add或将它包装在像[add]这样的括号中。

Answer 3

可能是因为“添加”是SQLite reserved word。您需要引用它，以表明它是列名。

INSERT INTO country(dest,code,[add],cap,name)

在链接中，您实际上可以使用“添加”，“添加”，[添加]或add中的任何一种。

SQLite无法插入表

3 个答案: