Examples of org.h2.expression.Expression

org.h2.expression.Expression
An expression is a operation, a value, or a function in a query.

        default:
        }
        ExpressionVisitor v2 = visitor.incrementQueryLevel(1);
        boolean result = true;
        for (int i = 0, size = expressions.size(); i < size; i++) {
            Expression e = expressions.get(i);
            if (!e.isEverything(v2)) {
                result = false;
                break;
            }
        }
        if (result && condition != null && !condition.isEverything(v2)) {

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                    Parameter p = parameters.get(index);
                    if (p == null) {
                        throw getSyntaxError();
                    }
                    read(":");
                    Expression expr = readExpression();
                    expr = expr.optimize(session);
                    p.setValue(expr.getValue(session));
                } while (readIf(","));
                read("}");
                for (Parameter p : parameters) {
                    p.checkSet();
                }

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                Column column = readTableColumn(filter);
                columns.add(column);
            } while (readIf(","));
            read(")");
            read("=");
            Expression expression = readExpression();
            if (columns.size() == 1) {
                // the expression is parsed as a simple value
                command.setAssignment(columns.get(0), expression);
            } else {
                for (int i = 0, size = columns.size(); i < size; i++) {
                    Column column = columns.get(i);
                    Function f = Function.getFunction(database, "ARRAY_GET");
                    f.setParameter(0, expression);
                    f.setParameter(1, ValueExpression.get(ValueInt.get(i + 1)));
                    f.doneWithParameters();
                    command.setAssignment(column, f);
                }
            }
        } else {
            do {
                Column column = readTableColumn(filter);
                read("=");
                Expression expression;
                if (readIf("DEFAULT")) {
                    expression = ValueExpression.getDefault();
                } else {
                    expression = readExpression();
                }
                command.setAssignment(column, expression);
            } while (readIf(","));
        }
        if (readIf("WHERE")) {
            Expression condition = readExpression();
            command.setCondition(condition);
        }
        if (readIf("LIMIT")) {
            Expression limit = readTerm().optimize(session);
            command.setLimit(limit);
        }
        setSQL(command, "UPDATE", start);
        return command;
    }

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        return new TableFilter(session, table, alias, rightsChecked, currentSelect);
    }


    private Delete parseDelete() {
        Delete command = new Delete(session);
        Expression limit = null;
        if (readIf("TOP")) {
            limit = readTerm().optimize(session);
        }
        currentPrepared = command;
        int start = lastParseIndex;
        readIf("FROM");
        TableFilter filter = readSimpleTableFilter();
        command.setTableFilter(filter);
        if (readIf("WHERE")) {
            Expression condition = readExpression();
            command.setCondition(condition);
        }
        if (readIf("LIMIT") && limit == null) {
            limit = readTerm().optimize(session);
        }

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            ArrayList<Column> columnList = New.arrayList();
            ArrayList<Expression> values = New.arrayList();
            do {
                columnList.add(parseColumn(table));
                read("=");
                Expression expression;
                if (readIf("DEFAULT")) {
                    expression = ValueExpression.getDefault();
                } else {
                    expression = readExpression();
                }

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            String tableName = readIdentifierWithSchema(null);
            Schema schema = getSchema();
            if (readIf("(")) {
                Schema mainSchema = database.getSchema(Constants.SCHEMA_MAIN);
                if (equalsToken(tableName, RangeTable.NAME)) {
                    Expression min = readExpression();
                    read(",");
                    Expression max = readExpression();
                    read(")");
                    table = new RangeTable(mainSchema, min, max, false);
                } else {
                    Expression expr = readFunction(schema, tableName);
                    if (!(expr instanceof FunctionCall)) {
                        throw getSyntaxError();
                    }
                    FunctionCall call = (FunctionCall) expr;
                    if (!call.isDeterministic()) {

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                read("JOIN");
                joined = true;
                // the right hand side is the 'inner' table usually
                TableFilter newTop = readTableFilter(fromOuter);
                newTop = readJoin(newTop, command, nested, true);
                Expression on = null;
                if (readIf("ON")) {
                    on = readExpression();
                }
                if (nestedJoins) {
                    top = getNested(top);
                    newTop.addJoin(top, true, false, on);
                } else {
                    newTop.addJoin(top, true, false, on);
                }
                top = newTop;
                last = newTop;
            } else if (readIf("LEFT")) {
                readIf("OUTER");
                read("JOIN");
                joined = true;
                TableFilter join = readTableFilter(true);
                if (nestedJoins) {
                    join = readJoin(join, command, true, true);
                } else {
                    top = readJoin(top, command, false, true);
                }
                Expression on = null;
                if (readIf("ON")) {
                    on = readExpression();
                }
                top.addJoin(join, true, false, on);
                last = join;
            } else if (readIf("FULL")) {
                throw getSyntaxError();
            } else if (readIf("INNER")) {
                read("JOIN");
                joined = true;
                TableFilter join = readTableFilter(fromOuter);
                top = readJoin(top, command, false, false);
                Expression on = null;
                if (readIf("ON")) {
                    on = readExpression();
                }
                if (nestedJoins) {
                    top.addJoin(join, false, false, on);
                } else {
                    top.addJoin(join, fromOuter, false, on);
                }
                last = join;
            } else if (readIf("JOIN")) {
                joined = true;
                TableFilter join = readTableFilter(fromOuter);
                top = readJoin(top, command, false, false);
                Expression on = null;
                if (readIf("ON")) {
                    on = readExpression();
                }
                if (nestedJoins) {
                    top.addJoin(join, false, false, on);
                } else {
                    top.addJoin(join, fromOuter, false, on);
                }
                last = join;
            } else if (readIf("CROSS")) {
                read("JOIN");
                joined = true;
                TableFilter join = readTableFilter(fromOuter);
                if (nestedJoins) {
                    top.addJoin(join, false, false, null);
                } else {
                    top.addJoin(join, fromOuter, false, null);
                }
                last = join;
            } else if (readIf("NATURAL")) {
                read("JOIN");
                joined = true;
                TableFilter join = readTableFilter(fromOuter);
                Column[] tableCols = last.getTable().getColumns();
                Column[] joinCols = join.getTable().getColumns();
                String tableSchema = last.getTable().getSchema().getName();
                String joinSchema = join.getTable().getSchema().getName();
                Expression on = null;
                for (Column tc : tableCols) {
                    String tableColumnName = tc.getName();
                    for (Column c : joinCols) {
                        String joinColumnName = c.getName();
                        if (equalsToken(tableColumnName, joinColumnName)) {
                            join.addNaturalJoinColumn(c);
                            Expression tableExpr = new ExpressionColumn(database, tableSchema, last
                                    .getTableAlias(), tableColumnName);
                            Expression joinExpr = new ExpressionColumn(database, joinSchema, join
                                    .getTableAlias(), joinColumnName);
                            Expression equal = new Comparison(session, Comparison.EQUAL, tableExpr, joinExpr);
                            if (on == null) {
                                on = equal;
                            } else {
                                on = new ConditionAndOr(ConditionAndOr.AND, on, equal);
                            }

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                boolean canBeNumber = true;
                if (readIf("=")) {
                    canBeNumber = false;
                }
                SelectOrderBy order = new SelectOrderBy();
                Expression expr = readExpression();
                if (canBeNumber && expr instanceof ValueExpression && expr.getType() == Value.INT) {
                    order.columnIndexExpr = expr;
                } else if (expr instanceof Parameter) {
                    recompileAlways = true;
                    order.columnIndexExpr = expr;
                } else {
                    order.expression = expr;
                }
                if (readIf("DESC")) {
                    order.descending = true;
                } else {
                    readIf("ASC");
                }
                if (readIf("NULLS")) {
                    if (readIf("FIRST")) {
                        order.nullsFirst = true;
                    } else {
                        read("LAST");
                        order.nullsLast = true;
                    }
                }
                orderList.add(order);
            } while (readIf(","));
            command.setOrder(orderList);
            currentSelect = oldSelect;
        }
        if (database.getMode().supportOffsetFetch) {
            // make sure aggregate functions will not work here
            Select temp = currentSelect;
            currentSelect = null;


            // http://sqlpro.developpez.com/SQL2008/
            if (readIf("OFFSET")) {
                command.setOffset(readExpression().optimize(session));
                if (!readIf("ROW")) {
                    read("ROWS");
                }
            }
            if (readIf("FETCH")) {
                if (!readIf("FIRST")) {
                    read("NEXT");
                }
                if (readIf("ROW")) {
                    command.setLimit(ValueExpression.get(ValueInt.get(1)));
                } else {
                    Expression limit = readExpression().optimize(session);
                    command.setLimit(limit);
                    if (!readIf("ROW")) {
                        read("ROWS");
                    }
                }
                read("ONLY");
            }


            currentSelect = temp;
        }
        if (readIf("LIMIT")) {
            Select temp = currentSelect;
            // make sure aggregate functions will not work here
            currentSelect = null;
            Expression limit = readExpression().optimize(session);
            command.setLimit(limit);
            if (readIf("OFFSET")) {
                Expression offset = readExpression().optimize(session);
                command.setOffset(offset);
            } else if (readIf(",")) {
                // MySQL: [offset, ] rowcount
                Expression offset = limit;
                limit = readExpression().optimize(session);
                command.setOffset(offset);
                command.setLimit(limit);
            }
            if (readIf("SAMPLE_SIZE")) {

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            isOuter = isOuter | join.isJoinOuter();
            if (isOuter) {
                command.addTableFilter(join, false);
            } else {
                // make flat so the optimizer can work better
                Expression on = join.getJoinCondition();
                if (on != null) {
                    command.addCondition(on);
                }
                join.removeJoinCondition();
                top.removeJoin();

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        if (readIf("TOP")) {
            // can't read more complex expressions here because
            // SELECT TOP 1 +? A FROM TEST could mean
            // SELECT TOP (1+?) A FROM TEST or
            // SELECT TOP 1 (+?) AS A FROM TEST
            Expression limit = readTerm().optimize(session);
            command.setLimit(limit);
        } else if (readIf("LIMIT")) {
            Expression offset = readTerm().optimize(session);
            command.setOffset(offset);
            Expression limit = readTerm().optimize(session);
            command.setLimit(limit);
        }
        currentSelect = temp;
        if (readIf("DISTINCT")) {
            command.setDistinct(true);
        } else {
            readIf("ALL");
        }
        ArrayList<Expression> expressions = New.arrayList();
        do {
            if (readIf("*")) {
                expressions.add(new Wildcard(null, null));
            } else {
                Expression expr = readExpression();
                if (readIf("AS") || currentTokenType == IDENTIFIER) {
                    String alias = readAliasIdentifier();
                    boolean aliasColumnName = database.getSettings().aliasColumnName;
                    aliasColumnName |= database.getMode().aliasColumnName;
                    expr = new Alias(expr, alias, aliasColumnName);

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