Spring JDBC Template. How can get outcome variable

Question

I am using NamedParameterJdbcTemplate for run pl/sql script. But I don't know how can I get the values ​​of out variables (:id_out). Thanks in advance.

String script = "declare 
                   begin 
                     if myFunc(:id_in) is null then 
                        :id_out := 0; 
                     else 
                        :id_out := 1; 
                     end if; 
                   end;";
Map<String,Object> bindVars = new HashMap<String, Object>();
bindVars.put(id_in,1);
bindVars.put(id_out,2);


jdbcTmpl.execute(script, bindVars, new PreparedStatementCallback<Object>() {
    @Override public Object doInPreparedStatement(PreparedStatement cs)
        throws SQLException, DataAccessException {
        cs.execute();
        return null;
                }
       }
       );

Answer 1

I don't believe you can use a NamedParameterJdbcTemplate (or any other subclass of JdbcTemplate) with anonymous PL/SQL blocks such as that above. You'll have to wrap your anonymous PL/SQL block into a stored procedure or function.

Spring is intended to be portable across databases. As far as I know, neither MySQL nor SQL Server have a concept analogous to Oracle's anonymous PL/SQL blocks (I'm happy to be proved wrong on this point, though). Since this feature isn't portable across databases, Spring can't really support it for just Oracle.

Answer 2

List<SqlParameter> params = new LinkedList<SqlParameter>();
params.add(new SqlParameter(Types.NUMERIC));
params.add(new SqlParameter(Types.NUMERIC));
params.add(new SqlOutParameter("out_param_1", Types.NUMERIC));
params.add(new SqlOutParameter("out_param_2", Types.NUMERIC));
Map<String, Object> ret = simpleJdbcTemplate.getJdbcOperations().call(
new CallableStatementCreator() {

    @Override
    public CallableStatement createCallableStatement(Connection con) throws SQLException {
        CallableStatement cs = con.prepareCall("DECLARE ..." + 
                                               "BEGIN ... " + 
                                               "delete from table where table_field_1 = ? and table_field_2 = ? " + 
                                               "returning out_param_1, out_param_2 into ?, ?; " + 
                                               "END;"
        cs.setInt(1, first_in_param_value);
        cs.setInt(2, second_in_param_value);
        cs.registerOutParameter(3, Types.NUMERIC);
        cs.registerOutParameter(4, Types.NUMERIC);
        return cs;
    }
}, params);

ret.get("out_param_1");
ret.get("out_param_1");

Answer 3

It can be done with a plain JdbcTemplate as in the following example, but note the way that the OUT value must be specified in the anonymous plsql block with "? := 'something';

java parameters used below: String id="12345" and String fixSql=

    declare
        p_id VARCHAR2(20) := null; 
        p_status_message VARCHAR2(32767) := null;
    begin
        p_id := ?;
        p_status_message := ' Everything is possible: ' || p_id;
        ? := 'Return text.' || p_status_message;
    end;

Note the two question marks above - the first is effectively an IN parameter and the second an OUT parameter. This code will call it:

    public class Foo extends JdbcDaoSupport {
    ...
    public String doAnonymousPlSql(final String id, String fixSql) throws CustomerFixException {
        String resultValue = getJdbcTemplate().execute(new CallableStatementCreator() {
            @Override
            public CallableStatement createCallableStatement(Connection connection) throws SQLException {
                CallableStatement sql = connection.prepareCall(fixSql);
                sql.setString(1, id);
                sql.registerOutParameter(2, Types.VARCHAR);
                return sql;
            }
        }
        , new CallableStatementCallback<String>() {
            @Override
            public String doInCallableStatement(CallableStatement callablestatement) throws SQLException,
                    DataAccessException {
                callablestatement.executeUpdate();
                return (String) callablestatement.getObject(2);
            }
        });