What Is The Return Type Of ExecuteQuery ()?

What is the difference between executeQuery () and executeUpdate ()?

executeQuery method execute statements that returns a result set by fetching some data from the database.

It executes only select statements.

executeUpdate method execute sql statements that insert/update/delete data at the database..

What does executeQuery return?

executeQuery : Returns one ResultSet object. executeUpdate : Returns an integer representing the number of rows affected by the SQL statement. Use this method if you are using INSERT , DELETE , or UPDATE SQL statements.

What does executeUpdate return in JDBC?

int executeUpdate(String SQL): Returns the number of rows affected by the execution of the SQL statement. Use this method to execute SQL statements, for which you expect to get a number of rows affected – for example, an INSERT, UPDATE, or DELETE statement.

Can we use ExecuteQuery for update?

sql. SQLException with message “executeQuery method can not be used for update”. Statement executeUpdate(String query) is used to execute Insert/Update/Delete (DML) statements or DDL statements that returns nothing. The output is int and equals to the row count for SQL Data Manipulation Language (DML) statements.

Which method needs to be used to execute a DML statement using JDBC?

The DML operations of INSERT and UPDATE—that is, the write operations—are done by means of the prepareStatement() method of the Connection object created above. A call to this method takes variable bind parameters as input parameters and creates an object instance of the PreparedStatement class.

What is the return type of executeUpdate ()?

The JDBC standard states that the executeUpdate method returns a row count or 0. … For an SQL statement that can have an update count, such as an INSERT, UPDATE, DELETE, or MERGE statement, the returned value is the number of affected rows.

What does executeUpdate return in Java?

When the method executeUpdate is used to execute a DDL (data definition language) statement, such as in creating a table, it returns the int value of 0.

What is executeQuery?

executeQuery(): This method is used to execute statements that returns tabular data (example select). It returns an object of the class ResultSet.

Why ResultSet is used in Java?

The SQL statements that read data from a database query, return the data in a result set. The SELECT statement is the standard way to select rows from a database and view them in a result set. The java. … A ResultSet object maintains a cursor that points to the current row in the result set.

What happens if you call deleteRow () on a ResultSet object?

The deleteRow() method of the ResultSet interface deletes the current row from the ResultSet object and from the table.

Can I use same prepared statement multiple times?

Reusing a PreparedStatement Once a PreparedStatement is prepared, it can be reused after execution. You reuse a PreparedStatement by setting new values for the parameters and then execute it again.

How write parameterized SQL query in Java?

To prevent SQL Injections we must write parameterized queries. To create perameterised query in java we have PreparedStatement. It can take parameters by passing question marks (?) in the query and then by replacing each question mark index with required values.