Examples with Expression io.requery.query.Expression used on opensource projects

Example 11 with Expression

use of io.requery.query.Expression in project requery by requery.

the class UpdateGenerator method write.

@Override
public void write(final Output output, Map<Expression<?>, Object> values) {
    QueryBuilder qb = output.builder();
    qb.keyword(UPDATE);
    output.appendTables();
    qb.keyword(SET);
    int index = 0;
    for (Map.Entry<Expression<?>, Object> entry : values.entrySet()) {
        if (index > 0) {
            qb.append(",");
        }
        output.appendColumn(entry.getKey());
        output.appendOperator(Operator.EQUAL);
        output.appendConditionValue(entry.getKey(), entry.getValue());
        index++;
    }
}

Example 12 with Expression

use of io.requery.query.Expression in project requery by requery.

the class UpsertMergeGenerator method appendUsing.

protected void appendUsing(final Output writer, final Map<Expression<?>, Object> values) {
    QueryBuilder qb = writer.builder();
    qb.openParenthesis().keyword(VALUES).openParenthesis().commaSeparated(values.keySet(), new QueryBuilder.Appender<Expression>() {

        @Override
        public void append(QueryBuilder qb, Expression expression) {
            qb.append("?");
            writer.parameters().add(expression, values.get(expression));
        }
    }).closeParenthesis().closeParenthesis().space().keyword(AS).append(alias).openParenthesis().commaSeparatedExpressions(values.keySet()).closeParenthesis().space();
}

Example 13 with Expression

use of io.requery.query.Expression in project requery by requery.

the class UpsertMergeGenerator method write.

@Override
public void write(Output output, Map<Expression<?>, Object> values) {
    QueryBuilder qb = output.builder();
    // TODO only supporting 1 type for now
    Type<?> type = null;
    for (Expression<?> expression : values.keySet()) {
        if (expression.getExpressionType() == ExpressionType.ATTRIBUTE) {
            Attribute attribute = (Attribute) expression;
            type = attribute.getDeclaringType();
            break;
        }
    }
    if (type == null) {
        throw new IllegalStateException();
    }
    qb.keyword(MERGE).keyword(INTO).tableName(type.getName()).keyword(USING);
    appendUsing(output, values);
    qb.keyword(ON).openParenthesis();
    int count = 0;
    Set<? extends Attribute<?, ?>> attributes = type.getKeyAttributes();
    if (attributes.isEmpty()) {
        attributes = type.getAttributes();
    }
    for (Attribute<?, ?> attribute : attributes) {
        if (count > 0) {
            qb.keyword(Keyword.AND);
        }
        qb.aliasAttribute(type.getName(), attribute);
        qb.append(" = ");
        qb.aliasAttribute(alias, attribute);
        count++;
    }
    qb.closeParenthesis().space();
    // update fragment
    LinkedHashSet<Attribute<?, ?>> updates = new LinkedHashSet<>();
    for (Expression<?> expression : values.keySet()) {
        if (expression.getExpressionType() == ExpressionType.ATTRIBUTE) {
            Attribute attribute = (Attribute) expression;
            if (!attribute.isKey()) {
                updates.add(attribute);
            }
        }
    }
    qb.keyword(WHEN, MATCHED, THEN, UPDATE, SET).commaSeparated(updates, new QueryBuilder.Appender<Attribute<?, ?>>() {

        @Override
        public void append(QueryBuilder qb, Attribute<?, ?> value) {
            qb.attribute(value);
            qb.append(" = " + alias + "." + value.getName());
        }
    }).space();
    // insert fragment
    qb.keyword(WHEN, NOT, MATCHED, THEN, INSERT).openParenthesis().commaSeparatedExpressions(values.keySet()).closeParenthesis().space().keyword(VALUES).openParenthesis().commaSeparated(values.keySet(), new QueryBuilder.Appender<Expression<?>>() {

        @Override
        public void append(QueryBuilder qb, Expression<?> value) {
            qb.aliasAttribute(alias, (Attribute) value);
        }
    }).closeParenthesis();
}

Example 14 with Expression

use of io.requery.query.Expression in project requery by requery.

the class DefaultOutput method appendOperation.

private void appendOperation(Condition condition, int depth) {
    Object leftOperand = condition.getLeftOperand();
    if (leftOperand instanceof Expression) {
        final Expression<?> expression = (Expression<?>) condition.getLeftOperand();
        appendColumn(expression);
        Object value = condition.getRightOperand();
        appendOperator(condition.getOperator());
        if (value instanceof Collection && (condition.getOperator() == Operator.IN || condition.getOperator() == Operator.NOT_IN)) {
            Collection collection = (Collection) value;
            qb.openParenthesis();
            qb.commaSeparated(collection, new QueryBuilder.Appender() {

                @Override
                public void append(QueryBuilder qb, Object value) {
                    appendConditionValue(expression, value);
                }
            });
            qb.closeParenthesis();
        } else if (value instanceof Object[]) {
            Object[] values = (Object[]) value;
            if (condition.getOperator() == Operator.BETWEEN) {
                Object begin = values[0];
                Object end = values[1];
                appendConditionValue(expression, begin);
                qb.keyword(AND);
                appendConditionValue(expression, end);
            } else {
                for (Object o : values) {
                    appendConditionValue(expression, o);
                }
            }
        } else if (value instanceof QueryWrapper) {
            QueryWrapper wrapper = (QueryWrapper) value;
            qb.openParenthesis();
            appendQuery(wrapper);
            qb.closeParenthesis().space();
        } else if (value instanceof Condition) {
            appendOperation((Condition) value, depth + 1);
        } else if (value != null) {
            appendConditionValue(expression, value);
        }
    } else if (leftOperand instanceof Condition) {
        if (depth > 0) {
            qb.openParenthesis();
        }
        appendOperation((Condition) leftOperand, depth + 1);
        appendOperator(condition.getOperator());
        Object value = condition.getRightOperand();
        if (value instanceof Condition) {
            appendOperation((Condition) value, depth + 1);
        } else {
            throw new IllegalStateException();
        }
        if (depth > 0) {
            qb.closeParenthesis().space();
        }
    } else {
        throw new IllegalStateException("unknown start expression type " + leftOperand);
    }
}