Examples with ScanController org.apache.derby.iapi.store.access.ScanController used on opensource projects

Example 61 with ScanController

use of org.apache.derby.iapi.store.access.ScanController in project derby by apache.

the class CacheLock method saveProperty.

void saveProperty(TransactionController tc, String key, Serializable value) throws StandardException {
    if (saveServiceProperty(key, value))
        return;
    // Do a scan to see if the property already exists in the Conglomerate.
    ScanController scan = this.openScan(tc, key, TransactionController.OPENMODE_FORUPDATE);
    DataValueDescriptor[] row = makeNewTemplate();
    if (scan.fetchNext(row)) {
        if (value == null) {
            // A null input value means that we should delete the row
            scan.delete();
        } else {
            // a value already exists, just replace the second columm
            row[1] = new UserType(value);
            scan.replace(row, (FormatableBitSet) null);
        }
        scan.close();
    } else {
        // The value does not exist in the Conglomerate.
        scan.close();
        scan = null;
        if (value != null) {
            // not a delete request, so insert the new property.
            row = makeNewTemplate(key, value);
            ConglomerateController cc = tc.openConglomerate(propertiesConglomId, false, TransactionController.OPENMODE_FORUPDATE, TransactionController.MODE_TABLE, TransactionController.ISOLATION_SERIALIZABLE);
            cc.insert(row);
            cc.close();
        }
    }
}