Examples with AstSelect com.developmentontheedge.sql.model.AstSelect used on opensource projects

Example 26 with AstSelect

use of com.developmentontheedge.sql.model.AstSelect in project be5 by DevelopmentOnTheEdge.

the class DB2Transformer method transformSelect.

@Override
protected void transformSelect(AstSelect select) {
    AstLimit limit = select.getLimit();
    if (limit != null) {
        if (limit.getOffset() == 0)
            limit.setShape("FETCH FIRST", "ROWS ONLY");
        else {
            if (select.getOrderBy() == null)
                throw new IllegalStateException("The ranking function \"ROW_NUMBER\" must have an ORDER BY clause");
            select.dropLimit();
            SimpleNode parent = select.jjtGetParent();
            int idx = parent.indexOf(select);
            AstIdentifierConstant tmp = new AstIdentifierConstant("tmp");
            AstIdentifierConstant rn = new AstIdentifierConstant("rn");
            AstSelectList list = select.getSelectList();
            AstTableRef tableRef = new AstTableRef(select);
            tableRef.setAsToken(true);
            tableRef.addChild(tmp);
            AstFrom from = new AstFrom(tableRef);
            AstWhere where = new AstWhere();
            AstBetweenPredicate between = new AstBetweenPredicate(new AstFieldReference(tmp, rn), AstNumericConstant.of(limit.getOffset()), AstNumericConstant.of(limit.getOffset() + limit.getLimit()));
            where.addChild(between);
            AstSelect newSelect = new AstSelect((AstSelectList) list.clone(), from, where);
            AstFunNode func = parserContext.getFunction("row_number").node();
            AstDerivedColumn derCol = new AstDerivedColumn(new AstWindowFunction(func, new AstWindowSpecification(select.getOrderBy())));
            select.dropOrder();
            derCol.setPrefixComma(true);
            derCol.setAsToken(true);
            derCol.addChild(rn);
            if (list.isAllColumns()) {
                for (AstTableRef tr : select.getFrom().tableRefs()) {
                    String tableName = tr.getAlias() == null ? tr.getTable() : tr.getAlias();
                    list.addChild(new AstFieldReference(new AstIdentifierConstant(tableName), new AstIdentifierConstant("*")));
                }
            }
            list.addChild(derCol);
            parent.jjtAddChild(newSelect, idx);
        }
    }
    super.transformSelect(select);
}

Example 27 with AstSelect

use of com.developmentontheedge.sql.model.AstSelect in project be5 by DevelopmentOnTheEdge.

the class GenericDbmsTransformer method recursiveProcessing.

private void recursiveProcessing(SimpleNode node) {
    for (int i = 0; i < node.jjtGetNumChildren(); i++) {
        SimpleNode child = node.child(i);
        if (child instanceof AstFunNode) {
            transformFunction((AstFunNode) child);
        }
        if (child instanceof AstSelect) {
            transformSelect((AstSelect) child);
        }
        if (child instanceof AstIdentifierConstant) {
            transformIdentifier((AstIdentifierConstant) child);
        }
        if (child instanceof AstStringConstant) {
            transformString((AstStringConstant) child);
        }
        if (child instanceof AstCast) {
            transformCastExpression((AstCast) child);
        }
        if (child instanceof AstExtract) {
            transformExtractExpression((AstExtract) child);
        }
        if (child instanceof AstPosition) {
            transformPosition((AstPosition) child);
        }
        if (child instanceof AstInterval) {
            transformInterval((AstInterval) child);
        }
        if (child instanceof AstWith) {
            transformWith((AstWith) child);
        }
        if (child instanceof AstExcept) {
            transformExcept((AstExcept) child);
        }
        recursiveProcessing(child);
    }
}

Example 28 with AstSelect

use of com.developmentontheedge.sql.model.AstSelect in project be5 by DevelopmentOnTheEdge.

the class ColumnsApplier method keepOnlyOutColumns.

public void keepOnlyOutColumns(AstBeSqlSubQuery subQuery) {
    List<String> outColumns = Arrays.asList(subQuery.getOutColumns().split(","));
    AstSelect select = (AstSelect) subQuery.getQuery().child(0);
    AstSelectList selectList = select.getSelectList();
    if (selectList.isAllColumns()) {
        throw new IllegalStateException("All columns not support " + selectList.getNodeContent());
    } else {
        for (int i = selectList.jjtGetNumChildren() - 1; i >= 0; i--) {
            AstDerivedColumn derivedColumn = (AstDerivedColumn) selectList.jjtGetChild(i);
            if (!outColumns.contains(derivedColumn.getAlias().replace("\"", ""))) {
                derivedColumn.remove();
            }
        }
    }
}