Exemplo n.º 1
0
  public static String projectionOnTargetValuesFromCorrespondences(
      List<VariableCorrespondence> correspondences, String fromClause, String whereClause) {
    StringBuilder result = new StringBuilder();
    result.append(INDENT).append("select distinct \n");
    for (int i = 0; i < correspondences.size(); i++) {
      VariableCorrespondence correspondence = correspondences.get(i);

      if (correspondence.getSourcePaths() != null) {
        result
            .append(DOUBLE_INDENT)
            .append(GenerateSQL.attributeNameWithVariable(correspondence.getFirstSourcePath()));
      } else {
        String sourcePathName = correspondence.getSourceValue().toString();
        sourcePathName = sourcePathName.replaceAll("\"", "\'");
        result.append(DOUBLE_INDENT).append(sourcePathName);
      }

      result
          .append(" as ")
          .append(GenerateSQL.attributeNameInVariable(correspondence.getFirstSourcePath()));
      if (i != correspondences.size() - 1) result.append(",\n");
    }
    result.append("\n");
    result.append(INDENT).append(fromClause);
    if (!whereClause.equals("")) {
      result.append(INDENT).append(whereClause);
    }
    return result.toString();
  }
Exemplo n.º 2
0
 public static String generateProjectionForTgd(
     ComplexQueryWithNegations query,
     List<VariableCorrespondence> correspondences,
     int chainingStep) {
   String fromClause = GenerateSQL.generateFromClause(query.getVariables(), chainingStep);
   String whereClause = GenerateSQL.generateWhereClause(query.getComplexQuery());
   return projectionOnTargetValuesFromCorrespondences(correspondences, fromClause, whereClause);
 }
Exemplo n.º 3
0
  public String convertToPostgres(Expression transformationFunctionExpression, boolean withRel) {

    String functionExpression =
        transformationFunctionExpression.getJepExpression().toStringForSql();
    // first fix attribute names
    for (VariablePathExpression vpe : transformationFunctionExpression.getAttributePaths()) {
      if (functionExpression.contains(vpe.toString())) {
        String expressionToCheckForSigns =
            transformationFunctionExpression.getJepExpression().toString();
        int startIndex = expressionToCheckForSigns.indexOf(vpe.toString());
        int endIndex = startIndex + vpe.toString().length();
        boolean castToFloat = false;
        // check so that the String index will not get out of bounds
        if (startIndex - 2 >= 0) {
          if (math_sign.contains(expressionToCheckForSigns.charAt(startIndex - 2))) {
            castToFloat = true;
          }
          // to catch the '>=' or '<=' case
          else if (expressionToCheckForSigns.charAt(startIndex - 2) == '=' && startIndex - 3 >= 0) {
            if (expressionToCheckForSigns.charAt(startIndex - 3) == '<'
                || expressionToCheckForSigns.charAt(startIndex - 3) == '>') {
              castToFloat = true;
            }
          }
        }
        if (endIndex + 2 <= expressionToCheckForSigns.length()) {
          if (math_sign.contains(expressionToCheckForSigns.charAt(endIndex + 1))) {
            castToFloat = true;
          }
        }
        String newAttrName;
        // replace them with the corresponding attribute name
        if (withRel) {
          newAttrName = GenerateSQL.attributeNameWithVariable(vpe);
        } else {
          newAttrName = GenerateSQL.attributeNameInVariable(vpe);
        }
        // if previous or next character is one of {+,-,*,/,<,>} cast it to float
        if (castToFloat) {
          functionExpression =
              functionExpression.replaceAll(vpe.toString(), "cast(" + newAttrName + " as float)");
        } else {
          functionExpression = functionExpression.replaceAll(vpe.toString(), newAttrName);
        }
      }
    }
    return replaceExpression(functionExpression);
  }
Exemplo n.º 4
0
 public static String generateProjectionWithoutIntersection(
     ComplexConjunctiveQuery query, MappingTask mappingTask, int chainingStep) {
   StringBuilder result = new StringBuilder();
   List<SetAlias> sourceVariables = query.getVariables();
   String fromClause = GenerateSQL.generateFromClause(sourceVariables, chainingStep);
   String whereClause = GenerateSQL.generateWhereClause(query);
   result.append(INDENT).append("select distinct \n");
   //        List<SetAlias> variables = extractDifferentVariables(query.getVariables());
   List<SetAlias> variables = query.getVariables();
   result.append(generateProjectionOnAllAttributes(variables, mappingTask));
   result.append(INDENT).append(fromClause);
   if (!whereClause.equals("")) {
     result.append(INDENT).append(whereClause);
   }
   return result.toString();
 }
Exemplo n.º 5
0
  private static String generateWhereClauseForIntersection(ComplexConjunctiveQuery view) {
    StringBuilder result = new StringBuilder();
    result.append(INDENT).append("where \n");
    List<VariableSelectionCondition> allSelectionConditions = view.getAllSelections();
    List<VariableJoinCondition> joinConditions =
        new ArrayList<VariableJoinCondition>(view.getJoinConditions());
    for (SimpleConjunctiveQuery simpleConjunctiveQuery : view.getConjunctions()) {
      joinConditions.addAll(simpleConjunctiveQuery.getAllJoinConditions());
    }
    if (!joinConditions.isEmpty()) {
      for (int i = 0; i < joinConditions.size(); i++) {
        VariableJoinCondition joinCondition = joinConditions.get(i);
        result
            .append(DOUBLE_INDENT)
            .append(generateSQLStringForJoinConditionForIntersection(joinCondition, view));
        result.append(" AND\n");
      }
    }
    // check selection conditions
    for (int i = 0; i < allSelectionConditions.size(); i++) {
      VariableSelectionCondition condition = allSelectionConditions.get(i);
      result.append(DOUBLE_INDENT).append(GenerateSQL.sqlString(condition.getCondition()));
      if (i != allSelectionConditions.size() - 1 || view.hasIntersection()) result.append(" AND\n");
    }
    if (view.hasIntersection()) {
      List<VariablePathExpression> leftIntersectionPaths =
          generateTargetPaths(view.getIntersectionEqualities().getLeftCorrespondences());
      List<VariablePathExpression> rightIntersectionPaths =
          generateTargetPaths(view.getIntersectionEqualities().getRightCorrespondences());
      List<VariableCorrespondence> allCorrespondences = new ArrayList<VariableCorrespondence>();
      allCorrespondences.addAll(view.getIntersectionEqualities().getLeftCorrespondences());
      allCorrespondences.addAll(view.getIntersectionEqualities().getRightCorrespondences());

      for (int i = 0; i < leftIntersectionPaths.size(); i++) {
        VariablePathExpression leftPath = leftIntersectionPaths.get(i);
        VariablePathExpression rightPath = rightIntersectionPaths.get(i);
        VariablePathExpression leftSourcePath =
            findSourcePathWithEqualsId(allCorrespondences, leftPath);
        if (leftSourcePath == null) {
          leftSourcePath = leftPath;
        }
        VariablePathExpression rightSourcePath =
            findSourcePathWithEqualsId(allCorrespondences, rightPath);
        if (rightSourcePath == null) {
          rightSourcePath = rightPath;
        }
        result
            .append(DOUBLE_INDENT)
            .append(attributeNameWithVariable(leftSourcePath))
            .append(" = ")
            .append(attributeNameWithVariable(rightSourcePath));
        if (i != leftIntersectionPaths.size() - 1) result.append(" AND\n");
      }
    }
    result.append("\n");
    return result.toString();
  }
Exemplo n.º 6
0
 private static String generateSQLForSkolemTable(MappingTask mappingTask) {
   StringBuilder result = new StringBuilder();
   result.append(
       "\n--------------------------  SKOLEM TABLE  -------------------------------\n\n");
   result.append(CREATE_TABLE).append(SKOLEM_TABLE_NAME).append("(\n");
   result
       .append(INDENT)
       .append(SKOLEM_TABLE_COLUMN_ID)
       .append(" ")
       .append(mappingTask.getDBMSHandler().getAutoGeneratedColumnType())
       .append(",\n");
   result.append(INDENT).append(SKOLEM_TABLE_COLUMN_SKOLEM);
   result.append(GenerateSQL.getSkolemColumnType(mappingTask.getConfig()));
   allTablesToDelete.add(SKOLEM_TABLE_NAME);
   result.append(");\n");
   return result.toString();
 }
Exemplo n.º 7
0
 //    private static List<SetAlias> extractDifferentVariables(List<SetAlias> variables) {
 //        List<SetAlias> result = new ArrayList<SetAlias>();
 //        for (SetAlias variable : variables) {
 //            if (!containsVariableWithSameName(variable, result)) {
 //                result.add(variable);
 //            }
 //        }
 //        return result;
 //    }
 //    private static boolean containsVariableWithSameName(SetAlias variable, List<SetAlias>
 // variables) {
 //        for (SetAlias setAlias : variables) {
 //            if (setAlias.hasSameId(variable)) {
 //                return true;
 //            }
 //        }
 //        return false;
 //    }
 private static String generateProjectionOnAllAttributes(
     List<SetAlias> variables, MappingTask mappingTask) {
   StringBuilder result = new StringBuilder();
   for (int i = 0; i < variables.size(); i++) {
     SetAlias variable = variables.get(i);
     List<VariablePathExpression> attributes =
         variable.getAttributes(mappingTask.getSourceProxy().getIntermediateSchema());
     for (int j = 0; j < attributes.size(); j++) {
       VariablePathExpression attribute = attributes.get(j);
       result.append(DOUBLE_INDENT).append(GenerateSQL.attributeNameWithVariable(attribute));
       result.append(" AS ").append(attributeNameInVariable(attribute));
       if (j != attributes.size() - 1) result.append(",\n");
     }
     if (i != variables.size() - 1) result.append(",\n");
   }
   result.append("\n");
   return result.toString();
 }
Exemplo n.º 8
0
 ////////////////////////////////////////////// (
 public static String generateFromClause(List<SetAlias> variables, int chainingStep) {
   StringBuilder result = new StringBuilder();
   result.append("from ");
   List<String> addedVariables = new ArrayList<String>();
   for (int i = 0; i < variables.size(); i++) {
     SetAlias variable = variables.get(i);
     String relationName = GenerateSQL.sourceRelationName(variable, chainingStep);
     String aliasRelationName = GenerateSQL.RELATION_ALIAS_PREFIX + variable.toShortString();
     // NOTE: we are preventing to reuse the same variable twice in the from clause
     // this might not be correct in all cases
     if (!addedVariables.contains(aliasRelationName)) {
       addedVariables.add(aliasRelationName);
       result.append(relationName).append(" AS ").append(aliasRelationName);
       //                if (i != variables.size() - 1) result.append(", ");
       result.append(", ");
     }
   }
   result.delete(result.length() - ", ".length(), result.length() - 1);
   result.append("\n");
   return result.toString();
 }
Exemplo n.º 9
0
 private static String generateWhereClauseWithoutWhere(ComplexConjunctiveQuery view) {
   if (!isNeededAWhereClause(view)) {
     return "";
   }
   StringBuilder result = new StringBuilder();
   List<VariableSelectionCondition> allSelectionConditions = view.getAllSelections();
   List<SimpleConjunctiveQuery> conjunctions = view.getConjunctions();
   List<VariableJoinCondition> joinConditions =
       new ArrayList<VariableJoinCondition>(view.getJoinConditions());
   for (SimpleConjunctiveQuery simpleConjunctiveQuery : conjunctions) {
     joinConditions.addAll(simpleConjunctiveQuery.getAllJoinConditions());
   }
   if (!joinConditions.isEmpty()) {
     result.append("\n");
     for (int i = 0; i < joinConditions.size(); i++) {
       VariableJoinCondition joinCondition = joinConditions.get(i);
       List<VariableCorrespondence> correspondences = new ArrayList<VariableCorrespondence>();
       for (List<VariableCorrespondence> list : view.getCorrespondencesForConjunctions()) {
         correspondences.addAll(list);
       }
       result
           .append(DOUBLE_INDENT)
           .append(generateSQLStringForJoinConditionSourcePath(joinCondition, correspondences));
       if (i != joinConditions.size() - 1 || !allSelectionConditions.isEmpty())
         result.append(" AND\n");
     }
   }
   // check selection conditions
   for (int i = 0; i < allSelectionConditions.size(); i++) {
     VariableSelectionCondition condition = allSelectionConditions.get(i);
     result.append(DOUBLE_INDENT).append(GenerateSQL.sqlString(condition.getCondition()));
     if (i != allSelectionConditions.size() - 1) result.append(" AND\n");
   }
   result.append("\n");
   return result.toString();
 }