public static SeQueryInfo parse(ISession session, PlainSelect select)
throws SeException, IOException {
String[] columns = null;
String[] tables = null;
String where = null;
String orderAndOrGroupByClause = null;
if (LOGGER.isLoggable(Level.FINER)) {
LOGGER.finer("building SeQueryInfo to reflect " + select);
}
// obtain needed SeQueryInfo components
columns = getColumns(session, select.getSelectItems());
tables = getTables(select.getFromItems());
Expression whereClause = select.getWhere();
if (whereClause != null) {
where = whereClause.toString();
}
if (select.getGroupByColumnReferences() != null
&& select.getGroupByColumnReferences().size() > 0) {
String gb = PlainSelect.getFormatedList(select.getGroupByColumnReferences(), " GROUP BY ");
orderAndOrGroupByClause = gb;
}
if (select.getOrderByElements() != null && select.getOrderByElements().size() > 0) {
String ob = PlainSelect.orderByToString(select.getOrderByElements());
if (orderAndOrGroupByClause == null) {
orderAndOrGroupByClause = "";
}
orderAndOrGroupByClause += " " + ob;
}
// build SeQueryInfo
SeQueryInfo qinfo = new SeQueryInfo();
qinfo.setColumns(columns);
SeSqlConstruct sqlConstruct = new SeSqlConstruct();
sqlConstruct.setTables(tables);
if (where != null) {
sqlConstruct.setWhere(where);
}
qinfo.setConstruct(sqlConstruct);
if (orderAndOrGroupByClause != null) {
qinfo.setByClause(orderAndOrGroupByClause);
}
return qinfo;
}
public void testOrderBy() throws JSQLParserException {
// TODO: should there be a DESC marker in the OrderByElement class?
String statement =
"SELECT * FROM tab1 WHERE a > 34 GROUP BY tab1.b ORDER BY tab1.a DESC, tab1.b ASC";
String statementToString =
"SELECT * FROM tab1 WHERE a > 34 GROUP BY tab1.b ORDER BY tab1.a DESC, tab1.b";
PlainSelect plainSelect =
(PlainSelect) ((Select) parserManager.parse(new StringReader(statement))).getSelectBody();
assertEquals(2, plainSelect.getOrderByElements().size());
assertEquals(
"tab1.a",
((Column) ((OrderByElement) plainSelect.getOrderByElements().get(0)).getColumnReference())
.getWholeColumnName());
assertEquals(
"b",
((Column) ((OrderByElement) plainSelect.getOrderByElements().get(1)).getColumnReference())
.getColumnName());
assertTrue(((OrderByElement) plainSelect.getOrderByElements().get(1)).isAsc());
assertFalse(((OrderByElement) plainSelect.getOrderByElements().get(0)).isAsc());
assertEquals(statementToString, "" + plainSelect);
ExpressionDeParser expressionDeParser = new ExpressionDeParser();
StringBuffer stringBuffer = new StringBuffer();
SelectDeParser deParser = new SelectDeParser(expressionDeParser, stringBuffer);
expressionDeParser.setSelectVisitor(deParser);
expressionDeParser.setBuffer(stringBuffer);
plainSelect.accept(deParser);
assertEquals(statement, stringBuffer.toString());
statement = "SELECT * FROM tab1 WHERE a > 34 GROUP BY tab1.b ORDER BY tab1.a, 2";
plainSelect =
(PlainSelect) ((Select) parserManager.parse(new StringReader(statement))).getSelectBody();
assertEquals(2, plainSelect.getOrderByElements().size());
assertEquals(
"a",
((Column) ((OrderByElement) plainSelect.getOrderByElements().get(0)).getColumnReference())
.getColumnName());
assertEquals(
2,
((ColumnIndex)
((OrderByElement) plainSelect.getOrderByElements().get(1)).getColumnReference())
.getIndex());
assertEquals(statement, "" + plainSelect);
}
/** @brief The following functions override functions of the interfaces. */
public void visit(PlainSelect plainSelect) throws Exception {
if (plainSelect.getFromItem() != null) {
if (plainSelect.getFromItem().getAlias() != null) {
this.aliasTableNameList.add(plainSelect.getFromItem().getAlias().getName());
}
plainSelect.getFromItem().accept(this);
}
if (plainSelect.getJoins() != null) {
for (Iterator joinsIt = plainSelect.getJoins().iterator(); joinsIt.hasNext(); ) {
Join join = (Join) joinsIt.next();
if (join.getRightItem().getAlias() != null) {
this.aliasTableNameList.add(join.getRightItem().getAlias().getName());
}
if (join.getOnExpression() != null) {
join.getOnExpression().accept(this);
}
join.getRightItem().accept(this);
}
}
// Select selectItem From fromItem, joinItem Where whereClause.
if (plainSelect.getSelectItems() != null) {
for (SelectItem selectItem : plainSelect.getSelectItems()) {
selectItem.accept(this);
}
}
if (plainSelect.getWhere() != null) {
plainSelect.getWhere().accept(this);
}
if (plainSelect.getGroupByColumnReferences() != null) {
for (Iterator groupByIt = plainSelect.getGroupByColumnReferences().iterator();
groupByIt.hasNext(); ) {
Expression groupBy = (Expression) groupByIt.next();
groupBy.accept(this);
}
}
if (plainSelect.getClusterByElements() != null) {
for (Iterator clusterByit = plainSelect.getClusterByElements().iterator();
clusterByit.hasNext(); ) {
ClusterByElement clusterByElement = (ClusterByElement) clusterByit.next();
visit(clusterByElement);
}
}
if (plainSelect.getDistributeByElements() != null) {
for (Iterator distributeByIt = plainSelect.getDistributeByElements().iterator();
distributeByIt.hasNext(); ) {
DistributeByElement distributeByElement = (DistributeByElement) distributeByIt.next();
visit(distributeByElement);
}
}
if (plainSelect.getOrderByElements() != null) {
for (Iterator orderByIt = plainSelect.getOrderByElements().iterator();
orderByIt.hasNext(); ) {
OrderByElement orderByElement = (OrderByElement) orderByIt.next();
orderByElement.accept(this);
}
}
if (plainSelect.getSortByElements() != null) {
for (Iterator sortByIt = plainSelect.getSortByElements().iterator(); sortByIt.hasNext(); ) {
SortByElement sortByElement = (SortByElement) sortByIt.next();
visit(sortByElement);
}
}
if (plainSelect.getHaving() != null) {
plainSelect.getHaving().accept(this);
}
}