6. The process of plsql

Procedure
Procedures are used to perform specific actions. When building a procedure, you can specify both input parameters (in) and output parameters (out) . By using input parameters in the procedure, data can be passed to the execution part; by using output parameters, the data of the execution part can be passed to the application environment. In sqlplus, you can use the create procedure command to create a procedure.

The example is as follows:
1. Write a procedure, you can enter the employee name, and the new salary can modify the employee's salary
SQL> create procedure sun_pro3(sunName varchar2, newSal number) is
  2 begin
  3 -- the execution part, modify the salary according to the user name
  4 update kkkk set sal=newSal where ename=sunName;
  5 end;
  6 /
Procedure created

to call the stored procedure
SQL> exec sun_pro3('SCOTT',4958);
PL/SQL procedure successfully completed


2. How to call the procedure?
Two methods: call and exec + procedure name, the difference is that if there are no parameters, exec + procedure name call + procedure name ()


3. How to call a stored procedure in a java program?

package comSun;
import java.sql.Statement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;

// Demonstrate how to use the jdbc_odbc bridge connection method
public class TestOra {
	public static void main(String[] args) {
		try {
			//load driver
			Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
			// get the connection
			//The first "" is the configuration source, the second "" is the ORACLE user name, and the third "" is the password of the user name
			//The configuration source in the first "" requires the ODBC manager in the management tool in the control panel to create a data source to match
			Connection ct = DriverManager.getConnection("jdbc:odbc:testsp","scott","tiger");
			
			//The same as mysql from below
			Statement sm = ct.createStatement();
			
			ResultSet rs = sm.executeQuery("select * from emp");
			
			while(rs.next())
			{
				//Get the username from the database
				System.out.println("Username:"+rs.getString(2));
			}
		} catch (Exception e) {
			e.printStackTrace ();
		}
	}
}