/*
* Copyright 2014-2016 CyberVision, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.kaaproject.kaa.server.datamigration.utils.datadefinition;
import static java.lang.String.format;
import org.apache.commons.dbutils.QueryRunner;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
public class DataDefinition {
private static final String QUERY_FIND_FK_NAME = "SELECT CONSTRAINT_NAME FROM "
+ "INFORMATION_SCHEMA.KEY_COLUMN_USAGE WHERE REFERENCED_TABLE_SCHEMA = 'kaa'"
+ " AND TABLE_NAME = '%s' and referenced_table_name='%s'";
private Connection connection;
public DataDefinition(Connection connection) {
this.connection = connection;
}
public AlterBuilder alterTable(String tableName) {
return new AlterBuilder(tableName);
}
/**
* Drop foreign key with autogenerated name based on the table where constrain declared and
* referenced table name.
*/
public void dropUnnamedFk(String tableName, String referencedTableName) throws SQLException {
QueryRunner runner = new QueryRunner();
String query = String.format(QUERY_FIND_FK_NAME, tableName, referencedTableName);
String fkName = runner.query(connection, query, rs -> rs.next() ? rs.getString(1) : null);
if (fkName != null) {
runner.update(connection, "ALTER TABLE " + tableName + " DROP FOREIGN KEY " + fkName);
} else {
System.err.println("FK name not found");
}
}
public class AlterBuilder {
private String tableName;
private List<Constraint> addConstrains = new ArrayList<>();
AlterBuilder(String tableName) {
this.tableName = tableName;
}
public AlterBuilder add(Constraint constraint) {
addConstrains.add(constraint);
return this;
}
/**
* Execute created query.
*
* @throws SQLException the sql exception
*/
public void execute() throws SQLException {
StringBuilder sql = new StringBuilder("ALTER TABLE " + tableName + "\n");
for (int i = 0; i < addConstrains.size(); i++) {
Constraint constraint = addConstrains.get(i);
switch (constraint.getType()) {
case FK:
sql.append(format("ADD CONSTRAINT %s FOREIGN KEY (%s) REFERENCES %s(%s) \n",
constraint.getConstraintName(),
constraint.getField(),
constraint.getReferencedTable(),
constraint.getReferencedField())
);
if (constraint.getOnDeleteOpt() != null) {
sql.append("ON DELETE " + constraint.getOnDeleteOpt() + "\n");
}
if (constraint.getOnUpdateOpt() != null) {
sql.append("ON UPDATE " + constraint.getOnUpdateOpt() + "\n");
}
break;
case PK:
sql.append(format("ADD CONSTRAINT %s PRIMARY KEY (%s)\n",
constraint.getConstraintName(), constraint.getField()));
break;
case UNIQUE:
sql.append(format("ADD CONSTRAINT %s UNIQUE (%s)\n",
constraint.getConstraintName(), constraint.getField()));
break;
default:
break;
}
if (i < addConstrains.size() - 1) {
sql.append(", \n");
} else {
sql.append(";");
}
}
QueryRunner runner = new QueryRunner();
runner.update(connection, sql.toString());
}
}
}