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/*
* SonarQube
* Copyright (C) 2009-2016 SonarSource SA
* mailto:contact 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.db.version;
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.MySql;
import org.sonar.db.dialect.Oracle;
import org.sonar.db.dialect.PostgreSql;
import static com.google.common.collect.Lists.newArrayList;
/**
* 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 = tableName;
}
public AlterColumnsBuilder updateColumn(ColumnDef columnDef) {
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 MySql.ID:
return createMySqlQuery();
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> createMySqlQuery() {
StringBuilder sql = new StringBuilder(ALTER_TABLE + tableName + " ");
addColumns(sql, "MODIFY COLUMN ", "", true);
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 addColumns(StringBuilder sql, String updateKeyword, String typePrefix, boolean addNotNullableProperty) {
for (Iterator<ColumnDef> columnDefIterator = columnDefs.iterator(); columnDefIterator.hasNext();) {
sql.append(updateKeyword);
addColumn(sql, columnDefIterator.next(), typePrefix, addNotNullableProperty);
if (columnDefIterator.hasNext()) {
sql.append(", ");
}
}
}
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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