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Hibernate example source code file (UniqueKey.java)
The Hibernate UniqueKey.java source code/* * Hibernate, Relational Persistence for Idiomatic Java * * Copyright (c) 2010 by Red Hat Inc and/or its affiliates or by * third-party contributors as indicated by either @author tags or express * copyright attribution statements applied by the authors. All * third-party contributions are distributed under license by Red Hat Inc. * * This copyrighted material is made available to anyone wishing to use, modify, * copy, or redistribute it subject to the terms and conditions of the GNU * Lesser General Public License, as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License * for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this distribution; if not, write to: * Free Software Foundation, Inc. * 51 Franklin Street, Fifth Floor * Boston, MA 02110-1301 USA */ package org.hibernate.metamodel.relational; import org.hibernate.dialect.Dialect; import org.hibernate.internal.util.StringHelper; /** * Models a SQL <tt>INDEX defined as UNIQUE * * @author Gavin King * @author Steve Ebersole */ public class UniqueKey extends AbstractConstraint implements Constraint { protected UniqueKey(Table table, String name) { super( table, name ); } @Override public String getExportIdentifier() { StringBuilder sb = new StringBuilder( getTable().getLoggableValueQualifier() ); sb.append( ".UK" ); for ( Column column : getColumns() ) { sb.append( '_' ).append( column.getColumnName().getName() ); } return sb.toString(); } public boolean isCreationVetoed(Dialect dialect) { if ( dialect.supportsNotNullUnique() ) { return false; } for ( Column column : getColumns() ) { if ( column.isNullable() ) { return true; } } return false; } public String sqlConstraintStringInCreateTable(Dialect dialect) { StringBuffer buf = new StringBuffer( "unique (" ); boolean hadNullableColumn = false; boolean first = true; for ( Column column : getColumns() ) { if ( first ) { first = false; } else { buf.append( ", " ); } if ( !hadNullableColumn && column.isNullable() ) { hadNullableColumn = true; } buf.append( column.getColumnName().encloseInQuotesIfQuoted( dialect ) ); } //do not add unique constraint on DB not supporting unique and nullable columns return !hadNullableColumn || dialect.supportsNotNullUnique() ? buf.append( ')' ).toString() : null; } public String sqlConstraintStringInAlterTable(Dialect dialect) { StringBuffer buf = new StringBuffer( dialect.getAddPrimaryKeyConstraintString( getName() ) ).append( '(' ); boolean nullable = false; boolean first = true; for ( Column column : getColumns() ) { if ( first ) { first = false; } else { buf.append( ", " ); } if ( !nullable && column.isNullable() ) { nullable = true; } buf.append( column.getColumnName().encloseInQuotesIfQuoted( dialect ) ); } return !nullable || dialect.supportsNotNullUnique() ? StringHelper.replace( buf.append( ')' ).toString(), "primary key", "unique" ) : //TODO: improve this hack! null; } } Other Hibernate examples (source code examples)Here is a short list of links related to this Hibernate UniqueKey.java source code file: |
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