How to call oracle function from java

Question

How to call oracle function from java?.

I have a oracle function aaa.fucntion(number,date);, this method returns true or false. how do call this from java and get the returned value?

I am using Hibernate

this is what i tried,

Session session = null;
            String associateHistorySQL="";

            try {
                session = HibernateUtil.currentSession();

                associateHistorySQL = "SELECT aa.myFunction(:aorId,:givenDate) from dual";

                Query associateHistoryQuery = session.createQuery(associateHistorySQL);

                associateHistoryQuery.setParameter("aorId", associateOfficeRecordId);
                associateHistoryQuery.setParameter("givenDate", date);

                List associateHistoryList = associateHistoryQuery.list();

                if (associateHistoryList != null && associateHistoryList.size() > 0 && new Integer(associateHistoryQuery.uniqueResult().toString()) > 0)
                    return true;
                else
                    return false;
            } finally {
                HibernateUtil.cleanUpHibernateFromDao(false);
            }

This is the exception i get unexpected token: aa: line 1:1: unexpected token: aa

thanks

Answer 1

There are actually multiple ways of doing so. But the easiest of them all is firing a query. Here's how to do it.

String sql="select myFunction('"+number+"','"+date"') from dual";
statement.execute(sql);

Set the input and output parameters if you are using JDBC.

If you are using hibernate use Named Queries something like this: YourMapping.hbm.xml

<sql-query name="my_function" callable="true">
<return alias="demo" class="net.bean.Demo">
<return-property name="id" column="id"/>
<return-property name="fname" column="fname"/>
<return-property name="lname" column="lname"/>
</return>
    {?=call demoFunc(:param1,:param2)}
</sql-query>

Now this will create a Named Query for the function

Next thing to do is simply call it using following code

Query query=session.getNamedQuery("my_function");
query.setParameter("parma1",date);
query.setParameter("parma2",number);
query.executeUpdate();

Note that in hbm.xml file the return class name and properties exists only apply if you have mapped the returning values if the function returning appropriate values.

Answer 2

Use session.doWork from hibernate.

How to call a Oracle function from hibernate with return parameter?

From Oracle documentation -

http://docs.oracle.com/cd/F49540_01/DOC/java.815/a64686/04_call5.htm

FUNCTION balance (acct_id NUMBER) RETURN NUMBER IS
  acct_bal NUMBER;
BEGIN
  SELECT bal INTO acct_bal FROM accts
    WHERE acct_no = acct_id;
  RETURN acct_bal;
END;

From a JDBC program, your call to the function balance might look like this:

CallableStatement cstmt = conn.prepareCall("{? = CALL balance(?)}");
cstmt.registerOutParameter(1, Types.FLOAT);
cstmt.setInt(2, acctNo);
cstmt.executeUpdate();
float acctBal = cstmt.getFloat(1);

Answer 3

oracle function:

FUNCTION ap_ch_get_acct_balances (VAR_PI_MOB_NO_ACCT_NO VARCHAR2,
VAR_REPLY_CODE OUT NUMBER, VAR_EXT_RESPONSE OUT VARCHAR2, VAR_PO_ACC_BAL OUT CHAR,
VAR_PO_ACCT_NO OUT CHAR)  

call in java:

String call = "{ ? = call FCRLIVE.AP_CH_GET_ACCT_BALANCES(?, ?, ?, ?, ?) }"; 

Answer 4

You can use CallableStatement

String sql="begin ? := aaaa.fucntion(?,?); end;";
CallableStatement stmt = connection.prepareCall(sql);
stmt.registerOutParameter(1, OracleTypes.BOOLEAN);
stmt.setInt(2, number);
stmt.setTimestamp(3, date);
stmt.execute();

After that you can read the returned value with:

stmt.getBoolean(1)

Answer 5

// Oracle Function

create or replace function addtwono(a in number, b in number) return varchar2 is
Result varchar2(10);
begin
result:= a + b;
--c:= result;
return('SUCCESS');
end ;

// Java Code ==========================================
String query = "begin ? := user.addtwono(?,?); end;";
CallableStatement st = connection.prepareCall(query);
st.registerOutParameter(1, OracleTypes.VARCHAR);
st.setInt(2, 10);
st.setInt(3, 15);
st.execute();
String rtn = st.getString(1);