有人用过JSqlParser吗

有人用过JSqlParser吗

jsqlparser的数据结构比较简单，更清晰，因而选择了一种正向强制设置order by属性为null的方式来去除order by。
public String removeOrderBy(String sql) throws JSQLParserException {
Statement stmt = CCJSqlParserUtil.parse(sql);
Select select = (Select) stmt;
SelectBody selectBody = select.getSelectBody();
processSelectBody(selectBody);
return select.toString();
}

public void processSelectBody(SelectBody selectBody) {
if (selectBody instanceof PlainSelect) {
processPlainSelect((PlainSelect) selectBody);
} else if (selectBody instanceof WithItem) {
WithItem withItem = (WithItem) selectBody;
if (withItem.getSelectBody() != null) {
processSelectBody(withItem.getSelectBody());
}
} else {
SetOperationList operationList = (SetOperationList) selectBody;
if (operationList.getPlainSelects() != null && operationList.getPlainSelects().size() > 0) {
List plainSelects = operationList.getPlainSelects();
for (PlainSelect plainSelect : plainSelects) {
processPlainSelect(plainSelect);
}
}
if (!orderByHashParameters(operationList.getOrderByElements())) {
operationList.setOrderByElements(null);
}
}
}

public void processPlainSelect(PlainSelect plainSelect) {
if (!orderByHashParameters(plainSelect.getOrderByElements())) {
plainSelect.setOrderByElements(null);
}
if (plainSelect.getFromItem() != null) {
processFromItem(plainSelect.getFromItem());
}
if (plainSelect.getJoins() != null && plainSelect.getJoins().size() > 0) {
List joins = plainSelect.getJoins();
for (Join join : joins) {
if (join.getRightItem() != null) {
processFromItem(join.getRightItem());
}
}
}
}

public void processFromItem(FromItem fromItem) {
if (fromItem instanceof SubJoin) {
SubJoin subJoin = (SubJoin) fromItem;
if (subJoin.getJoin() != null) {
if (subJoin.getJoin().getRightItem() != null) {
processFromItem(subJoin.getJoin().getRightItem());
}
}
if (subJoin.getLeft() != null) {
processFromItem(subJoin.getLeft());
}
} else if (fromItem instanceof SubSelect) {
SubSelect subSelect = (SubSelect) fromItem;
if (subSelect.getSelectBody() != null) {
processSelectBody(subSelect.getSelectBody());
}
} else if (fromItem instanceof ValuesList) {

} else if (fromItem instanceof LateralSubSelect) {
LateralSubSelect lateralSubSelect = (LateralSubSelect) fromItem;
if (lateralSubSelect.getSubSelect() != null) {
SubSelect subSelect = (SubSelect) (lateralSubSelect.getSubSelect());
if (subSelect.getSelectBody() != null) {
processSelectBody(subSelect.getSelectBody());
}
}
}
//Table时不用处理
}
public boolean orderByHashParameters(List orderByElements) {
if (orderByElements == null) {
return false;
}
for (OrderByElement orderByElement : orderByElements) {
if (orderByElement.toString().toUpperCase().contains("?")) {
return true;
}
}
return false;
}

用过。
jsqlparser的数据结构比较简单，更清晰，因而我选择了一种正向强制设置order by属性为null的方式来去除order by
由于jsqlparser结构简单，继承也不复杂，并且setter和getter方法很全面，所以处理起来很容易。
jsqlparser还能通过方法来编辑某部分的sql，例如增加一个查询列，增加一个表等等。更多的方法可以看wiki和源码。