17012572989

Committed 16 Aug 2025 08:26PM UTC coverage: 68.265% (-0.008%) from 68.273%

Build # 17012572989

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push

github

Committed by

torand

Commit Message

refactor: sonar cloud issues

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1 existing line in 1 file now uncovered.

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45.61

/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 io.github.torand.fastersql.statement.FasterSQLException;

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() {
        // Default constructor required by Javadoc
    }

    @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 FasterSQLException("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	import io.github.torand.fastersql.statement.FasterSQLException;
20
21	import java.sql.Connection;
22	import java.sql.PreparedStatement;
23	import java.sql.SQLException;
24	import java.util.EnumSet;
25	import java.util.List;
26	import java.util.Optional;
27
28	import static io.github.torand.fastersql.dialect.Capability.CONCAT_OPERATOR;
29	import static io.github.torand.fastersql.dialect.Capability.CURRENT_TIME;
30	import static io.github.torand.fastersql.dialect.Capability.LIMIT_OFFSET;
31	import static io.github.torand.fastersql.dialect.Capability.MODULO_OPERATOR;
32	import static io.github.torand.fastersql.dialect.Capability.NULL_ORDERING;
33	import static io.github.torand.fastersql.dialect.Capability.SELECT_FOR_UPDATE;
34	import static io.github.torand.fastersql.dialect.Capability.SET_OPERATION_PARENTHESES;
35	import static io.github.torand.fastersql.dialect.Capability.TRUNCATE_TABLE;
36
37	/**
38	* Defines the <a href="https://www.h2database.com/html/grammar.html">H2</a> SQL dialect.
39	*/
40	public class H2Dialect implements Dialect {
41	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✔
42
43	/**
44	* Creates a H2 {@link Dialect} implementation.
45	*/
46	public H2Dialect() {	2✔
47	// Default constructor required by Javadoc
48	}	1✔
49
50	@Override
51	public String getProductName() {
52	return "H2";	2✔
53	}
54
55	@Override
56	public boolean offsetBeforeLimit() {
57	return false;	2✔
58	}
59
60	@Override
61	public Optional<String> formatRowOffsetClause() {
62	return Optional.of("offset ?");	3✔
63	}
64
65	@Override
66	public Optional<String> formatRowLimitClause() {
67	return Optional.of("limit ?");	3✔
68	}
69
70	@Override
71	public Optional<String> formatRowNumLiteral() {
72	return Optional.of("rownum()");	×
73	}
74
75	@Override
76	public String formatToNumberFunction(String operand, int precision, int scale) {
77	return "to_number(" + operand + ")";	3✔
78	}
79
80	@Override
81	public String formatToCharFunction(String operand, String format) {
82	return "to_char(" + operand + ", " + format + ")";	4✔
83	}
84
85	@Override
86	public String formatSubstringFunction(String operand, int startPos, int length) {
87	return "substring(" + operand + ", " + startPos + ", " + length + ")";	5✔
88	}
89
90	@Override
91	public String formatConcatFunction(List<String> operands) {
92	throw new UnsupportedOperationException("H2 does not support the concat() function (use the concat infix operator instead)");	×
93	}
94
95	@Override
96	public String formatLengthFunction(String operand) {
97	return "char_length(" + operand + ")";	3✔
98	}
99
100	@Override
101	public String formatCeilFunction(String operand) {
102	return "ceiling(" + operand + ")";	3✔
103	}
104
105	@Override
106	public String formatLnFunction(String operand) {
107	return "ln(" + operand + ")";	3✔
108	}
109
110	@Override
111	public String formatRoundFunction(String operand) {
112	return "round(" + operand + ")";	3✔
113	}
114
115	@Override
116	public String formatModuloFunction(String divisor, String dividend) {
117	throw new UnsupportedOperationException("H2 does not support the mod() function (use the modulo infix operator instead)");	×
118	}
119
120	@Override
121	public String formatCurrentDateFunction() {
122	return "current_date";	2✔
123	}
124
125	@Override
126	public Optional<String> getDataType(DataType dataType) {
127	// https://www.h2database.com/html/datatypes.html
128	return Optional.ofNullable(switch(dataType.getIsoDataType()) {	8!
129	case BOOLEAN -> "boolean";	×
130	case CHAR -> "char";	×
131	case VARCHAR -> "varchar";	2✔
132	case BIT, BIT_VARYING -> null;	×
133	case NUMERIC -> "numeric";	×
134	case DECIMAL -> "decimal";	2✔
135	case INTEGER -> "integer";	×
136	case SMALLINT -> "smallint";	×
137	case FLOAT, DOUBLE_PRECISION -> "float";	×
138	case REAL -> "real";	×
139	case DATE -> "date";	×
140	case TIME -> "time";	×
141	case INTERVAL -> "interval";	×
142	case CHARACTER_LARGE_OBJECT -> "clob";	×
143	case BINARY_LARGE_OBJECT -> "blob";	×
144	});
145	}
146
147	@Override
148	public Optional<String> getConcatOperator() {
149	return Optional.of("\|\|");	3✔
150	}
151
152	@Override
153	public boolean supports(Capability capability) {
154	return SUPPORTED_CAPS.contains(capability);	4✔
155	}
156
157	/**
158	* Adds some user defined functions emulating common SQL constructs not supported by default.
159	* @param connection a live H2 connection.
160	* @return the modified dialect.
161	*/
162	public H2Dialect withCustomizations(Connection connection) {
163	String source = """	2✔
164	import java.lang.*;
165	@CODE
166	Double toNumber(String value) throws Exception {
167	return value == null ? null : Double.valueOf(value);
168	}
169	""";
170
171	try (PreparedStatement preparedStatement = connection.prepareStatement("CREATE ALIAS IF NOT EXISTS TO_NUMBER AS '%s'".formatted(source))) {	11✔
172	preparedStatement.execute();	3✔
173	return this;	4✔
174	} catch (SQLException e) {	×
NEW 175	throw new FasterSQLException("Failed to setup H2 customizations", e);	×
176	}
177	}
178	}

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