- What does the next method in a ResultSet return?
- What is SQL in Java?
- What is the return type of executeUpdate () in JDBC?
- What is the return type of execute update method?
- What is the difference between executeQuery () and executeUpdate ()?
- What is the return value of executeUpdate?
- Why ResultSet is used in Java?
- Which type of statement can execute parameterized queries?
- What is the return type of executeQuery ()?
- What is the use of executeUpdate in JDBC?
- Is Grant DDL or DML?
- Is JDBC an Autocommit?
- How can you execute a stored procedure in the database?
- Which method needs to be used to execute a DML statement using JDBC?
- How do you query in Java?
What does the next method in a ResultSet return?
The next method moves the cursor to the next row, and because it returns false when there are no more rows in the ResultSet object, it can be used in a while loop to iterate through the result set.
A default ResultSet object is not updatable and has a cursor that moves forward only..
What is SQL in Java?
SQL (Structured Query Language) is used to perform operations on the records stored in the database such as updating records, deleting records, creating and modifying tables, views, etc. SQL is just a query language; it is not a database.
What is the return type of executeUpdate () in JDBC?
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 is the return type of execute update method?
When the method execute returns true, the method getResultSet is called to retrieve the ResultSet object. When execute returns false, the method getUpdateCount returns an int. If this number is greater than or equal to zero, it indicates the update count returned by the statement.
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 is the return value of executeUpdate?
Return Values for the executeUpdate Method 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.
Why ResultSet is used in Java?
ResultSet interface represents the result set of a database query. A ResultSet object maintains a cursor that points to the current row in the result set. The term “result set” refers to the row and column data contained in a ResultSet object. Navigational methods: Used to move the cursor around.
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.
What is the return type of executeQuery ()?
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 use of executeUpdate in JDBC?
executeUpdate(): This method is used to execute statements such as insert, update, delete. It returns an integer value representing the number of rows affected.
Is Grant DDL or DML?
Data definition language (DDL) statements let you to perform these tasks: Create, alter, and drop schema objects. Grant and revoke privileges and roles. Analyze information on a table, index, or cluster.
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.
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 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.
How do you query in Java?
The Java source codeCreate a Java Connection to the MySQL database.Define the SELECT statement.Execute the SELECT query, getting a Java ResultSet from that query.Iterate over the ResultSet , getting the database fields (columns) from each row of data that is returned.Close the Java database connection.More items…•