How to get generated Id using node-jdbc?

Question

I'm using node-jdbc and oracle driver "ojdbc6_g.jar" to connect to an Oracle database. I want to execute some insert queries.

The problem:

How to get generated Id when inserting a row into oracle using node-jdbc?

I tried to call statement.getGeneratedKeys() but it returns the following error in callback:

> { [Error: Error running instance method java.sql.SQLException:
> operation not allowed
>         at oracle.jdbc.driver.OracleStatement.getGeneratedKeys(OracleStatement.java:8425)
>         at oracle.jdbc.driver.OracleStatementWrapper.getGeneratedKeys(OracleStatementWrapper.java:1106)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:483) ] cause: {} }

Answer 1

I tested some solutions and finally I managed to get ROWID of the new inserted row. ROWID is a unique key which oracle uses for each row of a table and is different from auto increament ID. In fact, oracle maps each row to a unique ROWID.

Having ROWID we can SELECT the inserted row and get every columns of it.

select * from 'table_name' where rowid = 'obtained rowid'

To get generated keys we should call statement.executeUpdate() with parameter "1", so we can use statement.getGeneratedKeys().

Here is my modification to jdbc node module to get ROWID:

JDBCConn.prototype.executeInsert = function (sql, callback, getGeneratedKeys) {
    var self = this;

    self._conn.createStatement(function (err, statement) {
        if (err) {
            return callback(err);
        }
        else {
            // calling `statement.executeUpdate()` with parameter 1
            statement.executeUpdate(sql, 1, function (err, rowcount) {
                if (err) {
                    return callback(err);
                }
                else {
                    if (getGeneratedKeys) {
                        statement.getGeneratedKeys(function (err, resultset) {
                            resultset.getMetaData(function (err, rsmd) {
                                if (err) {
                                    return callback(err);
                                } else {
                                    var results = [];
                                    var cc = rsmd.getColumnCountSync();
                                    var columns = [''];
                                    for (var i = 1; i <= cc; i++) {
                                        var colname = rsmd.getColumnNameSync(i);
                                        columns.push(colname);
                                    }
                                    var next = resultset.nextSync();
                                    var processRow = function (next) {
                                        if (next) {
                                            setImmediate(function () {
                                                var row = {};
                                                for (var a = 1; a <= cc; a++) {
                                                    row[columns[a]] = trim1(resultset.getStringSync(a));
                                                }
                                                results.push(row);
                                                next = resultset.nextSync();
                                                processRow(next);
                                            });
                                        } else {
                                            callback(null, rowcount, results);
                                        }
                                    };
                                    processRow(next);
                                }
                            });
                        });
                    }
                    else {
                        callback(null, rowcount);
                    }
                }
            });
        }
    });
};

results is an array of objects like:

[ { ROWID: 'AAAVTcAAEAAAADzAAK' } ]

Wish it is helpful.