Delete SQLite Row with where clause with multiple clauses

Question

I\'ve been searching around and not managed to find a solution or working example so here goes.

I\'ve set up an SQLite database which has five columns with different fie

Answer 1

I have a feeling that KEY_DATE, KEY_GRADE, etc are you Java variable names not your actual column names. Try changing your code to this:

.delete(DATABASE_TABLE,
        KEY_DATE + "='date' AND " + KEY_GRADE + "='style2' AND " +
        KEY_STYLE + "='style' AND " + KEY_PUMPLEVEL + "='pumpLevel'",
        null);

Also I assume that 'date', 'style', etc are stored in local variables, you should use the whereArgs parameter to project yourself from SQL Injection Attacks:

.delete(DATABASE_TABLE,
        KEY_DATE + "=? AND " + KEY_GRADE + "=? AND " +
        KEY_STYLE + "=? AND " + KEY_PUMPLEVEL + "=?",
        new String[] {date, grade, style, pumpLevel});

(where date = "date", grade = "style2", etc)

---

Added from comments

To delete the last row use this:

.delete(DATABASE_TABLE,
        "ROWID = (SELECT Max(ROWID) FROM " + DATABASE_TABLE + ")",
        null);

---

To delete your last matching row try this:

.delete(DATABASE_TABLE,
        "ROWID = (SELECT Max(ROWID) FROM " + DATABASE_TABLE + " WHERE " +
            "KEY_DATE='date' AND KEY_GRADE='style2' AND " +
            "KEY_STYLE='style' AND KEY_PUMPLEVEL='pumpLevel')",
        null);

But see my second note about SQL Injection Attacks to protect your data.

Answer 2

You should use:

Database.delete(DATABASE_TABLE,
                "KEY_DATE=? AND KEY_GRADE = ? AND KEY_STYLE = ? AND KEY_PUMPLEVEL = ?",
                 new String[]{"date", "style2", "style", "pumpLevel"});

which simplifies escaping values.