15294773771

Committed 28 May 2025 08:01AM UTC coverage: 70.078% (+0.2%) from 69.877%

Build # 15294773771

Build Type

Pull #31

github

Committed by

web-flow

Commit Message

Merge 9f1c324c0 into 6be86da23

Pull Request Pull Request #31: feat: add support for SQLite dialect

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233 of 418 branches covered (55.74%)

Branch coverage included in aggregate %.

28 of 33 new or added lines in 12 files covered. (84.85%)

45 existing lines in 10 files now uncovered.

1212 of 1644 relevant lines covered (73.72%)

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79.17

/src/main/java/io/github/torand/fastersql/dialect/H2Dialect.java

/*
 * Copyright (c) 2024-2025 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.dialect;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.EnumSet;
import java.util.List;
import java.util.Optional;

import static io.github.torand.fastersql.dialect.Capability.CONCAT_OPERATOR;
import static io.github.torand.fastersql.dialect.Capability.CURRENT_TIME;
import static io.github.torand.fastersql.dialect.Capability.LIMIT_OFFSET;
import static io.github.torand.fastersql.dialect.Capability.MODULO_OPERATOR;
import static io.github.torand.fastersql.dialect.Capability.NULL_ORDERING;
import static io.github.torand.fastersql.dialect.Capability.SELECT_FOR_UPDATE;
import static io.github.torand.fastersql.dialect.Capability.TRUNCATE_TABLE;

/**
 * Defines the H2 SQL dialect.
 *
 * <a href="https://www.h2database.com/html/grammar.html" />
 */
public class H2Dialect implements Dialect {
    private static final EnumSet<Capability> SUPPORTED_CAPS = EnumSet.of(LIMIT_OFFSET, CONCAT_OPERATOR, MODULO_OPERATOR, CURRENT_TIME, NULL_ORDERING, SELECT_FOR_UPDATE, TRUNCATE_TABLE);

    @Override
    public String getProductName() {
        return "H2";
    }

    @Override
    public boolean offsetBeforeLimit() {
        return false;
    }

    @Override
    public Optional<String> formatRowOffsetClause() {
        return Optional.of("offset ?");
    }

    @Override
    public Optional<String> formatRowLimitClause() {
        return Optional.of("limit ?");
    }

    @Override
    public Optional<String> formatRowNumLiteral() {
        return Optional.of("rownum()");
    }

    @Override
    public String formatToNumberFunction(String operand, int precision, int scale) {
        return "to_number(" + operand + ")";
    }

    @Override
    public String formatToCharFunction(String operand, String format) {
        return "to_char(" + operand + ", " + format + ")";
    }

    @Override
    public String formatSubstringFunction(String operand, int startPos, int length) {
        return "substring(" + operand + ", " + startPos + ", " + length + ")";
    }

    @Override
    public String formatConcatFunction(List<String> operands) {
        throw new UnsupportedOperationException("H2 does not support the concat() function (use the concat infix operator instead)");
    }

    @Override
    public String formatLengthFunction(String operand) {
        return "char_length(" + operand + ")";
    }

    @Override
    public String formatCeilFunction(String operand) {
        return "ceiling(" + operand + ")";
    }

    @Override
    public String formatRoundFunction(String operand) {
        return "round(" + operand + ")";
    }

    @Override
    public String formatModuloFunction(String divisor, String dividend) {
        throw new UnsupportedOperationException("H2 does not support the mod() function (use the modulo infix operator instead)");
    }

    @Override
    public String formatCurrentDateFunction() {
        return "current_date";
    }

    @Override
    public Optional<String> getConcatOperator() {
        return Optional.of("||");
    }

    @Override
    public boolean supports(Capability capability) {
        return SUPPORTED_CAPS.contains(capability);
    }

    /**
     * Adds some user defined functions emulating common SQL constructs not supported by default.
     * @param connection a live H2 connection.
     * @return the modified dialect.
     */
    public H2Dialect withCustomizations(Connection connection) {
        String source = """
            import java.lang.*;
            @CODE
            Double toNumber(String value) throws Exception {
                return value == null ? null : Double.valueOf(value);
            }
            """;

        try (PreparedStatement preparedStatement = connection.prepareStatement("CREATE ALIAS IF NOT EXISTS TO_NUMBER AS '%s'".formatted(source))) {
            preparedStatement.execute();
            return this;
        } catch (SQLException e) {
            throw new RuntimeException("Failed to setup H2 customizations", e);
        }
    }
}

1	/*
2	* Copyright (c) 2024-2025 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.dialect;
17
18	import java.sql.Connection;
19	import java.sql.PreparedStatement;
20	import java.sql.SQLException;
21	import java.util.EnumSet;
22	import java.util.List;
23	import java.util.Optional;
24
25	import static io.github.torand.fastersql.dialect.Capability.CONCAT_OPERATOR;
26	import static io.github.torand.fastersql.dialect.Capability.CURRENT_TIME;
27	import static io.github.torand.fastersql.dialect.Capability.LIMIT_OFFSET;
28	import static io.github.torand.fastersql.dialect.Capability.MODULO_OPERATOR;
29	import static io.github.torand.fastersql.dialect.Capability.NULL_ORDERING;
30	import static io.github.torand.fastersql.dialect.Capability.SELECT_FOR_UPDATE;
31	import static io.github.torand.fastersql.dialect.Capability.TRUNCATE_TABLE;
32
33	/**
34	* Defines the H2 SQL dialect.
35	*
36	* <a href="https://www.h2database.com/html/grammar.html" />
37	*/
38	public class H2Dialect implements Dialect {	3✔
39	private static final EnumSet<Capability> SUPPORTED_CAPS = EnumSet.of(LIMIT_OFFSET, CONCAT_OPERATOR, MODULO_OPERATOR, CURRENT_TIME, NULL_ORDERING, SELECT_FOR_UPDATE, TRUNCATE_TABLE);	30✔
40
41	@Override
42	public String getProductName() {
43	return "H2";	2✔
44	}
45
46	@Override
47	public boolean offsetBeforeLimit() {
48	return false;	2✔
49	}
50
51	@Override
52	public Optional<String> formatRowOffsetClause() {
53	return Optional.of("offset ?");	3✔
54	}
55
56	@Override
57	public Optional<String> formatRowLimitClause() {
58	return Optional.of("limit ?");	3✔
59	}
60
61	@Override
62	public Optional<String> formatRowNumLiteral() {
UNCOV 63	return Optional.of("rownum()");	×
64	}
65
66	@Override
67	public String formatToNumberFunction(String operand, int precision, int scale) {
68	return "to_number(" + operand + ")";	3✔
69	}
70
71	@Override
72	public String formatToCharFunction(String operand, String format) {
73	return "to_char(" + operand + ", " + format + ")";	4✔
74	}
75
76	@Override
77	public String formatSubstringFunction(String operand, int startPos, int length) {
78	return "substring(" + operand + ", " + startPos + ", " + length + ")";	5✔
79	}
80
81	@Override
82	public String formatConcatFunction(List<String> operands) {
UNCOV 83	throw new UnsupportedOperationException("H2 does not support the concat() function (use the concat infix operator instead)");	×
84	}
85
86	@Override
87	public String formatLengthFunction(String operand) {
88	return "char_length(" + operand + ")";	3✔
89	}
90
91	@Override
92	public String formatCeilFunction(String operand) {
93	return "ceiling(" + operand + ")";	3✔
94	}
95
96	@Override
97	public String formatRoundFunction(String operand) {
98	return "round(" + operand + ")";	3✔
99	}
100
101	@Override
102	public String formatModuloFunction(String divisor, String dividend) {
UNCOV 103	throw new UnsupportedOperationException("H2 does not support the mod() function (use the modulo infix operator instead)");	×
104	}
105
106	@Override
107	public String formatCurrentDateFunction() {
108	return "current_date";	2✔
109	}
110
111	@Override
112	public Optional<String> getConcatOperator() {
113	return Optional.of("\|\|");	3✔
114	}
115
116	@Override
117	public boolean supports(Capability capability) {
118	return SUPPORTED_CAPS.contains(capability);	4✔
119	}
120
121	/**
122	* Adds some user defined functions emulating common SQL constructs not supported by default.
123	* @param connection a live H2 connection.
124	* @return the modified dialect.
125	*/
126	public H2Dialect withCustomizations(Connection connection) {
127	String source = """	2✔
128	import java.lang.*;
129	@CODE
130	Double toNumber(String value) throws Exception {
131	return value == null ? null : Double.valueOf(value);
132	}
133	""";
134
135	try (PreparedStatement preparedStatement = connection.prepareStatement("CREATE ALIAS IF NOT EXISTS TO_NUMBER AS '%s'".formatted(source))) {	11✔
136	preparedStatement.execute();	3✔
137	return this;	4✔
138	} catch (SQLException e) {	×
UNCOV 139	throw new RuntimeException("Failed to setup H2 customizations", e);	×
140	}
141	}
142	}

torand / FasterSQL / 15294773771

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