How to Update a Specific Row in Android's SQLite Database Using the `update()` Method?

Update specific row in Android's SQLite database

As you mentioned in your question, there are two main ways to update a specific row in SQLite: execSQL() and update(). Let’s clarify the syntax of the update() method:

update(String table, ContentValues values, String whereClause, String[] whereArgs)

• table: The name of the table to be updated.
• values: A ContentValues object containing the value to be updated.
• whereClause: A SQL WHERE clause that specifies the conditions for updating.
• whereArgs: A string array containing the parameters of the WHERE clause.

The error you are getting appears to be because no ContentValues object was created to specify the value to be updated. You should first create a ContentValues object, fill it with the required values ​​using the put method, and then use it within the update() method.

For example, if you have a table named "ExampleTable" with the following columns:

• Field1 (text)
• Field2 (integer)
• Field3 (text)

To update the first row to "Bob", 19, and "Male" you can do the following:

ContentValues cv = new ContentValues();
cv.put("Field1", "Bob");
cv.put("Field2", 19);
cv.put("Field3", "Male");

myDB.update("ExampleTable", cv, "_id = ?", new String[]{"1"});

This will update the first row with the _id field equal to "1" with the specified value.

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