如何将两个新列添加到Android SQLite数据库？

Question

我在Android市场上有一个应用程序,现在我想改变数据库提交.我想在特定的表中添加两个新字段.您能帮我如何向表中添加两个新列吗？

这是我的代码.

 private static final String ALTER_USER_TABLE = "ALTER TABLE user_table ADD user_society text,user_street1 text;"; 

 @Override
 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 
 {
    db.execSQL(ALTER_USER_TABLE);
 }

执行后我收到以下错误.

W/System.err(  717): android.database.sqlite.SQLiteException: near ",": syntax error: ALTER TABLE user_table ADD user_society text,user_street1 text;
W/System.err(  717):    at android.database.sqlite.SQLiteDatabase.native_execSQL(Native Method)
W/System.err(  717):    at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1727)
W/System.err(  717):    at com.kbobs.org.database.Database$DatabaseHelper.onUpgrade(Database.java:48)
W/System.err(  717):    at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:108)
W/System.err(  717):    at com.kbobs.org.database.Database.OpenDatabase(Database.java:54)
W/System.err(  717):    at com.kbobs.org.ui.Login$2.handleMessage(Login.java:222)
W/System.err(  717):    at android.os.Handler.dispatchMessage(Handler.java:99)
W/System.err(  717):    at android.os.Looper.loop(Looper.java:123)
W/System.err(  717):    at android.app.ActivityThread.main(ActivityThread.java:4627)
W/System.err(  717):    at java.lang.reflect.Method.invokeNative(Native Method)
W/System.err(  717):    at java.lang.reflect.Method.invoke(Method.java:521)
W/System.err(  717):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
W/System.err(  717):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)

Answer 1

您一次只能添加一列.将它分成两个ALTER TABLE陈述,你应该没事.

private static final String ALTER_USER_TABLE_ADD_USER_SOCIETY = 
    "ALTER TABLE user_table ADD user_society TEXT";
private static final String ALTER_USER_TABLE_ADD_USER_STREET1 = 
    "ALTER TABLE user_table ADD user_street1 TEXT";

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 
{
   db.execSQL(ALTER_USER_TABLE_ADD_USER_SOCIETY);
   db.execSQL(ALTER_USER_TABLE_ADD_USER_STREET1);
}