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- /*
- * SonarQube
- * Copyright (C) 2009-2021 SonarSource SA
- * mailto:info AT sonarsource DOT com
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 3 of the License, or (at your option) any later version.
- *
- * 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 program; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
- package org.sonar.server.platform.db.migration.sql;
-
- import java.util.ArrayList;
- import java.util.Collections;
- import java.util.Iterator;
- import java.util.List;
- import org.sonar.db.dialect.Dialect;
- import org.sonar.db.dialect.Oracle;
- import org.sonar.db.dialect.PostgreSql;
- import org.sonar.server.platform.db.migration.def.ColumnDef;
-
- import static com.google.common.base.Preconditions.checkArgument;
- import static com.google.common.collect.Lists.newArrayList;
- import static org.sonar.server.platform.db.migration.def.Validations.validateTableName;
-
- /**
- * Generate SQL queries to update multiple columns of a single table.
- *
- * Note that this operation will not be re-entrant on:
- * <ul>
- * <li>Oracle 11G (may raise {@code ORA-01442: column to be modified to NOT NULL is already NOT NULL} or
- * {@code ORA-01451: column to be modified to NULL cannot be modified to NULL})</li>
- * </ul>
- */
- public class AlterColumnsBuilder {
-
- private static final String ALTER_TABLE = "ALTER TABLE ";
- private static final String ALTER_COLUMN = "ALTER COLUMN ";
-
- private final Dialect dialect;
- private final String tableName;
- private final List<ColumnDef> columnDefs = newArrayList();
-
- public AlterColumnsBuilder(Dialect dialect, String tableName) {
- this.dialect = dialect;
- this.tableName = validateTableName(tableName);
- }
-
- public AlterColumnsBuilder updateColumn(ColumnDef columnDef) {
- // limitation of Oracle, only attribute changes must be defined in ALTER.
- checkArgument(columnDef.getDefaultValue()==null, "Default value is not supported on alter of column '%s'", columnDef.getName());
- columnDefs.add(columnDef);
- return this;
- }
-
- public List<String> build() {
- if (columnDefs.isEmpty()) {
- throw new IllegalStateException("No column has been defined");
- }
- switch (dialect.getId()) {
- case PostgreSql.ID:
- return createPostgresQuery();
- case Oracle.ID:
- return createOracleQuery();
- default:
- return createMsSqlAndH2Queries();
- }
- }
-
- private List<String> createPostgresQuery() {
- StringBuilder sql = new StringBuilder(ALTER_TABLE + tableName + " ");
- for (Iterator<ColumnDef> columnDefIterator = columnDefs.iterator(); columnDefIterator.hasNext();) {
- ColumnDef columnDef = columnDefIterator.next();
- sql.append(ALTER_COLUMN);
- addColumn(sql, columnDef, "TYPE ", false);
- sql.append(", ");
- sql.append(ALTER_COLUMN);
- sql.append(columnDef.getName());
- sql.append(' ').append(columnDef.isNullable() ? "DROP" : "SET").append(" NOT NULL");
- if (columnDefIterator.hasNext()) {
- sql.append(", ");
- }
- }
- return Collections.singletonList(sql.toString());
- }
-
- private List<String> createOracleQuery() {
- List<String> sqls = new ArrayList<>();
- for (ColumnDef columnDef : columnDefs) {
- StringBuilder sql = new StringBuilder(ALTER_TABLE + tableName + " ").append("MODIFY (");
- addColumn(sql, columnDef, "", true);
- sql.append(")");
- sqls.add(sql.toString());
- }
- return sqls;
- }
-
- private List<String> createMsSqlAndH2Queries() {
- List<String> sqls = new ArrayList<>();
- for (ColumnDef columnDef : columnDefs) {
- StringBuilder defaultQuery = new StringBuilder(ALTER_TABLE + tableName + " ");
- defaultQuery.append(ALTER_COLUMN);
- addColumn(defaultQuery, columnDef, "", true);
- sqls.add(defaultQuery.toString());
- }
- return sqls;
- }
-
- private void addColumn(StringBuilder sql, ColumnDef columnDef, String typePrefix, boolean addNotNullableProperty) {
- sql.append(columnDef.getName())
- .append(" ")
- .append(typePrefix)
- .append(columnDef.generateSqlType(dialect));
- if (addNotNullableProperty) {
- sql.append(columnDef.isNullable() ? " NULL" : " NOT NULL");
- }
- }
- }
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