Examples of expression.Expression

org.h2.expression.Expression
interface for expressions To build expressions in a concrete CSP solver syntax, need to implement ExpressionVisitor @author Hélène Collavizza @date June 2008

        }
        if (readIf("AS")) {
            if (isIdentity) {
                getSyntaxError();
            }
            Expression expr = readExpression();
            column.setComputedExpression(expr);
        } else if (readIf("DEFAULT")) {
            Expression defaultExpression = readExpression();
            column.setDefaultExpression(session, defaultExpression);
        } else if (readIf("GENERATED")) {
            if (!readIf("ALWAYS")) {
                read("BY");
                read("DEFAULT");

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            column.setDefaultExpression(session, templateColumn.getDefaultExpression());
            int selectivity = templateColumn.getSelectivity();
            if (selectivity != Constants.SELECTIVITY_DEFAULT) {
                column.setSelectivity(selectivity);
            }
            Expression checkConstraint = templateColumn.getCheckConstraint(session, columnName);
            if (checkConstraint != null) {
                column.addCheckConstraint(session, checkConstraint);
            }
        }
        column.setComment(comment);

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        do {
            int i = 0;
            ArrayList<Expression> row = New.arrayList();
            boolean multiColumn = readIf("(");
            do {
                Expression expr = readExpression();
                expr = expr.optimize(session);
                int type = expr.getType();
                long prec;
                int scale, displaySize;
                Column column;
                String columnName = "C" + (i + 1);
                if (rows.size() == 0) {
                    if (type == Value.UNKNOWN) {
                        type = Value.STRING;
                    }
                    DataType dt = DataType.getDataType(type);
                    prec = dt.defaultPrecision;
                    scale = dt.defaultScale;
                    displaySize = dt.defaultDisplaySize;
                    column = new Column(columnName, type, prec, scale, displaySize);
                    columns.add(column);
                }
                prec = expr.getPrecision();
                scale = expr.getScale();
                displaySize = expr.getDisplaySize();
                if (i >= columns.size()) {
                    throw DbException.get(ErrorCode.COLUMN_COUNT_DOES_NOT_MATCH);
                }
                Column c = columns.get(i);
                type = Value.getHigherOrder(c.getType(), type);

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        Schema schema = getSchema();
        if (isKeyword(constantName)) {
            throw DbException.get(ErrorCode.CONSTANT_ALREADY_EXISTS_1, constantName);
        }
        read("VALUE");
        Expression expr = readExpression();
        CreateConstant command = new CreateConstant(session, schema);
        command.setConstantName(constantName);
        command.setExpression(expr);
        command.setIfNotExists(ifNotExists);
        return command;

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        CreateUserDataType command = new CreateUserDataType(session);
        command.setTypeName(readUniqueIdentifier());
        read("AS");
        Column col = parseColumnForTable("VALUE", true);
        if (readIf("CHECK")) {
            Expression expr = readExpression();
            col.addCheckConstraint(session, expr);
        }
        col.rename(null);
        command.setColumn(col);
        command.setIfNotExists(ifNotExists);

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                } else if (readIf("NOT")) {
                    read("NULL");
                    command.setType(CommandInterface.ALTER_TABLE_ALTER_COLUMN_NOT_NULL);
                    return command;
                } else if (readIf("DEFAULT")) {
                    Expression defaultExpression = readExpression();
                    command.setType(CommandInterface.ALTER_TABLE_ALTER_COLUMN_DEFAULT);
                    command.setDefaultExpression(defaultExpression);
                    return command;
                }
            } else if (readIf("RESTART")) {
                readIf("WITH");
                Expression start = readExpression();
                AlterSequence command = new AlterSequence(session, table.getSchema());
                command.setColumn(column);
                command.setStartWith(start);
                return command;
            } else if (readIf("SELECTIVITY")) {

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                            column.setNullable(false);
                        } else {
                            readIf("NULL");
                        }
                        if (readIf("CHECK")) {
                            Expression expr = readExpression();
                            column.addCheckConstraint(session, expr);
                        }
                        if (readIf("REFERENCES")) {
                            AlterTableAddConstraint ref = new AlterTableAddConstraint(session, schema, false);
                            ref.setConstraintName(constraintName);

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        for (Column nc : newColumns) {
            if (columnList.length() > 0) {
                columnList.append(", ");
            }
            if (type == CommandInterface.ALTER_TABLE_ADD_COLUMN && nc == newColumn) {
                Expression def = nc.getDefaultExpression();
                columnList.append(def == null ? "NULL" : def.getSQL());
            } else {
                columnList.append(nc.getSQL());
            }
        }
        buff.append(" AS SELECT ");

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        ArrayList<String> columns = New.arrayList();
        ArrayList<String> data = New.arrayList();
        JdbcConnection c = (JdbcConnection) conn;
        Session session = (Session) c.getSession();
        Parser p = new Parser(session);
        Expression expr = p.parseExpression(key);
        addColumnData(columns, data, expr);
        Object[] col = new Object[columns.size()];
        columns.toArray(col);
        Object[] dat = new Object[columns.size()];
        data.toArray(dat);

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    }


    private static void addColumnData(ArrayList<String> columns, ArrayList<String> data, Expression expr) {
        if (expr instanceof ConditionAndOr) {
            ConditionAndOr and = (ConditionAndOr) expr;
            Expression left = and.getExpression(true);
            Expression right = and.getExpression(false);
            addColumnData(columns, data, left);
            addColumnData(columns, data, right);
        } else {
            Comparison comp = (Comparison) expr;
            ExpressionColumn ec = (ExpressionColumn) comp.getExpression(true);

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Related Classes of expression.Expression

org.h2.command.ddl.AlterTableAlterColumn

org.h2.command.ddl.CreateTable

org.h2.command.dml.ExecuteProcedure

org.h2.command.dml.Insert

org.h2.command.dml.Merge

org.h2.command.dml.Query

org.h2.command.dml.Select

org.h2.command.dml.SelectListColumnResolver

org.h2.command.dml.SelectUnion

org.h2.command.dml.Set

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