execute : Returns true if the first object that the query returns is a ResultSet object. … 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 is the return type execute () Java?
boolean execute(String SQL) : Returns a boolean value of true if a ResultSet object can be retrieved; otherwise, it returns false. … Use this method when you expect to get a result set, as you would with a SELECT statement.
What does the execute method return?
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 execute () in Java?
The execute() method of ThreadPoolExecutor class executes the given task sometime in the future. The task may execute in a new thread or an existing pooled thread. If the task is not submitted to the pool due to any reason, then the task is handled by the current RejectedExecutionHandler.
What does the execute () method do?
The execute() method: This method is used to execute SQL DDL statements, it returns a boolean value specifying weather the ResultSet object can be retrieved.
What is the return value of execute in statement interface which is used to execute any SQL statement?
The “execute” method executes a SQL statement and indicates the form of the first result. You can then use getResultSet or getUpdateCount to retrieve the result, and getMoreResults to move to any subsequent result(s). getResultSet returns the current result as a ResultSet.
What does executeUpdate return in Java?
The executeUpdate() method returns the number of rows affected by the SQL statement (an INSERT typically affects one row, but an UPDATE or DELETE statement can affect more). If executeUpdate() returns without throwing an error, the call to System. out.
Which execute method is used to read data from the table?
executeQuery method. To retrieve data from a table using a SELECT statement with parameter markers, you use the PreparedStatement. executeQuery method. This method returns a result table in a ResultSet object.
What is the return value of the execute () method when an SQL SELECT statement is executed and there are no rows corresponding to the query?
The ExecuteReader Method will return the result set of a SELECT . This method is to be used when you’re querying for a bunch of results, such as rows from a table, view, whatever. The ExecuteScalar Method will return a single value in the first row, first column from a SELECT statement.
What is difference between submit () and execute () in Java?
The difference is that execute simply starts the task without any further ado, whereas submit returns a Future object to manage the task. You can do the following things with the Future object: The Future interface is more useful if you submit a Callable to the pool.
What is future object in Java?
A Java Future, java. util. … Future , represents the result of an asynchronous computation. When the asynchronous task is created, a Java Future object is returned. This Future object functions as a handle to the result of the asynchronous task.
What is difference between executor submit () and executer execute ()?
1) The submit() can accept both Runnable and Callable tasks but execute() can only accept the Runnable task. 2) The submit() method is declared in the ExecutorService interface while the execute() method is declared in the Executor interface.
What is difference between execute and executeQuery?
3 Answers. boolean execute(): Executes the SQL statement in this Prepared Statement object, which may be any kind of SQL statement. ResultSet executeQuery(): Executes the SQL query in this Prepared Statement object and returns the ResultSet object generated by the query.
What is return type of execute update method?
The JDBC standard states that the executeUpdate method returns a row count or 0. However, if the executeUpdate method is executed against a Db2 for z/OS server, it can return a value of -1.
What is execute query?
Execute Query is an operating system independent database utility written entirely in Java. Using the flexibility provided by Java Database Connectivity (JDBC), Execute Query provides a simple way to interact with almost any database from simple queries to table creation and import/export of an entire schema’s data.