Java Code Examples for com.alibaba.druid.sql.ast.statement.SQLSelectGroupByClause

The following examples show how to use com.alibaba.druid.sql.ast.statement.SQLSelectGroupByClause. These examples are extracted from open source projects. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source Project: Zebra   Source File: MySQLSelectASTVisitor.java    License: Apache License 2.0 5 votes vote down vote up
@Override
public boolean visit(SQLSelectGroupByClause x) {
	result.getMergeContext().increGroupByCount();
	List<String> groupByColumns = new ArrayList<String>();
	List<SQLExpr> items = x.getItems();

	for (SQLExpr expr : items) {
		groupByColumns.add(((SQLName) expr).getSimpleName());
	}

	result.getMergeContext().setGroupByColumns(groupByColumns);
	return true;
}
 
Example 2
Source Project: elasticsearch-sql   Source File: SqlParser.java    License: Apache License 2.0 4 votes vote down vote up
private void findGroupBy(MySqlSelectQueryBlock query, Select select) throws SqlParseException {
    SQLSelectGroupByClause groupBy = query.getGroupBy();

    //modified by xzb group by 增加Having语法
    if (null != query.getGroupBy() && null != query.getGroupBy().getHaving()) {
        select.setHaving(query.getGroupBy().getHaving().toString());
    }

    SQLTableSource sqlTableSource = query.getFrom();
    if (groupBy == null) {
        return;
    }
    List<SQLExpr> items = groupBy.getItems();

    List<SQLExpr> standardGroupBys = new ArrayList<>();
    for (SQLExpr sqlExpr : items) {
        //todo: mysql expr patch
        if (sqlExpr instanceof MySqlOrderingExpr) {
            MySqlOrderingExpr sqlSelectGroupByExpr = (MySqlOrderingExpr) sqlExpr;
            sqlExpr = sqlSelectGroupByExpr.getExpr();
        }
        if ((sqlExpr instanceof SQLParensIdentifierExpr || !(sqlExpr instanceof SQLIdentifierExpr || sqlExpr instanceof SQLMethodInvokeExpr)) && !standardGroupBys.isEmpty()) {
            // flush the standard group bys
            // zhongshu-comment 先将standardGroupBys里面的字段传到select对象的groupBys字段中,然后给standardGroupBys分配一个没有元素的新的list
            select.addGroupBy(convertExprsToFields(standardGroupBys, sqlTableSource));
            standardGroupBys = new ArrayList<>();
        }

        if (sqlExpr instanceof SQLParensIdentifierExpr) {
            // single item with parens (should get its own aggregation)
            select.addGroupBy(FieldMaker.makeField(((SQLParensIdentifierExpr) sqlExpr).getExpr(), null, sqlTableSource.getAlias()));
        } else if (sqlExpr instanceof SQLListExpr) {
            // multiple items in their own list
            SQLListExpr listExpr = (SQLListExpr) sqlExpr;
            select.addGroupBy(convertExprsToFields(listExpr.getItems(), sqlTableSource));
        } else {
            // everything else gets added to the running list of standard group bys
            standardGroupBys.add(sqlExpr);
        }
    }
    if (!standardGroupBys.isEmpty()) {
        select.addGroupBy(convertExprsToFields(standardGroupBys, sqlTableSource));
    }
}