protected SqlNode appendTopNode(SelectStatementNode node) {
SelectClauseNode select = new SelectClauseNode(node.getSelectClauseNode().getWordNode());
select.appendNode(new FragmentNode(" top (" + limit + ")"));
for (SqlNode child : node.getSelectClauseNode().getChildren()) {
select.appendNode(child);
}
SelectStatementNode result = new SelectStatementNode();
result.setSelectClauseNode(select);
result.setFromClauseNode(node.getFromClauseNode());
result.setWhereClauseNode(node.getWhereClauseNode());
result.setGroupByClauseNode(node.getGroupByClauseNode());
result.setHavingClauseNode(node.getHavingClauseNode());
result.setOrderByClauseNode(node.getOrderByClauseNode());
result.setForUpdateClauseNode(node.getForUpdateClauseNode());
result.setOptionClauseNode(node.getOptionClauseNode());
return result;
}
@Override
public SqlNode visitSelectStatementNode(SelectStatementNode node, Void p) {
if (processed) {
return node;
}
processed = true;
OrderByClauseNode originalOrderBy = node.getOrderByClauseNode();
OrderByClauseNode orderBy = node.getOrderByClauseNode();
if (originalOrderBy != null) {
orderBy = new OrderByClauseNode(originalOrderBy.getWordNode());
for (SqlNode child : originalOrderBy.getChildren()) {
orderBy.addNode(child);
}
} else {
orderBy = new OrderByClauseNode("");
}
orderBy.addNode(new FragmentNode(" limit "));
if (limit >= 0) {
orderBy.addNode(new FragmentNode(String.valueOf(limit)));
} else {
orderBy.addNode(new FragmentNode("0"));
}
if (offset >= 0) {
orderBy.addNode(new FragmentNode(" offset "));
orderBy.addNode(new FragmentNode(String.valueOf(offset)));
}
ForUpdateClauseNode forUpdate = node.getForUpdateClauseNode();
if (forUpdate != null) {
orderBy.addNode(new FragmentNode(" "));
}
SelectStatementNode result = new SelectStatementNode();
result.setSelectClauseNode(node.getSelectClauseNode());
result.setFromClauseNode(node.getFromClauseNode());
result.setWhereClauseNode(node.getWhereClauseNode());
result.setGroupByClauseNode(node.getGroupByClauseNode());
result.setHavingClauseNode(node.getHavingClauseNode());
result.setOrderByClauseNode(orderBy);
result.setForUpdateClauseNode(forUpdate);
return result;
}