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package com.sun.jdo.spi.persistence.support.sqlstore.sql.generator;
import com.sun.jdo.spi.persistence.support.sqlstore.*;
import com.sun.jdo.spi.persistence.support.sqlstore.model.LocalFieldDesc;
import java.sql.ResultSet;
import java.sql.SQLException;
/**
* Implements Select Plan for verifying clean VC instanses.
* @author Mitesh Meswani
*/
public class VerificationSelectPlan extends SelectQueryPlan {
/**
* Creates a new VerificationSelectQueryPlan.
*
* @param desc The Retrieve descriptor holding constraints
* @param store Store manager executing the query.
*/
public VerificationSelectPlan(RetrieveDesc desc, SQLStoreManager store) {
super(desc, store, null);
}
/**
* There are no real fields to be selected for verification query.
* This method just adds the tables for the version field.
*/
protected void processFields() {
LocalFieldDesc[] versionFields = config.getVersionFields();
for (int i = 0; i < versionFields.length; i++) {
LocalFieldDesc versionField = versionFields[i];
addTable(versionField);
}
}
protected Statement newStatement() {
return new SelectOneStatement(store.getVendorType(), this);
}
/**
* Checks whether the resultset from a verification query contains atleast
* one row.
* @param pm This parameter is not used.
* @param resultData The resultset containing result from the verification query
* @return true if the resultset contains atleast one row false otherwise.
* @throws SQLException
*/
public Object getResult(PersistenceManager pm, ResultSet resultData)
throws SQLException{
boolean verificationSuccessfull = resultData.next();
return Boolean.valueOf(verificationSuccessfull);
}
}