I am working on a new payment module for Magento and have come across an issue that I cannot explain. The following code that runs after the credit card is verified:

    $table_prefix = Mage::getConfig()->getTablePrefix();
    $tableName = $table_prefix.'authorizecim_magento_id_link';

    $resource = Mage::getSingleton('core/resource');
    $writeconnection = $resource->getConnection('core_write');

    $acPI = $this->_an_customerProfileId;
    $acAI = $this->_an_customerAddressId;
    $acPPI = $this->_an_customerPaymentProfileId;

    $sql = "insert into {$tableName} values ('', '$customerId', '$acPI', '$acPI', '3')";
    $writeconnection->query($sql);

    $sql = "insert into {$tableName} (magCID, anCID, anOID, anObjectType) values ('$customerId', '$acPI', '$acAI', '2')";
    $writeconnection->query($sql);

    $sql = "insert into {$tableName} (magCID, anCID, anOID, anObjectType) values ('$customerId', '$acPI', '$acPPI', '1')";
    $writeconnection->query($sql);

I have verified using Firebug and FirePHP that the SQL queries are syntactically correct and no errors are returned.

The odd thing here is that I have checked the database, and the autoincrement value is incremented on every run of the code. However, no rows are inserted in the database. I have verified this by adding a die(); statement directly after the first write.

Any ideas why this would be occuring?

The relative portion of the config.xml is this:

<config>
    <global>
        <models>
            <authorizecim>
                <class>CPAP_AuthorizeCim_Model</class>
            </authorizecim>
            <authorizecim_mysql4>
                <class>CPAP_AuthorizeCim_Model_Mysql4</class>
                <entities>
                    <anlink>
                        <table>authorizecim_magento_id_link</table>
                    </anlink>
                </entities>
                <entities>
                    <antypes>
                        <table>authorizecim_magento_types</table>
                    </antypes>
                </entities>
            </authorizecim_mysql4>
        </models>
        <resources>
            <authorizecim_setup>
                <setup>
                    <module>CPAP_AuthorizeCim</module>
                    <class>CPAP_AuthorizeCim_Model_Resource_Mysql4_Setup</class>
                </setup>
                <connection>
                    <use>core_setup</use>
                </connection>
            </authorizecim_setup>
            <authorizecim_write>
                <connection>
                    <use>core_write</use>
                </connection>
            </authorizecim_write>
            <authorizecim_read>
                <connection>
                    <use>core_read</use>
                </connection>
            </authorizecim_read>
        </resources>
    </global>
</config>