15346133148

Committed 30 May 2025 11:50AM UTC coverage: 70.397% (+0.1%) from 70.298%

Build # 15346133148

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torand

Commit Message

chore: test javadoc publish

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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 <a href="https://www.h2database.com/html/grammar.html">H2</a> SQL dialect.
 */
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);

    /**
     * Creates a H2 {@link Dialect} implementation.
     */
    public H2Dialect() {}

    @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 <a href="https://www.h2database.com/html/grammar.html">H2</a> SQL dialect.
35	*/
36	public class H2Dialect implements Dialect {
37	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✔
38
39	/**
40	* Creates a H2 {@link Dialect} implementation.
41	*/
42	public H2Dialect() {}	3✔
43
44	@Override
45	public String getProductName() {
46	return "H2";	2✔
47	}
48
49	@Override
50	public boolean offsetBeforeLimit() {
51	return false;	2✔
52	}
53
54	@Override
55	public Optional<String> formatRowOffsetClause() {
56	return Optional.of("offset ?");	3✔
57	}
58
59	@Override
60	public Optional<String> formatRowLimitClause() {
61	return Optional.of("limit ?");	3✔
62	}
63
64	@Override
65	public Optional<String> formatRowNumLiteral() {
66	return Optional.of("rownum()");	×
67	}
68
69	@Override
70	public String formatToNumberFunction(String operand, int precision, int scale) {
71	return "to_number(" + operand + ")";	3✔
72	}
73
74	@Override
75	public String formatToCharFunction(String operand, String format) {
76	return "to_char(" + operand + ", " + format + ")";	4✔
77	}
78
79	@Override
80	public String formatSubstringFunction(String operand, int startPos, int length) {
81	return "substring(" + operand + ", " + startPos + ", " + length + ")";	5✔
82	}
83
84	@Override
85	public String formatConcatFunction(List<String> operands) {
86	throw new UnsupportedOperationException("H2 does not support the concat() function (use the concat infix operator instead)");	×
87	}
88
89	@Override
90	public String formatLengthFunction(String operand) {
91	return "char_length(" + operand + ")";	3✔
92	}
93
94	@Override
95	public String formatCeilFunction(String operand) {
96	return "ceiling(" + operand + ")";	3✔
97	}
98
99	@Override
100	public String formatRoundFunction(String operand) {
101	return "round(" + operand + ")";	3✔
102	}
103
104	@Override
105	public String formatModuloFunction(String divisor, String dividend) {
106	throw new UnsupportedOperationException("H2 does not support the mod() function (use the modulo infix operator instead)");	×
107	}
108
109	@Override
110	public String formatCurrentDateFunction() {
111	return "current_date";	2✔
112	}
113
114	@Override
115	public Optional<String> getConcatOperator() {
116	return Optional.of("\|\|");	3✔
117	}
118
119	@Override
120	public boolean supports(Capability capability) {
121	return SUPPORTED_CAPS.contains(capability);	4✔
122	}
123
124	/**
125	* Adds some user defined functions emulating common SQL constructs not supported by default.
126	* @param connection a live H2 connection.
127	* @return the modified dialect.
128	*/
129	public H2Dialect withCustomizations(Connection connection) {
130	String source = """	2✔
131	import java.lang.*;
132	@CODE
133	Double toNumber(String value) throws Exception {
134	return value == null ? null : Double.valueOf(value);
135	}
136	""";
137
138	try (PreparedStatement preparedStatement = connection.prepareStatement("CREATE ALIAS IF NOT EXISTS TO_NUMBER AS '%s'".formatted(source))) {	11✔
139	preparedStatement.execute();	3✔
140	return this;	4✔
141	} catch (SQLException e) {	×
142	throw new RuntimeException("Failed to setup H2 customizations", e);	×
143	}
144	}
145	}

torand / FasterSQL / 15346133148

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