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How to delete all records from a table in Oracle using JDBC API?
The SQL TRUNCATE statement is used to delete all the records from a table.
Syntax
TRUNCATE TABLE table_name;
To delete all the records from a table from using JDBC API you need to −
Register the Driver: Register the driver class using the registerDriver() method of the DriverManager class. Pass the driver class name to it, as parameter.
Establish a connection: Connect to the database using the getConnection() method of the DriverManager class. Passing URL (String), username (String), password (String) as parameters to it.
Create Statement: Create a Statement object using the createStatement() method of the Connection interface.
Execute the Query: Execute the query using the execute() method of the Statement interface.
Following JDBC program establishes connection with oracle database and deletes all the records in the table named dispatches −
Example
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
public class DeletingAllRows_Oracle {
public static void main(String args[]) throws SQLException {
//Registering the Driver
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
//Getting the connection
String oracleUrl = "jdbc:oracle:thin:@localhost:1521/xe";
Connection con = DriverManager.getConnection(oracleUrl, "system", "password");
System.out.println("Connection established......");
//Creating the Statement
Statement stmt = con.createStatement();
//Query to delete all records in a table
String query = "Truncate table DISPATCHES";
//Executing the query
stmt.execute(query);
System.out.println("Table truncated....");
}
}Output
Connection established...... Table truncated....
After deleting, if you verify the contents of the Dispatches table using select statement, you will get the output as −
SQL> select * from dispatches; no rows selected
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