У чому різниця між методами Execute executeUpdate executeQuery?

What is the difference between executeQuery and executenonquery?

Execute Query is used to retrieve data from a database, returning the data in the form of a DataTable. Execute Non Query is used to perform database operations like insert, update, or delete, and does not return any data.

What is the purpose of the executeUpdate() method?

executeUpdate. Executes the given SQL statement, which may be an INSERT , UPDATE , or DELETE statement or an SQL statement that returns nothing, such as an SQL DDL statement.

What does an executeQuery do?

executeQuery() was designed to execute query statements so it returns a ResultSet that contains the data returned by the query.

What is the difference between a query and an update method?

Queries take the form of a command language that lets you select, insert, update, find out the location of data, and so forth. There is also a programming interface. The UPDATE query is used to update existing records in a table. The SELECT query is used to select data from a database.

The two methods are entirely equivalent, the only meaningful difference being that executeUpdate() is part of the Java java.sql.Statement interface.
The rule of the thumb for clarity is that if you know your statement will return results, use executeQuery(), if you know it wont, use executeUpdate(), if you …
We can execute a SQL query in two different approaches by using PreparedStatement and Statement. These two interfaces are available in java.sql package.