Call pl/sql function in java?

Question

So I\'ve got a function that checks how many cancellations are in my booking table:

CREATE OR REPLACE FUNCTION total_cancellations
RETURN number IS
   t_canc         


        

Answer 1

Prepare a Callable Statement

There are two formats available, the familiar block syntax used by Oracle and the ANSI 92 standard syntax. In the case of our sample program, the block syntax has the form: CallableStatement vStatement = vDatabaseConnection.prepareCall( "begin ? := javatest( ?, ? ); end;" );

The ANSI 92 syntax has the form:

   CallableStatement vStatement = 
           vDatabaseConnection.prepareCall( "{ ? = call javatest( ?, ? )}");

source

If you receive the below error, you might want to use the first format.

total_cancellations is not a procedure or is undefined error.

Sample code.

Class.forName("oracle.jdbc.driver.OracleDriver");
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@xx.xxx.xx.xxx:1521:xxx", "user","pass");
CallableStatement cstmt = conn.prepareCall("begin ? := TEST_FUNC(?,?); end;");
cstmt.registerOutParameter(1, Types.INTEGER);
cstmt.setString(2, "Test");
cstmt.setInt(3, 1001);
cstmt.execute();
int result = cstmt.getInt(1);
System.out.print("Result: " + result);
cstmt.close();
conn.close();