Question

I have a couple of columns in my database which has been annotated as uniqueCombo=true

@DatabaseField(columnName = "COL1", uniqueCombo = true)
private Double col1;

@DatabaseField(columnName = "COL2", uniqueCombo = true)
private Double col2;

According to ormlite documentation the combination of these two fields should be unique in the table. To test this I am purposely adding same fields. I do get the SQLException but am not sure how do I handle this exception and ask the user to make changes.

try {
        mydao.create(myInfo);

     } catch (SQLException e) {
        // TODO Auto-generated catch block

       e.printStackTrace();
       /* Need to uniquely identify constraint failed error here
        * and ask user to make suitable change */
     }

Any idea how this can be accomplished.

— UPDATE —

SQLException getErrorCode and getSQLState both return 0 and null respectively.

Logcat StackTrace:

Caused by: android.database.sqlite.SQLiteConstraintException: column NAME is not unique (code 19)
01-31 22:15:14.042: W/System.err(2586):         at android.database.sqlite.SQLiteConnection.nativeExecuteForLastInsertedRowId(Native Method)
01-31 22:15:14.042: W/System.err(2586):         at android.database.sqlite.SQLiteConnection.executeForLastInsertedRowId(SQLiteConnection.java:775)
01-31 22:15:14.042: W/System.err(2586):         at android.database.sqlite.SQLiteSession.executeForLastInsertedRowId(SQLiteSession.java:788)
01-31 22:15:14.042: W/System.err(2586):         at android.database.sqlite.SQLiteStatement.executeInsert(SQLiteStatement.java:86)
01-31 22:15:14.042: W/System.err(2586):         at com.j256.ormlite.android.AndroidDatabaseConnection.insert(AndroidDatabaseConnection.java:122)
01-31 22:15:14.042: W/System.err(2586):         ... 15 more

Answer 1

I do get the SQLException but am not sure how do I handle this exception and ask the user to make changes.

You can certainly catch the exception and see if it is instanceof SQLiteConstraintException but I always hate treating exceptions as common occurrences.

What I would do is do a query on the user’s input to see if there is an existing MyInfo object with the same fields. Something like the following:

QueryBuilder<MyInfo, Integer> qb = mydao.queryBuilder();
qb.where().eq("COL1", myInfo.col1).and().eq("COL2", myInfo.col2);
if (qb.queryForFirst() != null) {
   // tell the user to enter unique values
}