- How do you execute DML statements in JDBC?
- What is the return type of executeUpdate ()?
- Is JDBC an Autocommit?
- What is return type of execute () method in struts2?
- What is the difference between executeQuery () and executeUpdate ()?
- What is a parameterized SQL query?
- Which method will be called for execution of DML statements?
- Which method is used to perform SQL query statements in JDBC?
- What is the return type of execute () method?
- What happens if you call deleteRow () on a ResultSet object?
- Which type of statement can execute parameterized queries?
- How can you execute a stored procedure in the database?
- Which of the following is used to call stored procedure?
- Which packages contain the JDBC classes?
- What are DML operations?
How do you execute DML statements in 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.
Is JDBC an Autocommit?
By default, JDBC uses an operation mode called auto-commit. This means that every update to the database is immediately made permanent. Any situation where a logical unit of work requires more than one update to the database cannot be done safely in auto-commit mode.
What is return type of execute () method in struts2?
Struts 2 actions don’t force you to implement any interface or extends class, it’s only required you to implement an execute() method that returns a string to indicate which result page should return. In the struts. xml, configure the action class with action tag and class attribute.
What is the difference between executeQuery () and executeUpdate ()?
What is the difference between execute(), executeQuery() and executeUpdate() methods in JDBC? … 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 a parameterized SQL query?
A parameterized query (also known as a prepared statement) is a means of pre-compiling a SQL statement so that all you need to supply are the “parameters” (think “variables”) that need to be inserted into the statement for it to be executed. It’s commonly used as a means of preventing SQL injection attacks.
Which method will be called for execution of DML statements?
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 is used to perform SQL query statements in JDBC?
To execute the statements, the Statement interface provides three methods namely, execute(), executeUpdate() and, executeQuery(). execute(): Used to execute SQL DDL statements, it returns a boolean value specifying whether the ResultSet object can be retrieved.
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 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. … Following JDBC program establishes connection with the database, deletes the last record from the Myplayers table and prints the contents of the table after the delete operation.
Which type of statement can execute parameterized queries?
Prepared Statement The PreparedStatement interface extends the Statement interface. It represents a precompiled SQL statement which can be executed multiple times. This accepts parameterized SQL quires and you can pass 0 or more parameters to this query.
How can you execute a stored procedure in the database?
To execute a stored procedure Expand the database that you want, expand Programmability, and then expand Stored Procedures. Right-click the user-defined stored procedure that you want and click Execute Stored Procedure.
Which of the following is used to call stored procedure?
Which of the following is used to call stored procedure? Explanation: CallableStatement is used in JDBC to call stored procedure from Java program.
Which packages contain the JDBC classes?
Explanation: The Java packages which contain JDBC classes and interfaces is Java. SQL.
What are DML operations?
A data manipulation language (DML) is a computer programming language used for adding (inserting), deleting, and modifying (updating) data in a database. … A popular data manipulation language is that of Structured Query Language (SQL), which is used to retrieve and manipulate data in a relational database.