How to Correctly Update a Specific Row in an Android SQLite Database?

Android SQLite database specific row update method

There are two main ways to update a specific row in an Android SQLite database: using the execSQL method or the update method. The execSQL method allows the execution of arbitrary SQL statements, but for simple update operations, the update method is more convenient.

The update method requires four parameters: table name, value to be updated, update conditions, and parameters of the update conditions. For example, suppose you want to update the values ​​of the Field1, Field2, and Field3 fields in the row in the TableName table where the primary key _id equals 1.

Code you provided:

<code>myDB.update(TableName, "(Field1, Field2, Field3)" + " VALUES ('Bob', 19, 'Male')", "where _id = 1", null);</code>

The error is that the ContentValues ​​object is not in the correct format. To create a ContentValues ​​object, use the following syntax:

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

After creating the ContentValues ​​object, you can use it in the update method like this:

<code>myDB.update(TableName, cv, "_id = ?", new String[]{id});</code>

Here, id is the value of the primary key _id of the row to be updated. This updated code will successfully execute the update query and modify the specified row in the SQLite database.

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