What does PreparedStatement executeQuery return?
executeQuery. Executes the SQL query in this PreparedStatement object and returns the ResultSet object generated by the query.
What is the return type of the method executeQuery String SQL?
ResultSet executeQuery (String SQL) − Returns a ResultSet object. Use this method when you expect to get a result set, as you would with a SELECT statement.
What does ResultSet return in Java?
Return value This method returns a boolean value specifying whether the ResultSet object contains more rows. If there are no rows next to its current position this method returns false, else it returns true. Using this method in the while loop you can iterate the contents of the result set.
What is the return type of execute () method?
Since this is a SELECT statement, the execute( ) method returns a boolean true to indicate that a result set is available. You can then call the Statement object’s getResultSet( ) method to retrieve the ResultSet object that contains the data from the database.
What is the difference between statement and PreparedStatement?
Statement is used for executing a static SQL statement in java JDBC. PreparedStatement is used for executing a precompiled SQL statement in java JDBC. java. PreparedStatement can be executed repeatedly, it can accept different parameters at runtime in java JDBC.
What is the difference between statement PreparedStatement and CallableStatement?
It is used when you want to use the database stored procedures. CallableStatement can accept runtime input parameters….Difference between CallableStatement and PreparedStatement :
| CallableStatement | PreparedStatement |
|---|---|
| Performance is very high. | Performance is better than Statement. |
What type of value is returned by the executeQuery () method of statement interface?
executeQuery(): This method is used to execute statements that returns tabular data (example select). It returns an object of the class ResultSet.
What is return type of execute query of statement object?
executeQuery() – Executes the given SQL statement, which returns a single ResultSet object. This ResultSet object contains data (which it gets from the Database)
How do I return the ResultSet?
To return a result set from an SQL procedure:
- Specify the DYNAMIC RESULT SETS clause in the CREATE PROCEDURE statement.
- DECLARE the cursor using the WITH RETURN clause.
- Open the cursor in the SQL procedure.
- Keep the cursor open for the client application – do not close it.
What is the return type of execute executeQuery and executeUpdate?
executeUpdate() : This method is used for execution of DML statement(INSERT, UPDATE and DELETE) which is return int value, count of the affected rows. executeQuery() : This method is used to retrieve data from database using SELECT query.
What does statement.executequery ( ) return in Java?
Statement.executeQuery () – Executes the given SQL statement, which returns a single ResultSet object. Now, when we use getXXX (); methods to read the content, it checks whether the asked data is present in ResultSet object or not, if yes, it returns the data from the resultSet object else Thanks for contributing an answer to Stack Overflow!
What happens when you execute executequery ( ) in JDBC?
While Executing the executeQuery () method, we need to keep in mind some important facts. We can call the executeQuery () method on statement object to select the data from the database. executeQuery () method returns ResultSet object. The ResultSet object contains rows of table.
What does executequery return to resultset reference variable?
And I want to know that executeQuery method return type is ResultSet. Then after execution of query, what executeQuery return to ResultSet reference variable. Will it return null or something else? In other words, for an empty table (or a query not matching any rows) resultSet.next () will evaluate to false and not cause an NPE.
How to execute a SQL statement in Java?
To execute a query, call an execute method from Statement such as the following: execute: Returns true if the first object that the query returns is a ResultSet object. Use this method if the query could return one or more ResultSet objects. executeQuery: Returns one ResultSet object.
