- What is procedure in SQL?
- What happens if you call the method close () on a ResultSet object?
- What is parameterized query with example?
- How does parameterized query work?
- How parameterized query is implemented?
- What is CallableStatement?
- Which method in statement should be used to execute a DDL command?
- Can we use same prepared statement for multiple queries?
- What is parameterized query in Java?
- Which character is used to represent an input parameter in a PreparedStatement?
- What is the difference between prepared statement and statement?
- Is the return type of next () method in ResultSet?
What is procedure in SQL?
A stored procedure in PL/SQL is nothing but a series of declarative SQL statements which can be stored in the database catalogue.
A procedure can be thought of as a function or a method.
They can be invoked through triggers, other procedures, or applications on Java, PHP etc..
What happens if you call the method close () on a ResultSet object?
close() (emphasis mine): Releases this ResultSet object’s database and JDBC resources immediately instead of waiting for this to happen when it is automatically closed. The closing of a ResultSet object does not close the Blob , Clob or NClob objects created by the ResultSet .
What is parameterized query with example?
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.
How does parameterized query work?
The way parameterized queries work, is that the sqlQuery is sent as a query, and the database knows exactly what this query will do, and only then will it insert the username and passwords merely as values. This means they cannot effect the query, because the database already knows what the query will do.
How parameterized query is implemented?
The data type of the field and its position in the query is defined. This technique separates the SQL logic from the user input and also defines the type of data expected in the fields. … SQL parameterized query should be implemented in in all SELECT, INSERT, UPDATE, DELETE queries.
What is CallableStatement?
A CallableStatement object provides a way to call stored procedures in a standard way for all RDBMSs. A stored procedure is stored in a database; the call to the stored procedure is what a CallableStatement object contains.
Which method in statement should be used to execute a DDL command?
Statement is suitable for executing DDL commands – CREATE , DROP , ALTER , and TRUNCATE in Java JDBC….Statement important methods in Java JDBC are:executeUpdate.executeQuery.executeBatch.execute.
Can we use same prepared statement for multiple queries?
5 Answers. Yes you can re-use a Statement (specifically a PreparedStatement ) and should do so in general with JDBC. It would be inefficient & bad style if you didn’t re-use your statement and immediately created another identical Statement object.
What is parameterized 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.
Which character is used to represent an input parameter in a PreparedStatement?
symbol, which is known as the parameter marker. You must supply values for every parameter before executing the SQL statement. The setXXX() methods bind values to the parameters, where XXX represents the Java data type of the value you wish to bind to the input parameter.
What is the difference between prepared statement and statement?
Statement will be used for executing static SQL statements and it can’t accept input parameters. PreparedStatement will be used for executing SQL statements many times dynamically. It will accept input parameters.
Is the return type of next () method in ResultSet?
This method return true if there’s another row or false otherwise. and the next() method of ResultSet class help to move the cursor to the next row of a returned result set which is rs in your example.