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| 1 | +/* Hibernate, Relational Persistence for Idiomatic Java |
| 2 | + * |
| 3 | + * SPDX-License-Identifier: Apache-2.0 |
| 4 | + * Copyright: Red Hat Inc. and Hibernate Authors |
| 5 | + */ |
| 6 | +package org.hibernate.reactive.persister.entity.impl; |
| 7 | + |
| 8 | +import java.util.Iterator; |
| 9 | + |
| 10 | +import org.hibernate.HibernateException; |
| 11 | +import org.hibernate.MappingException; |
| 12 | +import org.hibernate.dialect.CockroachDB192Dialect; |
| 13 | +import org.hibernate.dialect.DB2Dialect; |
| 14 | +import org.hibernate.dialect.Dialect; |
| 15 | +import org.hibernate.dialect.PostgreSQL81Dialect; |
| 16 | +import org.hibernate.dialect.SQLServerDialect; |
| 17 | +import org.hibernate.id.IdentityGenerator; |
| 18 | +import org.hibernate.id.PostInsertIdentityPersister; |
| 19 | +import org.hibernate.id.insert.IdentifierGeneratingInsert; |
| 20 | +import org.hibernate.id.insert.InsertGeneratedIdentifierDelegate; |
| 21 | +import org.hibernate.sql.Insert; |
| 22 | + |
| 23 | +/** |
| 24 | + * Fix the insert and select id queries generated by Hibernate ORM |
| 25 | + */ |
| 26 | +public class ReactiveIdentityGenerator extends IdentityGenerator { |
| 27 | + |
| 28 | + @Override |
| 29 | + public InsertGeneratedIdentifierDelegate getInsertGeneratedIdentifierDelegate( |
| 30 | + PostInsertIdentityPersister persister, Dialect dialect, boolean isGetGeneratedKeysEnabled) |
| 31 | + throws HibernateException { |
| 32 | + return new ReactiveInsertAndSelectDelegate( persister, dialect ); |
| 33 | + } |
| 34 | + |
| 35 | + public static class ReactiveInsertAndSelectDelegate extends InsertSelectDelegate { |
| 36 | + |
| 37 | + private final PostInsertIdentityPersister persister; |
| 38 | + private final Dialect dialect; |
| 39 | + |
| 40 | + public ReactiveInsertAndSelectDelegate(PostInsertIdentityPersister persister, Dialect dialect) { |
| 41 | + super( persister, dialect ); |
| 42 | + this.persister = persister; |
| 43 | + this.dialect = dialect; |
| 44 | + } |
| 45 | + |
| 46 | + @Override |
| 47 | + public IdentifierGeneratingInsert prepareIdentifierGeneratingInsert() { |
| 48 | + IdentifierGeneratingInsert insert = createInsert(); |
| 49 | + insert.addIdentityColumn( persister.getRootTableKeyColumnNames()[0] ); |
| 50 | + return insert; |
| 51 | + } |
| 52 | + |
| 53 | + private IdentifierGeneratingInsert createInsert() { |
| 54 | + if ( dialect instanceof PostgreSQL81Dialect || dialect instanceof CockroachDB192Dialect ) { |
| 55 | + return new PostgresIdentifierGeneratingInsert( dialect ); |
| 56 | + } |
| 57 | + if ( dialect instanceof SQLServerDialect ) { |
| 58 | + return new SqlServerIdentifierGeneratingInsert( dialect ); |
| 59 | + } |
| 60 | + if ( dialect instanceof DB2Dialect ) { |
| 61 | + return new Db2IdentifierGeneratingInsert( dialect ); |
| 62 | + } |
| 63 | + return super.prepareIdentifierGeneratingInsert(); |
| 64 | + } |
| 65 | + } |
| 66 | + |
| 67 | + public static class Db2IdentifierGeneratingInsert extends IdentifierGeneratingInsert { |
| 68 | + |
| 69 | + private String identityColumnName; |
| 70 | + |
| 71 | + public Db2IdentifierGeneratingInsert(Dialect dialect) { |
| 72 | + super( dialect ); |
| 73 | + } |
| 74 | + |
| 75 | + @Override |
| 76 | + public Insert addIdentityColumn(String columnName) { |
| 77 | + this.identityColumnName = columnName; |
| 78 | + return super.addIdentityColumn( columnName ); |
| 79 | + } |
| 80 | + |
| 81 | + /** |
| 82 | + * @see Insert#toStatementString() |
| 83 | + */ |
| 84 | + @Override |
| 85 | + public String toStatementString() { |
| 86 | + return "select " + identityColumnName + " from NEW TABLE (" + super.toStatementString() + ")"; |
| 87 | + } |
| 88 | + } |
| 89 | + |
| 90 | + public static class PostgresIdentifierGeneratingInsert extends IdentifierGeneratingInsert { |
| 91 | + |
| 92 | + private String identityColumnName; |
| 93 | + |
| 94 | + public PostgresIdentifierGeneratingInsert(Dialect dialect) { |
| 95 | + super( dialect ); |
| 96 | + } |
| 97 | + |
| 98 | + @Override |
| 99 | + public Insert addIdentityColumn(String columnName) { |
| 100 | + this.identityColumnName = columnName; |
| 101 | + return super.addIdentityColumn( columnName ); |
| 102 | + } |
| 103 | + |
| 104 | + @Override |
| 105 | + public String toStatementString() { |
| 106 | + return super.toStatementString() + " returning " + identityColumnName; |
| 107 | + } |
| 108 | + } |
| 109 | + |
| 110 | + public static class SqlServerIdentifierGeneratingInsert extends IdentifierGeneratingInsert { |
| 111 | + private String identityColumnName; |
| 112 | + |
| 113 | + public SqlServerIdentifierGeneratingInsert(Dialect dialect) { |
| 114 | + super( dialect ); |
| 115 | + } |
| 116 | + |
| 117 | + @Override |
| 118 | + public Insert addIdentityColumn(String columnName) { |
| 119 | + this.identityColumnName = columnName; |
| 120 | + return super.addIdentityColumn( columnName ); |
| 121 | + } |
| 122 | + |
| 123 | + /** |
| 124 | + * @see Insert#toStatementString() |
| 125 | + */ |
| 126 | + public String toStatementString() { |
| 127 | + StringBuilder buf = new StringBuilder( columns.size() * 15 + tableName.length() + 10 ); |
| 128 | + if ( comment != null ) { |
| 129 | + buf.append( "/* " ).append( Dialect.escapeComment( comment ) ).append( " */ " ); |
| 130 | + } |
| 131 | + buf.append( "insert into " ).append( tableName ); |
| 132 | + if ( columns.size() == 0 ) { |
| 133 | + if ( getDialect().supportsNoColumnsInsert() ) { |
| 134 | + // This line is missing in ORM |
| 135 | + buf.append( " output inserted." ).append( identityColumnName ); |
| 136 | + buf.append( ' ' ).append( getDialect().getNoColumnsInsertString() ); |
| 137 | + } |
| 138 | + else { |
| 139 | + throw new MappingException( String.format( |
| 140 | + "The INSERT statement for table [%s] contains no column, and this is not supported by [%s]", |
| 141 | + tableName, |
| 142 | + getDialect() |
| 143 | + ) |
| 144 | + ); |
| 145 | + } |
| 146 | + } |
| 147 | + else { |
| 148 | + buf.append( " (" ); |
| 149 | + Iterator<String> iter = columns.keySet().iterator(); |
| 150 | + while ( iter.hasNext() ) { |
| 151 | + buf.append( iter.next() ); |
| 152 | + if ( iter.hasNext() ) { |
| 153 | + buf.append( ", " ); |
| 154 | + } |
| 155 | + } |
| 156 | + buf.append( ")"); |
| 157 | + // This line is missing in ORM |
| 158 | + buf.append( " output inserted." ).append( identityColumnName ); |
| 159 | + buf.append( " values (" ); |
| 160 | + iter = columns.values().iterator(); |
| 161 | + while ( iter.hasNext() ) { |
| 162 | + buf.append( iter.next() ); |
| 163 | + if ( iter.hasNext() ) { |
| 164 | + buf.append( ", " ); |
| 165 | + } |
| 166 | + } |
| 167 | + buf.append( ')' ); |
| 168 | + } |
| 169 | + return buf.toString(); |
| 170 | + } |
| 171 | + } |
| 172 | + |
| 173 | +} |
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