001package ca.uhn.fhir.jpa.migrate.taskdef;
002
003/*-
004 * #%L
005 * HAPI FHIR Server - SQL Migration
006 * %%
007 * Copyright (C) 2014 - 2022 Smile CDR, Inc.
008 * %%
009 * Licensed under the Apache License, Version 2.0 (the "License");
010 * you may not use this file except in compliance with the License.
011 * You may obtain a copy of the License at
012 *
013 *      http://www.apache.org/licenses/LICENSE-2.0
014 *
015 * Unless required by applicable law or agreed to in writing, software
016 * distributed under the License is distributed on an "AS IS" BASIS,
017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018 * See the License for the specific language governing permissions and
019 * limitations under the License.
020 * #L%
021 */
022
023import ca.uhn.fhir.i18n.Msg;
024import ca.uhn.fhir.jpa.migrate.DriverTypeEnum;
025import ca.uhn.fhir.jpa.migrate.JdbcUtils;
026import org.apache.commons.lang3.Validate;
027import org.apache.commons.lang3.builder.EqualsBuilder;
028import org.apache.commons.lang3.builder.HashCodeBuilder;
029import org.slf4j.Logger;
030import org.slf4j.LoggerFactory;
031
032import javax.annotation.Nonnull;
033import java.sql.SQLException;
034import java.util.ArrayList;
035import java.util.List;
036import java.util.Set;
037
038import static org.apache.commons.lang3.StringUtils.isNotBlank;
039
040public class DropForeignKeyTask extends BaseTableTask {
041
042        private static final Logger ourLog = LoggerFactory.getLogger(DropForeignKeyTask.class);
043        private String myConstraintName;
044        private String myParentTableName;
045
046        public DropForeignKeyTask(String theProductVersion, String theSchemaVersion) {
047                super(theProductVersion, theSchemaVersion);
048        }
049
050        @Nonnull
051        static List<String> generateSql(String theTableName, String theConstraintName, DriverTypeEnum theDriverType) {
052                List<String> sqls = new ArrayList<>();
053                switch (theDriverType) {
054                        case MYSQL_5_7:
055                        case MARIADB_10_1:
056                                // Lousy MYQL....
057                                sqls.add("alter table " + theTableName + " drop foreign key " + theConstraintName);
058                                break;
059                        case POSTGRES_9_4:
060                        case DERBY_EMBEDDED:
061                        case H2_EMBEDDED:
062                        case ORACLE_12C:
063                        case MSSQL_2012:
064                                sqls.add("alter table " + theTableName + " drop constraint " + theConstraintName);
065                                break;
066                        default:
067                                throw new IllegalStateException(Msg.code(59));
068                }
069                return sqls;
070        }
071
072        public void setConstraintName(String theConstraintName) {
073                myConstraintName = theConstraintName;
074        }
075
076        public void setParentTableName(String theParentTableName) {
077                myParentTableName = theParentTableName;
078        }
079
080        @Override
081        public void validate() {
082                super.validate();
083
084                Validate.isTrue(isNotBlank(myConstraintName));
085                Validate.isTrue(isNotBlank(myParentTableName));
086                setDescription("Drop foreign key " + myConstraintName + " from table " + getTableName());
087
088        }
089
090        @Override
091        public void doExecute() throws SQLException {
092
093                Set<String> existing = JdbcUtils.getForeignKeys(getConnectionProperties(), myParentTableName, getTableName());
094                if (!existing.contains(myConstraintName)) {
095                        logInfo(ourLog, "Don't have constraint named {} - No action performed", myConstraintName);
096                        return;
097                }
098
099                List<String> sqls = generateSql(getTableName(), myConstraintName, getDriverType());
100
101                for (String next : sqls) {
102                        executeSql(getTableName(), next);
103                }
104
105        }
106
107        @Override
108        protected void generateEquals(EqualsBuilder theBuilder, BaseTask theOtherObject) {
109                DropForeignKeyTask otherObject = (DropForeignKeyTask) theOtherObject;
110                super.generateEquals(theBuilder, otherObject);
111                theBuilder.append(myConstraintName, otherObject.myConstraintName);
112                theBuilder.append(myParentTableName, otherObject.myParentTableName);
113        }
114
115        @Override
116        protected void generateHashCode(HashCodeBuilder theBuilder) {
117                super.generateHashCode(theBuilder);
118                theBuilder.append(myConstraintName);
119                theBuilder.append(myParentTableName);
120        }
121}