13591799490

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Merge pull request #14 from torand/having-support

feat: supporting the HAVING clause + IS NULL operator now supports an…

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/src/main/java/io/github/torand/fastersql/statement/SelectStatement.java

/*
 * Copyright (c) 2024 Tore Eide Andersen
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.github.torand.fastersql.statement;

import io.github.torand.fastersql.Column;
import io.github.torand.fastersql.Context;
import io.github.torand.fastersql.Join;
import io.github.torand.fastersql.Table;
import io.github.torand.fastersql.alias.Alias;
import io.github.torand.fastersql.alias.ColumnAlias;
import io.github.torand.fastersql.expression.Expression;
import io.github.torand.fastersql.function.aggregate.AggregateFunction;
import io.github.torand.fastersql.order.Order;
import io.github.torand.fastersql.predicate.OptionalPredicate;
import io.github.torand.fastersql.predicate.Predicate;
import io.github.torand.fastersql.projection.Projection;
import io.github.torand.fastersql.subquery.Subquery;

import java.util.LinkedList;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.function.Supplier;
import java.util.stream.Stream;

import static io.github.torand.fastersql.Command.SELECT;
import static io.github.torand.fastersql.dialect.Capability.LIMIT_OFFSET;
import static io.github.torand.fastersql.statement.Helpers.unwrapSuppliers;
import static io.github.torand.fastersql.util.collection.CollectionHelper.asList;
import static io.github.torand.fastersql.util.collection.CollectionHelper.concat;
import static io.github.torand.fastersql.util.collection.CollectionHelper.isEmpty;
import static io.github.torand.fastersql.util.collection.CollectionHelper.nonEmpty;
import static io.github.torand.fastersql.util.collection.CollectionHelper.streamSafely;
import static io.github.torand.fastersql.util.contract.Requires.require;
import static io.github.torand.fastersql.util.contract.Requires.requireNonEmpty;
import static io.github.torand.fastersql.util.functional.Functions.castTo;
import static io.github.torand.fastersql.util.functional.Optionals.mapIfNonNull;
import static io.github.torand.fastersql.util.functional.Predicates.instanceOf;
import static io.github.torand.fastersql.util.lang.StringHelper.nonBlank;
import static java.util.Objects.isNull;
import static java.util.Objects.nonNull;
import static java.util.Objects.requireNonNull;
import static java.util.function.Predicate.not;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toSet;

public class SelectStatement extends PreparableStatement {
    private final List<Projection> projections;
    private final List<Table<?>> tables;
    private final List<Join> joins;
    private final Subquery subqueryFrom;
    private final List<Predicate> wherePredicates;
    private final List<Column> groups;
    private final List<Predicate> havingPredicates;
    private final List<Order> orders;
    private final boolean distinct;
    private final Long limit;
    private final Long offset;
    private final boolean forUpdate;

    SelectStatement(List<Projection> projections, List<Table<?>> tables, List<Join> joins, Subquery subqueryFrom, List<Predicate> wherePredicates, List<Column> groups, List<Predicate> havingPredicates, List<Order> orders, boolean distinct, Long limit, Long offset, boolean forUpdate) {
        this.projections = asList(projections);
        this.tables = asList(tables);
        this.joins = asList(joins);
        this.subqueryFrom = subqueryFrom;
        this.wherePredicates = asList(wherePredicates);
        this.groups = asList(groups);
        this.havingPredicates = asList(havingPredicates);
        this.orders = asList(orders);
        this.distinct = distinct;
        this.limit = limit;
        this.offset = offset;
        this.forUpdate = forUpdate;
    }

    public SelectStatement join(Join... joins) {
        requireNonEmpty(joins, "No joins specified");
        require(() -> isNull(subqueryFrom), "Can't combine a subquery FROM clause with joins");

        List<Join> concatenated = concat(this.joins, joins);
        return new SelectStatement(projections, tables, concatenated, subqueryFrom, wherePredicates, groups, havingPredicates, orders, distinct, limit, offset, forUpdate);
    }

    public SelectStatement leftOuterJoin(Join join) {
        requireNonNull(join, "No join specified");
        return join(join.leftOuter());
    }

    public SelectStatement rightOuterJoin(Join join) {
        requireNonNull(join, "No join specified");
        return join(join.rightOuter());
    }

    @SafeVarargs
    public final SelectStatement joinIf(boolean condition, Supplier<Join>... joinSuppliers) {
        requireNonEmpty(joinSuppliers, "No join suppliers specified");
        require(() -> isNull(subqueryFrom), "Can't combine a subquery FROM clause with joins");
        if (condition) {
            List<Join> concatenated = concat(this.joins, unwrapSuppliers(joinSuppliers));
            return new SelectStatement(projections, tables, concatenated, subqueryFrom, wherePredicates, groups, havingPredicates, orders, distinct, limit, offset, forUpdate);
        } else {
            return this;
        }
    }

    /**
     * Adds one or more predicates to the WHERE clause.
     * @param predicates the WHERE predicates to add
     * @return updated statement, for method chaining
     */
    public SelectStatement where(Predicate... predicates) {
        requireNonEmpty(predicates, "No WHERE predicates specified");

        List<Predicate> concatenated = concat(this.wherePredicates, predicates);
        return new SelectStatement(projections, tables, joins, subqueryFrom, concatenated, groups, havingPredicates, orders, distinct, limit, offset, forUpdate);
    }

    /**
     * Same as other method of same name, but only adds to the WHERE clause predicates that are present.
     * @param maybePredicates the WHERE predicate that may be present or not
     * @return updated statement, for method chaining
     */
    @SafeVarargs
    public final SelectStatement where(OptionalPredicate... maybePredicates) {
        requireNonEmpty(maybePredicates, "No optional WHERE predicates specified");

        List<Predicate> concatenated = concat(this.wherePredicates, OptionalPredicate.unwrap(maybePredicates));
        return new SelectStatement(projections, tables, joins, subqueryFrom, concatenated, groups, havingPredicates, orders, distinct, limit, offset, forUpdate);
    }

    /**
     * Adds one or more predicates to the WHERE clause, if a predicate is true.
     * @param condition the condition that must be true for predicates to be added
     * @param predicateSuppliers the suppliers providing WHERE predicates to add
     * @return updatet statement, for method chaining
     */
    @SafeVarargs
    public final SelectStatement whereIf(boolean condition, Supplier<Predicate>... predicateSuppliers) {
        requireNonEmpty(predicateSuppliers, "No WHERE predicate suppliers specified");
        if (condition) {
            List<Predicate> concatenated = concat(this.wherePredicates, unwrapSuppliers(predicateSuppliers));
            return new SelectStatement(projections, tables, joins, subqueryFrom, concatenated, groups, havingPredicates, orders, distinct, limit, offset, forUpdate);
        } else {
            return this;
        }
    }

    public SelectStatement groupBy(Column... groups) {
        requireNonEmpty(groups, "No groups specified");

        List<Column> concatenated = concat(this.groups, groups);
        return new SelectStatement(projections, tables, joins, subqueryFrom, wherePredicates, concatenated, havingPredicates, orders, distinct, limit, offset, forUpdate);
    }

    /**
     * Adds one or more predicates to the HAVING clause.
     * @param predicates the HAVING predicates to add
     * @return updated statement, for method chaining
     */
    public SelectStatement having(Predicate... predicates) {
        requireNonEmpty(predicates, "No HAVING predicates specified");

        List<Predicate> concatenated = concat(this.havingPredicates, predicates);
        return new SelectStatement(projections, tables, joins, subqueryFrom, wherePredicates, groups, concatenated, orders, distinct, limit, offset, forUpdate);
    }

    /**
     * Same as other method of same name, but only adds to the HAVING clause predicates that are present.
     * @param maybePredicates the HAVING predicate that may be present or not
     * @return updated statement, for method chaining
     */
    @SafeVarargs
    public final SelectStatement having(OptionalPredicate... maybePredicates) {
        requireNonEmpty(maybePredicates, "No optional HAVING predicates specified");

        List<Predicate> concatenated = concat(this.havingPredicates, OptionalPredicate.unwrap(maybePredicates));
        return new SelectStatement(projections, tables, joins, subqueryFrom, wherePredicates, groups, concatenated, orders, distinct, limit, offset, forUpdate);
    }

    /**
     * Adds one or more predicates to the HAVING clause, if a predicate is true.
     * @param condition the condition that must be true for predicates to be added
     * @param predicateSuppliers the suppliers providing HAVING predicates to add
     * @return updatet statement, for method chaining
     */
    @SafeVarargs
    public final SelectStatement havingIf(boolean condition, Supplier<Predicate>... predicateSuppliers) {
        requireNonEmpty(predicateSuppliers, "No HAVING predicate suppliers specified");
        if (condition) {
            List<Predicate> concatenated = concat(this.havingPredicates, unwrapSuppliers(predicateSuppliers));
            return new SelectStatement(projections, tables, joins, subqueryFrom, wherePredicates, groups, concatenated, orders, distinct, limit, offset, forUpdate);
        } else {
            return this;
        }
    }

    public SelectStatement orderBy(Order... orders) {
        requireNonEmpty(orders, "No orders specified");

        List<Order> concatenated = concat(this.orders, orders);
        return new SelectStatement(projections, tables, joins, subqueryFrom, wherePredicates, groups, havingPredicates, concatenated, distinct, limit, offset, forUpdate);
    }

    public SelectStatement limit(long limit) {
        return new SelectStatement(projections, tables, joins, subqueryFrom, wherePredicates, groups, havingPredicates, orders, distinct, limit, offset, forUpdate);
    }

    public SelectStatement offset(long offset) {
        return new SelectStatement(projections, tables, joins, subqueryFrom, wherePredicates, groups, havingPredicates, orders, distinct, limit, offset, forUpdate);
    }

    public SelectStatement forUpdate() {
        return new SelectStatement(projections, tables, joins, subqueryFrom, wherePredicates, groups, havingPredicates, orders, distinct, limit, offset, true);
    }

    @Override
    public String sql(Context context) {
        final Context localContext = context.withCommand(SELECT);
        validate();

        StringBuilder sb = new StringBuilder();
        sb.append("select ");
        if (distinct) {
            sb.append("distinct ");
        }

        sb.append(streamSafely(projections)
            .map(p -> p.sql(localContext) + (p.alias().isEmpty() ? "" : " " + p.alias().map(a -> a.sql(localContext)).get()))
            .collect(joining(", ")));

        sb.append(" from ");

        if (nonNull(subqueryFrom)) {
            sb.append(subqueryFrom.sql(context));
            if (nonBlank(subqueryFrom.alias())) {
                sb.append(" ");
                sb.append(subqueryFrom.alias());
            }
        } else {
            // Tables that are joined with should not be specified in the FROM clause
            Set<Table<?>> joinedTables = streamSafely(joins).map(Join::joined).collect(toSet());

            sb.append(streamSafely(tables)
                .filter(not(joinedTables::contains))
                .map(t -> t.sql(localContext))
                .collect(joining(", ")));

            if (nonEmpty(joins)) {
                sb.append(" ");
                sb.append(streamSafely(joins)
                    .map(j -> j.sql(localContext))
                    .collect(joining(" ")));
            }
        }

        if (nonEmpty(wherePredicates)) {
            sb.append(" where ");
            sb.append(streamSafely(wherePredicates)
                .map(p -> p.sql(localContext))
                .collect(joining(" and ")));
        }

        if (nonEmpty(groups)) {
            sb.append(" group by ");
            sb.append(streamSafely(groups)
                .map(g -> g.sql(localContext))
                .collect(joining(", ")));
        }

        if (nonEmpty(havingPredicates)) {
            sb.append(" having ");
            sb.append(streamSafely(havingPredicates)
                .map(p -> p.sql(localContext))
                .collect(joining(" and ")));
        }

        if (nonEmpty(orders)) {
            sb.append(" order by ");
            sb.append(streamSafely(orders)
                .map(o -> o.sql(localContext))
                .collect(joining(", ")));
        }

        if (nonNull(offset) || nonNull(limit)) {
            if (context.getDialect().supports(LIMIT_OFFSET)) {
                String offsetClause = nonNull(offset) ? " " + context.getDialect().formatRowOffsetClause().orElseThrow(() -> new RuntimeException("Dialect " + context.getDialect().getProductName() + " has no row offset clause")) : "";
                String limitClause = nonNull(limit) ? " " + context.getDialect().formatRowLimitClause().orElseThrow(() -> new RuntimeException("Dialect " + context.getDialect().getProductName() + " has no row limit clause")) : "";

                if (context.getDialect().offsetBeforeLimit()) {
                    sb.append(offsetClause).append(limitClause);
                } else {
                    sb.append(limitClause).append(offsetClause);
                }
            } else {
                sb = addLimitOffsetFallback(context, sb, rowFrom(), rowTo());
            }
        }

        if (forUpdate) {
            sb.append(" for update");
        }

        return sb.toString();
    }

    private Long rowFrom() {
        return mapIfNonNull(offset, o -> o + 1);
    }

    private Long rowTo() {
        return mapIfNonNull(limit, l -> (nonNull(offset) ? offset : 0) + l);
    }

    private StringBuilder addLimitOffsetFallback(Context context, StringBuilder innerSql, Long rowFrom, Long rowTo) {
        String rowNum = context.getDialect().formatRowNumLiteral()
            .orElseThrow(() -> new RuntimeException("Dialect " + context.getDialect().getProductName() + " has no row number literal"));

        if (nonNull(rowFrom) && nonNull(rowTo)) {
            String limitSql = "select ORIGINAL.*, {ROWNUM} ROW_NO from ( " + innerSql.toString() + " ) ORIGINAL where {ROWNUM} <= ?";
            String offsetSql = "select * from ( " + limitSql + " ) where ROW_NO >= ?";
            return new StringBuilder(offsetSql.replace("{ROWNUM}", rowNum));
        } else if (nonNull(rowFrom)) {
            String offsetSql = "select * from ( " + innerSql.toString() + " ) where {ROWNUM} >= ?";
            return new StringBuilder(offsetSql.replace("{ROWNUM}", rowNum));
        } else if (nonNull(rowTo)) {
            String limitSql = "select * from ( " + innerSql.toString() + " ) where {ROWNUM} <= ?";
            return new StringBuilder(limitSql.replace("{ROWNUM}", rowNum));
        }

        return innerSql;
    }

    @Override
    public List<Object> params(Context context) {
        List<Object> params = new LinkedList<>();

        streamSafely(projections).flatMap(p -> p.params(context)).forEach(params::add);

        if (nonNull(subqueryFrom)) {
            subqueryFrom.params(context).forEach(params::add);
        }

        streamSafely(wherePredicates).flatMap(p -> p.params(context)).forEach(params::add);

        streamSafely(havingPredicates).flatMap(p -> p.params(context)).forEach(params::add);

        if (context.getDialect().supports(LIMIT_OFFSET)) {
            if (context.getDialect().offsetBeforeLimit()) {
                if (nonNull(offset)) {
                    params.add(offset);
                }
                if (nonNull(limit)) {
                    params.add(limit);
                }
            } else {
                if (nonNull(limit)) {
                    params.add(limit);
                }
                if (nonNull(offset)) {
                    params.add(offset);
                }
            }
        } else {
            if (nonNull(limit)) {
                params.add(rowTo());
            }
            if (nonNull(offset)) {
                params.add(rowFrom());
            }
        }

        return params;
    }

    private void validate() {
        if (isEmpty(tables) && isNull(subqueryFrom)) {
            throw new IllegalStateException("No FROM clause specified");
        }

        Stream<Column> projectedColumns = streamSafely(projections)
            .filter(instanceOf(Expression.class))
            .map(castTo(Expression.class))
            .flatMap(Expression::columnRefs);
        validateColumnTableRelations(projectedColumns);

        if (nonNull(joins)) {
            validateColumnTableRelations(streamSafely(joins).flatMap(Join::columnRefs));
        }

        if (nonNull(orders)) {
            Set<String> orderableAliases = streamSafely(projections)
                .map(Projection::alias)
                .flatMap(Optional::stream)
                .map(Alias::name)
                .collect(toSet());

            streamSafely(orders)
                .flatMap(o -> o.aliasRefs())
                .map(ColumnAlias::name)
                .filter(a -> !orderableAliases.contains(a))
                .findFirst()
                .ifPresent(a -> {
                    throw new IllegalStateException("ORDER BY column alias " + a + " is not specified in the SELECT clause");
                });
        }

        validateColumnTableRelations(streamSafely(wherePredicates).flatMap(Predicate::columnRefs));
        validateColumnTableRelations(streamSafely(groups));
        validateColumnTableRelations(streamSafely(havingPredicates).flatMap(Predicate::columnRefs));
        validateColumnTableRelations(streamSafely(orders).flatMap(Order::columnRefs));

        if (forUpdate) {
            if (distinct || nonEmpty(groups) || streamSafely(projections).anyMatch(instanceOf(AggregateFunction.class))) {
                throw new IllegalStateException("SELECT ... FOR UPDATE can't be used with DISTINCT, GROUP BY or aggregates");
            }
        }
    }

    private void validateColumnTableRelations(Stream<Column> columns) {
        Set<String> tableNames = Stream.concat(streamSafely(tables), streamSafely(joins).map(Join::joined))
            .map(Table::name)
            .collect(toSet());

        columns
            .filter(c -> !tableNames.contains(c.table().name()))
            .findFirst()
            .ifPresent(c -> {
                throw new IllegalStateException("Column " + c.name() + " belongs to table " + c.table().name() + ", but is not specified in a FROM or JOIN clause");
            });
    }
}

1	/*
2	* Copyright (c) 2024 Tore Eide Andersen
3	*
4	* Licensed under the Apache License, Version 2.0 (the "License");
5	* you may not use this file except in compliance with the License.
6	* You may obtain a copy of the License at
7	*
8	* http://www.apache.org/licenses/LICENSE-2.0
9	*
10	* Unless required by applicable law or agreed to in writing, software
11	* distributed under the License is distributed on an "AS IS" BASIS,
12	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13	* See the License for the specific language governing permissions and
14	* limitations under the License.
15	*/
16	package io.github.torand.fastersql.statement;
17
18	import io.github.torand.fastersql.Column;
19	import io.github.torand.fastersql.Context;
20	import io.github.torand.fastersql.Join;
21	import io.github.torand.fastersql.Table;
22	import io.github.torand.fastersql.alias.Alias;
23	import io.github.torand.fastersql.alias.ColumnAlias;
24	import io.github.torand.fastersql.expression.Expression;
25	import io.github.torand.fastersql.function.aggregate.AggregateFunction;
26	import io.github.torand.fastersql.order.Order;
27	import io.github.torand.fastersql.predicate.OptionalPredicate;
28	import io.github.torand.fastersql.predicate.Predicate;
29	import io.github.torand.fastersql.projection.Projection;
30	import io.github.torand.fastersql.subquery.Subquery;
31
32	import java.util.LinkedList;
33	import java.util.List;
34	import java.util.Optional;
35	import java.util.Set;
36	import java.util.function.Supplier;
37	import java.util.stream.Stream;
38
39	import static io.github.torand.fastersql.Command.SELECT;
40	import static io.github.torand.fastersql.dialect.Capability.LIMIT_OFFSET;
41	import static io.github.torand.fastersql.statement.Helpers.unwrapSuppliers;
42	import static io.github.torand.fastersql.util.collection.CollectionHelper.asList;
43	import static io.github.torand.fastersql.util.collection.CollectionHelper.concat;
44	import static io.github.torand.fastersql.util.collection.CollectionHelper.isEmpty;
45	import static io.github.torand.fastersql.util.collection.CollectionHelper.nonEmpty;
46	import static io.github.torand.fastersql.util.collection.CollectionHelper.streamSafely;
47	import static io.github.torand.fastersql.util.contract.Requires.require;
48	import static io.github.torand.fastersql.util.contract.Requires.requireNonEmpty;
49	import static io.github.torand.fastersql.util.functional.Functions.castTo;
50	import static io.github.torand.fastersql.util.functional.Optionals.mapIfNonNull;
51	import static io.github.torand.fastersql.util.functional.Predicates.instanceOf;
52	import static io.github.torand.fastersql.util.lang.StringHelper.nonBlank;
53	import static java.util.Objects.isNull;
54	import static java.util.Objects.nonNull;
55	import static java.util.Objects.requireNonNull;
56	import static java.util.function.Predicate.not;
57	import static java.util.stream.Collectors.joining;
58	import static java.util.stream.Collectors.toSet;
59
60	public class SelectStatement extends PreparableStatement {
61	private final List<Projection> projections;
62	private final List<Table<?>> tables;
63	private final List<Join> joins;
64	private final Subquery subqueryFrom;
65	private final List<Predicate> wherePredicates;
66	private final List<Column> groups;
67	private final List<Predicate> havingPredicates;
68	private final List<Order> orders;
69	private final boolean distinct;
70	private final Long limit;
71	private final Long offset;
72	private final boolean forUpdate;
73
74	SelectStatement(List<Projection> projections, List<Table<?>> tables, List<Join> joins, Subquery subqueryFrom, List<Predicate> wherePredicates, List<Column> groups, List<Predicate> havingPredicates, List<Order> orders, boolean distinct, Long limit, Long offset, boolean forUpdate) {	2✔
75	this.projections = asList(projections);	4✔
76	this.tables = asList(tables);	4✔
77	this.joins = asList(joins);	4✔
78	this.subqueryFrom = subqueryFrom;	3✔
79	this.wherePredicates = asList(wherePredicates);	4✔
80	this.groups = asList(groups);	4✔
81	this.havingPredicates = asList(havingPredicates);	4✔
82	this.orders = asList(orders);	4✔
83	this.distinct = distinct;	3✔
84	this.limit = limit;	3✔
85	this.offset = offset;	3✔
86	this.forUpdate = forUpdate;	3✔
87	}	1✔
88
89	public SelectStatement join(Join... joins) {
90	requireNonEmpty(joins, "No joins specified");	6✔
91	require(() -> isNull(subqueryFrom), "Can't combine a subquery FROM clause with joins");	10✔
92
93	List<Join> concatenated = concat(this.joins, joins);	5✔
94	return new SelectStatement(projections, tables, concatenated, subqueryFrom, wherePredicates, groups, havingPredicates, orders, distinct, limit, offset, forUpdate);	27✔
95	}
96
97	public SelectStatement leftOuterJoin(Join join) {
98	requireNonNull(join, "No join specified");	×
99	return join(join.leftOuter());	×
100	}
101
102	public SelectStatement rightOuterJoin(Join join) {
103	requireNonNull(join, "No join specified");	×
104	return join(join.rightOuter());	×
105	}
106
107	@SafeVarargs
108	public final SelectStatement joinIf(boolean condition, Supplier<Join>... joinSuppliers) {
109	requireNonEmpty(joinSuppliers, "No join suppliers specified");	×
110	require(() -> isNull(subqueryFrom), "Can't combine a subquery FROM clause with joins");	×
111	if (condition) {	×
112	List<Join> concatenated = concat(this.joins, unwrapSuppliers(joinSuppliers));	×
NEW 113	return new SelectStatement(projections, tables, concatenated, subqueryFrom, wherePredicates, groups, havingPredicates, orders, distinct, limit, offset, forUpdate);	×
114	} else {
115	return this;	×
116	}
117	}
118
119	/**
120	* Adds one or more predicates to the WHERE clause.
121	* @param predicates the WHERE predicates to add
122	* @return updated statement, for method chaining
123	*/
124	public SelectStatement where(Predicate... predicates) {
125	requireNonEmpty(predicates, "No WHERE predicates specified");	6✔
126
127	List<Predicate> concatenated = concat(this.wherePredicates, predicates);	5✔
128	return new SelectStatement(projections, tables, joins, subqueryFrom, concatenated, groups, havingPredicates, orders, distinct, limit, offset, forUpdate);	27✔
129	}
130
131	/**
132	* Same as other method of same name, but only adds to the WHERE clause predicates that are present.
133	* @param maybePredicates the WHERE predicate that may be present or not
134	* @return updated statement, for method chaining
135	*/
136	@SafeVarargs
137	public final SelectStatement where(OptionalPredicate... maybePredicates) {
138	requireNonEmpty(maybePredicates, "No optional WHERE predicates specified");	6✔
139
140	List<Predicate> concatenated = concat(this.wherePredicates, OptionalPredicate.unwrap(maybePredicates));	6✔
141	return new SelectStatement(projections, tables, joins, subqueryFrom, concatenated, groups, havingPredicates, orders, distinct, limit, offset, forUpdate);	27✔
142	}
143
144	/**
145	* Adds one or more predicates to the WHERE clause, if a predicate is true.
146	* @param condition the condition that must be true for predicates to be added
147	* @param predicateSuppliers the suppliers providing WHERE predicates to add
148	* @return updatet statement, for method chaining
149	*/
150	@SafeVarargs
151	public final SelectStatement whereIf(boolean condition, Supplier<Predicate>... predicateSuppliers) {
NEW 152	requireNonEmpty(predicateSuppliers, "No WHERE predicate suppliers specified");	×
153	if (condition) {	×
NEW 154	List<Predicate> concatenated = concat(this.wherePredicates, unwrapSuppliers(predicateSuppliers));	×
NEW 155	return new SelectStatement(projections, tables, joins, subqueryFrom, concatenated, groups, havingPredicates, orders, distinct, limit, offset, forUpdate);	×
156	} else {
157	return this;	×
158	}
159	}
160
161	public SelectStatement groupBy(Column... groups) {
162	requireNonEmpty(groups, "No groups specified");	6✔
163
164	List<Column> concatenated = concat(this.groups, groups);	5✔
165	return new SelectStatement(projections, tables, joins, subqueryFrom, wherePredicates, concatenated, havingPredicates, orders, distinct, limit, offset, forUpdate);	27✔
166	}
167
168	/**
169	* Adds one or more predicates to the HAVING clause.
170	* @param predicates the HAVING predicates to add
171	* @return updated statement, for method chaining
172	*/
173	public SelectStatement having(Predicate... predicates) {
174	requireNonEmpty(predicates, "No HAVING predicates specified");	6✔
175
176	List<Predicate> concatenated = concat(this.havingPredicates, predicates);	5✔
177	return new SelectStatement(projections, tables, joins, subqueryFrom, wherePredicates, groups, concatenated, orders, distinct, limit, offset, forUpdate);	27✔
178	}
179
180	/**
181	* Same as other method of same name, but only adds to the HAVING clause predicates that are present.
182	* @param maybePredicates the HAVING predicate that may be present or not
183	* @return updated statement, for method chaining
184	*/
185	@SafeVarargs
186	public final SelectStatement having(OptionalPredicate... maybePredicates) {
NEW 187	requireNonEmpty(maybePredicates, "No optional HAVING predicates specified");	×
188
NEW 189	List<Predicate> concatenated = concat(this.havingPredicates, OptionalPredicate.unwrap(maybePredicates));	×
NEW 190	return new SelectStatement(projections, tables, joins, subqueryFrom, wherePredicates, groups, concatenated, orders, distinct, limit, offset, forUpdate);	×
191	}
192
193	/**
194	* Adds one or more predicates to the HAVING clause, if a predicate is true.
195	* @param condition the condition that must be true for predicates to be added
196	* @param predicateSuppliers the suppliers providing HAVING predicates to add
197	* @return updatet statement, for method chaining
198	*/
199	@SafeVarargs
200	public final SelectStatement havingIf(boolean condition, Supplier<Predicate>... predicateSuppliers) {
NEW 201	requireNonEmpty(predicateSuppliers, "No HAVING predicate suppliers specified");	×
NEW 202	if (condition) {	×
NEW 203	List<Predicate> concatenated = concat(this.havingPredicates, unwrapSuppliers(predicateSuppliers));	×
NEW 204	return new SelectStatement(projections, tables, joins, subqueryFrom, wherePredicates, groups, concatenated, orders, distinct, limit, offset, forUpdate);	×
205	} else {
NEW 206	return this;	×
207	}
208	}
209
210	public SelectStatement orderBy(Order... orders) {
211	requireNonEmpty(orders, "No orders specified");	6✔
212
213	List<Order> concatenated = concat(this.orders, orders);	5✔
214	return new SelectStatement(projections, tables, joins, subqueryFrom, wherePredicates, groups, havingPredicates, concatenated, distinct, limit, offset, forUpdate);	27✔
215	}
216
217	public SelectStatement limit(long limit) {
218	return new SelectStatement(projections, tables, joins, subqueryFrom, wherePredicates, groups, havingPredicates, orders, distinct, limit, offset, forUpdate);	28✔
219	}
220
221	public SelectStatement offset(long offset) {
222	return new SelectStatement(projections, tables, joins, subqueryFrom, wherePredicates, groups, havingPredicates, orders, distinct, limit, offset, forUpdate);	28✔
223	}
224
225	public SelectStatement forUpdate() {
226	return new SelectStatement(projections, tables, joins, subqueryFrom, wherePredicates, groups, havingPredicates, orders, distinct, limit, offset, true);	27✔
227	}
228
229	@Override
230	public String sql(Context context) {
231	final Context localContext = context.withCommand(SELECT);	4✔
232	validate();	2✔
233
234	StringBuilder sb = new StringBuilder();	4✔
235	sb.append("select ");	4✔
236	if (distinct) {	3✔
237	sb.append("distinct ");	4✔
238	}
239
240	sb.append(streamSafely(projections)	8✔
241	.map(p -> p.sql(localContext) + (p.alias().isEmpty() ? "" : " " + p.alias().map(a -> a.sql(localContext)).get()))	25✔
242	.collect(joining(", ")));	3✔
243
244	sb.append(" from ");	4✔
245
246	if (nonNull(subqueryFrom)) {	4✔
247	sb.append(subqueryFrom.sql(context));	7✔
248	if (nonBlank(subqueryFrom.alias())) {	5!
249	sb.append(" ");	4✔
250	sb.append(subqueryFrom.alias());	7✔
251	}
252	} else {
253	// Tables that are joined with should not be specified in the FROM clause
254	Set<Table<?>> joinedTables = streamSafely(joins).map(Join::joined).collect(toSet());	9✔
255
256	sb.append(streamSafely(tables)	8✔
257	.filter(not(joinedTables::contains))	7✔
258	.map(t -> t.sql(localContext))	6✔
259	.collect(joining(", ")));	3✔
260
261	if (nonEmpty(joins)) {	4✔
262	sb.append(" ");	4✔
263	sb.append(streamSafely(joins)	8✔
264	.map(j -> j.sql(localContext))	6✔
265	.collect(joining(" ")));	3✔
266	}
267	}
268
269	if (nonEmpty(wherePredicates)) {	4✔
270	sb.append(" where ");	4✔
271	sb.append(streamSafely(wherePredicates)	8✔
272	.map(p -> p.sql(localContext))	6✔
273	.collect(joining(" and ")));	3✔
274	}
275
276	if (nonEmpty(groups)) {	4✔
277	sb.append(" group by ");	4✔
278	sb.append(streamSafely(groups)	8✔
279	.map(g -> g.sql(localContext))	6✔
280	.collect(joining(", ")));	3✔
281	}
282
283	if (nonEmpty(havingPredicates)) {	4✔
284	sb.append(" having ");	4✔
285	sb.append(streamSafely(havingPredicates)	8✔
286	.map(p -> p.sql(localContext))	6✔
287	.collect(joining(" and ")));	3✔
288	}
289
290	if (nonEmpty(orders)) {	4✔
291	sb.append(" order by ");	4✔
292	sb.append(streamSafely(orders)	8✔
293	.map(o -> o.sql(localContext))	6✔
294	.collect(joining(", ")));	3✔
295	}
296
297	if (nonNull(offset) \|\| nonNull(limit)) {	8!
298	if (context.getDialect().supports(LIMIT_OFFSET)) {	5✔
299	String offsetClause = nonNull(offset) ? " " + context.getDialect().formatRowOffsetClause().orElseThrow(() -> new RuntimeException("Dialect " + context.getDialect().getProductName() + " has no row offset clause")) : "";	14!
300	String limitClause = nonNull(limit) ? " " + context.getDialect().formatRowLimitClause().orElseThrow(() -> new RuntimeException("Dialect " + context.getDialect().getProductName() + " has no row limit clause")) : "";	14!
301
302	if (context.getDialect().offsetBeforeLimit()) {	4✔
303	sb.append(offsetClause).append(limitClause);	7✔
304	} else {
305	sb.append(limitClause).append(offsetClause);	6✔
306	}
307	} else {	1✔
308	sb = addLimitOffsetFallback(context, sb, rowFrom(), rowTo());	9✔
309	}
310	}
311
312	if (forUpdate) {	3✔
313	sb.append(" for update");	4✔
314	}
315
316	return sb.toString();	3✔
317	}
318
319	private Long rowFrom() {
320	return mapIfNonNull(offset, o -> o + 1);	12✔
321	}
322
323	private Long rowTo() {
324	return mapIfNonNull(limit, l -> (nonNull(offset) ? offset : 0) + l);	20!
325	}
326
327	private StringBuilder addLimitOffsetFallback(Context context, StringBuilder innerSql, Long rowFrom, Long rowTo) {
328	String rowNum = context.getDialect().formatRowNumLiteral()	5✔
329	.orElseThrow(() -> new RuntimeException("Dialect " + context.getDialect().getProductName() + " has no row number literal"));	3✔
330
331	if (nonNull(rowFrom) && nonNull(rowTo)) {	6!
332	String limitSql = "select ORIGINAL.*, {ROWNUM} ROW_NO from ( " + innerSql.toString() + " ) ORIGINAL where {ROWNUM} <= ?";	4✔
333	String offsetSql = "select * from ( " + limitSql + " ) where ROW_NO >= ?";	3✔
334	return new StringBuilder(offsetSql.replace("{ROWNUM}", rowNum));	8✔
335	} else if (nonNull(rowFrom)) {	×
336	String offsetSql = "select * from ( " + innerSql.toString() + " ) where {ROWNUM} >= ?";	×
337	return new StringBuilder(offsetSql.replace("{ROWNUM}", rowNum));	×
338	} else if (nonNull(rowTo)) {	×
339	String limitSql = "select * from ( " + innerSql.toString() + " ) where {ROWNUM} <= ?";	×
340	return new StringBuilder(limitSql.replace("{ROWNUM}", rowNum));	×
341	}
342
343	return innerSql;	×
344	}
345
346	@Override
347	public List<Object> params(Context context) {
348	List<Object> params = new LinkedList<>();	4✔
349
350	streamSafely(projections).flatMap(p -> p.params(context)).forEach(params::add);	16✔
351
352	if (nonNull(subqueryFrom)) {	4✔
353	subqueryFrom.params(context).forEach(params::add);	10✔
354	}
355
356	streamSafely(wherePredicates).flatMap(p -> p.params(context)).forEach(params::add);	16✔
357
358	streamSafely(havingPredicates).flatMap(p -> p.params(context)).forEach(params::add);	16✔
359
360	if (context.getDialect().supports(LIMIT_OFFSET)) {	5✔
361	if (context.getDialect().offsetBeforeLimit()) {	4✔
362	if (nonNull(offset)) {	4✔
363	params.add(offset);	5✔
364	}
365	if (nonNull(limit)) {	4✔
366	params.add(limit);	6✔
367	}
368	} else {
369	if (nonNull(limit)) {	4✔
370	params.add(limit);	5✔
371	}
372	if (nonNull(offset)) {	4✔
373	params.add(offset);	6✔
374	}
375	}
376	} else {
377	if (nonNull(limit)) {	4!
378	params.add(rowTo());	5✔
379	}
380	if (nonNull(offset)) {	4!
381	params.add(rowFrom());	5✔
382	}
383	}
384
385	return params;	2✔
386	}
387
388	private void validate() {
389	if (isEmpty(tables) && isNull(subqueryFrom)) {	8!
390	throw new IllegalStateException("No FROM clause specified");	×
391	}
392
393	Stream<Column> projectedColumns = streamSafely(projections)	4✔
394	.filter(instanceOf(Expression.class))	3✔
395	.map(castTo(Expression.class))	3✔
396	.flatMap(Expression::columnRefs);	2✔
397	validateColumnTableRelations(projectedColumns);	3✔
398
399	if (nonNull(joins)) {	4!
400	validateColumnTableRelations(streamSafely(joins).flatMap(Join::columnRefs));	7✔
401	}
402
403	if (nonNull(orders)) {	4!
404	Set<String> orderableAliases = streamSafely(projections)	4✔
405	.map(Projection::alias)	2✔
406	.flatMap(Optional::stream)	2✔
407	.map(Alias::name)	1✔
408	.collect(toSet());	4✔
409
410	streamSafely(orders)	4✔
411	.flatMap(o -> o.aliasRefs())	5✔
412	.map(ColumnAlias::name)	3✔
413	.filter(a -> !orderableAliases.contains(a))	7!
414	.findFirst()	2✔
415	.ifPresent(a -> {	1✔
NEW 416	throw new IllegalStateException("ORDER BY column alias " + a + " is not specified in the SELECT clause");	×
417	});
418	}
419
420	validateColumnTableRelations(streamSafely(wherePredicates).flatMap(Predicate::columnRefs));	7✔
421	validateColumnTableRelations(streamSafely(groups));	5✔
422	validateColumnTableRelations(streamSafely(havingPredicates).flatMap(Predicate::columnRefs));	7✔
423	validateColumnTableRelations(streamSafely(orders).flatMap(Order::columnRefs));	7✔
424
425	if (forUpdate) {	3✔
426	if (distinct \|\| nonEmpty(groups) \|\| streamSafely(projections).anyMatch(instanceOf(AggregateFunction.class))) {	14!
427	throw new IllegalStateException("SELECT ... FOR UPDATE can't be used with DISTINCT, GROUP BY or aggregates");	×
428	}
429	}
430	}	1✔
431
432	private void validateColumnTableRelations(Stream<Column> columns) {
433	Set<String> tableNames = Stream.concat(streamSafely(tables), streamSafely(joins).map(Join::joined))	10✔
434	.map(Table::name)	1✔
435	.collect(toSet());	4✔
436
437	columns	3✔
438	.filter(c -> !tableNames.contains(c.table().name()))	9!
439	.findFirst()	2✔
440	.ifPresent(c -> {	1✔
NEW 441	throw new IllegalStateException("Column " + c.name() + " belongs to table " + c.table().name() + ", but is not specified in a FROM or JOIN clause");	×
442	});
443	}	1✔
444	}

torand / FasterSQL / 13591799490

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