/**
* Returns the "select" SQL statement based on terms and source attributes
*
* @param tableName the source name of this relation
* @return "select" SQL statement
*/
public ArrayList<String> getSelect(String tableName) {
// System.out.println("P in getSelect():" + this + "***" +
// this.hashCode());
ArrayList<String> select = new ArrayList<String>();
for (int i = 0; i < source.getTerms().size(); i++) {
Term t = source.getTerms().get(i);
if (t.getVar() == null) continue;
SourceAttribute sourceAttr = source.getSourceAttribute(i);
// I'm adding a space at then end, so it's easier when I have to
// search for the var name
// otherwise if I search for "S" it will return true for any
// variable that starts with "S"
select.add(tableName + "." + sourceAttr.getSQLName() + " as " + t.getVar() + " ");
}
return select;
}
/**
* Returns the "where" SQL statement based on terms and sourceAttrs. <br>
* If the term is a constant or it is a bound variable that is satisfied by a constant <br>
* a comparison is added to the where clause
*
* @param tableName the source name of this relation
* @param child the child of the DataAccessNode that represents this relation
* @return "where" SQL statement
* @throws MediatorException
*/
public ArrayList<String> getWhere(String tableName, SimpleBaseNode child)
throws MediatorException {
ArrayList<String> where = new ArrayList<String>();
for (int i = 0; i < source.getTerms().size(); i++) {
Term t = source.getTerms().get(i);
SourceAttribute sourceAttr = source.getSourceAttribute(i);
boolean isBound = sourceAttr.needsBinding();
// System.out.println("Pred=" + name + " SourceAttr is bound " +
// sourceAttr + " " + isBound);
String bindMarker = "";
if (isBound) {
bindMarker = "@";
}
if (t instanceof ConstTerm) {
String val = ((ConstTerm) t).getSqlVal(sourceAttr.isNumber());
if (val.equals(MediatorConstants.NULL_VALUE))
where.add(bindMarker + tableName + "." + sourceAttr.getSQLName() + " IS " + val);
else where.add(bindMarker + tableName + "." + sourceAttr.getSQLName() + " = " + val);
}
if (t instanceof FunctionTerm) {
if (child != null) {
// I have attribute binding patterns in the function
where.add(
bindMarker
+ tableName
+ "."
+ sourceAttr.getSQLName()
+ " = "
+ child.getActualName(((FunctionTerm) t).getFunction()));
} else {
// the function has only constants as input
where.add(
bindMarker
+ tableName
+ "."
+ sourceAttr.getSQLName()
+ " = "
+ ((FunctionTerm) t).getFunctionForSQL());
}
}
}
for (int i = 0; i < source.getTerms().size(); i++) {
Term t = source.getTerms().get(i);
SourceAttribute sourceAttr1 = source.getSourceAttribute(i);
// System.out.println("Find duplicate terms:" + t);
if (t instanceof VarTerm) {
// System.out.println("Not Constant...");
int j = i + 1;
while (j > 0) {
j = source.findTerm(t, j);
if (j > 0) {
SourceAttribute sourceAttr2 = source.getSourceAttribute(j);
where.add(
tableName
+ "."
+ sourceAttr1.getSQLName()
+ " = "
+ tableName
+ "."
+ sourceAttr2.getSQLName());
j++;
}
}
}
}
return where;
}