16990059345

Committed 15 Aug 2025 12:34PM UTC coverage: 66.782% (-6.6%) from 73.399%

Build # 16990059345

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push

github

Committed by

torand

Commit Message

chore: access central snapshots

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294 of 598 branches covered (49.16%)

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44.64

/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 io.github.torand.fastersql.function.singlerow.cast.DataType;

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.SET_OPERATION_PARENTHESES;
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, SET_OPERATION_PARENTHESES);

    /**
     * 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 formatLnFunction(String operand) {
        return "ln(" + 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> getDataType(DataType dataType) {
        // https://www.h2database.com/html/datatypes.html
        return Optional.ofNullable(switch(dataType.getIsoDataType()) {
            case BOOLEAN -> "boolean";
            case CHAR -> "char";
            case VARCHAR -> "varchar";
            case BIT, BIT_VARYING -> null;
            case NUMERIC -> "numeric";
            case DECIMAL -> "decimal";
            case INTEGER -> "integer";
            case SMALLINT -> "smallint";
            case FLOAT, DOUBLE_PRECISION -> "float";
            case REAL -> "real";
            case DATE -> "date";
            case TIME -> "time";
            case INTERVAL -> "interval";
            case CHARACTER_LARGE_OBJECT -> "clob";
            case BINARY_LARGE_OBJECT -> "blob";
        });
    }

    @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 io.github.torand.fastersql.function.singlerow.cast.DataType;
19
20	import java.sql.Connection;
21	import java.sql.PreparedStatement;
22	import java.sql.SQLException;
23	import java.util.EnumSet;
24	import java.util.List;
25	import java.util.Optional;
26
27	import static io.github.torand.fastersql.dialect.Capability.CONCAT_OPERATOR;
28	import static io.github.torand.fastersql.dialect.Capability.CURRENT_TIME;
29	import static io.github.torand.fastersql.dialect.Capability.LIMIT_OFFSET;
30	import static io.github.torand.fastersql.dialect.Capability.MODULO_OPERATOR;
31	import static io.github.torand.fastersql.dialect.Capability.NULL_ORDERING;
32	import static io.github.torand.fastersql.dialect.Capability.SELECT_FOR_UPDATE;
33	import static io.github.torand.fastersql.dialect.Capability.SET_OPERATION_PARENTHESES;
34	import static io.github.torand.fastersql.dialect.Capability.TRUNCATE_TABLE;
35
36	/**
37	* Defines the <a href="https://www.h2database.com/html/grammar.html">H2</a> SQL dialect.
38	*/
39	public class H2Dialect implements Dialect {
40	private static final EnumSet<Capability> SUPPORTED_CAPS = EnumSet.of(LIMIT_OFFSET, CONCAT_OPERATOR, MODULO_OPERATOR, CURRENT_TIME, NULL_ORDERING, SELECT_FOR_UPDATE, TRUNCATE_TABLE, SET_OPERATION_PARENTHESES);	34✔
41
42	/**
43	* Creates a H2 {@link Dialect} implementation.
44	*/
45	public H2Dialect() {}	3✔
46
47	@Override
48	public String getProductName() {
49	return "H2";	2✔
50	}
51
52	@Override
53	public boolean offsetBeforeLimit() {
54	return false;	2✔
55	}
56
57	@Override
58	public Optional<String> formatRowOffsetClause() {
59	return Optional.of("offset ?");	3✔
60	}
61
62	@Override
63	public Optional<String> formatRowLimitClause() {
64	return Optional.of("limit ?");	3✔
65	}
66
67	@Override
68	public Optional<String> formatRowNumLiteral() {
69	return Optional.of("rownum()");	×
70	}
71
72	@Override
73	public String formatToNumberFunction(String operand, int precision, int scale) {
74	return "to_number(" + operand + ")";	3✔
75	}
76
77	@Override
78	public String formatToCharFunction(String operand, String format) {
79	return "to_char(" + operand + ", " + format + ")";	4✔
80	}
81
82	@Override
83	public String formatSubstringFunction(String operand, int startPos, int length) {
84	return "substring(" + operand + ", " + startPos + ", " + length + ")";	5✔
85	}
86
87	@Override
88	public String formatConcatFunction(List<String> operands) {
89	throw new UnsupportedOperationException("H2 does not support the concat() function (use the concat infix operator instead)");	×
90	}
91
92	@Override
93	public String formatLengthFunction(String operand) {
94	return "char_length(" + operand + ")";	3✔
95	}
96
97	@Override
98	public String formatCeilFunction(String operand) {
99	return "ceiling(" + operand + ")";	3✔
100	}
101
102	@Override
103	public String formatLnFunction(String operand) {
104	return "ln(" + operand + ")";	3✔
105	}
106
107	@Override
108	public String formatRoundFunction(String operand) {
109	return "round(" + operand + ")";	3✔
110	}
111
112	@Override
113	public String formatModuloFunction(String divisor, String dividend) {
114	throw new UnsupportedOperationException("H2 does not support the mod() function (use the modulo infix operator instead)");	×
115	}
116
117	@Override
118	public String formatCurrentDateFunction() {
119	return "current_date";	2✔
120	}
121
122	@Override
123	public Optional<String> getDataType(DataType dataType) {
124	// https://www.h2database.com/html/datatypes.html
125	return Optional.ofNullable(switch(dataType.getIsoDataType()) {	8!
126	case BOOLEAN -> "boolean";	×
127	case CHAR -> "char";	×
128	case VARCHAR -> "varchar";	2✔
129	case BIT, BIT_VARYING -> null;	×
130	case NUMERIC -> "numeric";	×
131	case DECIMAL -> "decimal";	2✔
132	case INTEGER -> "integer";	×
133	case SMALLINT -> "smallint";	×
134	case FLOAT, DOUBLE_PRECISION -> "float";	×
135	case REAL -> "real";	×
136	case DATE -> "date";	×
137	case TIME -> "time";	×
138	case INTERVAL -> "interval";	×
139	case CHARACTER_LARGE_OBJECT -> "clob";	×
140	case BINARY_LARGE_OBJECT -> "blob";	×
141	});
142	}
143
144	@Override
145	public Optional<String> getConcatOperator() {
146	return Optional.of("\|\|");	3✔
147	}
148
149	@Override
150	public boolean supports(Capability capability) {
151	return SUPPORTED_CAPS.contains(capability);	4✔
152	}
153
154	/**
155	* Adds some user defined functions emulating common SQL constructs not supported by default.
156	* @param connection a live H2 connection.
157	* @return the modified dialect.
158	*/
159	public H2Dialect withCustomizations(Connection connection) {
160	String source = """	2✔
161	import java.lang.*;
162	@CODE
163	Double toNumber(String value) throws Exception {
164	return value == null ? null : Double.valueOf(value);
165	}
166	""";
167
168	try (PreparedStatement preparedStatement = connection.prepareStatement("CREATE ALIAS IF NOT EXISTS TO_NUMBER AS '%s'".formatted(source))) {	11✔
169	preparedStatement.execute();	3✔
170	return this;	4✔
171	} catch (SQLException e) {	×
172	throw new RuntimeException("Failed to setup H2 customizations", e);	×
173	}
174	}
175	}

torand / FasterSQL / 16990059345

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