| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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 com.cloud.upgrade.dao; |
| |
| import java.sql.Connection; |
| import java.sql.PreparedStatement; |
| import java.sql.ResultSet; |
| import java.sql.SQLException; |
| |
| import org.apache.commons.lang3.StringUtils; |
| import org.apache.logging.log4j.Logger; |
| import org.apache.logging.log4j.LogManager; |
| |
| public class DatabaseAccessObject { |
| |
| protected Logger logger = LogManager.getLogger(DatabaseAccessObject.class); |
| |
| public void addForeignKey(Connection conn, String tableName, String tableColumn, String foreignTableName, String foreignColumnName) { |
| String addForeignKeyStmt = String.format("ALTER TABLE `cloud`.`%s` ADD CONSTRAINT `fk_%s__%s` FOREIGN KEY `fk_%s__%s`(`%s`) REFERENCES `%s`(`%s`)", tableName, tableName, tableColumn, tableName, tableColumn, tableColumn, foreignTableName, foreignColumnName); |
| try(PreparedStatement pstmt = conn.prepareStatement(addForeignKeyStmt);) |
| { |
| pstmt.executeUpdate(); |
| logger.debug(String.format("Foreign key is added successfully from the table %s", tableName)); |
| } catch (SQLException e) { |
| logger.error("Ignored SQL Exception when trying to add foreign key on table " + tableName + " exception: " + e.getMessage()); |
| } |
| } |
| |
| public void dropKey(Connection conn, String tableName, String key, boolean isForeignKey) |
| { |
| String alter_sql_str; |
| if (isForeignKey) { |
| alter_sql_str = "ALTER TABLE " + tableName + " DROP FOREIGN KEY " + key; |
| } else { |
| alter_sql_str = "ALTER TABLE " + tableName + " DROP KEY " + key; |
| } |
| try(PreparedStatement pstmt = conn.prepareStatement(alter_sql_str);) |
| { |
| pstmt.executeUpdate(); |
| logger.debug("Key " + key + " is dropped successfully from the table " + tableName); |
| } catch (SQLException e) { |
| logger.debug("Ignored SQL Exception when trying to drop " + (isForeignKey ? "foreign " : "") + "key " + key + " on table " + tableName + " exception: " + e.getMessage()); |
| |
| } |
| } |
| |
| public void dropPrimaryKey(Connection conn, String tableName) { |
| try(PreparedStatement pstmt = conn.prepareStatement("ALTER TABLE " + tableName + " DROP PRIMARY KEY ");) { |
| pstmt.executeUpdate(); |
| logger.debug("Primary key is dropped successfully from the table " + tableName); |
| } catch (SQLException e) { |
| logger.debug("Ignored SQL Exception when trying to drop primary key on table " + tableName + " exception: " + e.getMessage()); |
| } |
| } |
| |
| public void dropColumn(Connection conn, String tableName, String columnName) { |
| try (PreparedStatement pstmt = conn.prepareStatement("ALTER TABLE " + tableName + " DROP COLUMN " + columnName);){ |
| pstmt.executeUpdate(); |
| logger.debug("Column " + columnName + " is dropped successfully from the table " + tableName); |
| } catch (SQLException e) { |
| logger.warn("Unable to drop column " + columnName + " due to exception", e); |
| } |
| } |
| |
| public boolean columnExists(Connection conn, String tableName, String columnName) { |
| boolean columnExists = false; |
| try (PreparedStatement pstmt = conn.prepareStatement("SELECT " + columnName + " FROM " + tableName);){ |
| pstmt.executeQuery(); |
| columnExists = true; |
| } catch (SQLException e) { |
| logger.debug("Field " + columnName + " doesn't exist in " + tableName + " ignoring exception: " + e.getMessage()); |
| } |
| return columnExists; |
| } |
| |
| public String generateIndexName(String tableName, String... columnName) { |
| return String.format("i_%s__%s", tableName, StringUtils.join(columnName, "__")); |
| } |
| |
| public boolean indexExists(Connection conn, String tableName, String indexName) { |
| try (PreparedStatement pstmt = conn.prepareStatement(String.format("SHOW INDEXES FROM %s where Key_name = \"%s\"", tableName, indexName))) { |
| ResultSet result = pstmt.executeQuery(); |
| if (result.next()) { |
| return true; |
| } |
| } catch (SQLException e) { |
| logger.debug(String.format("Index %s doesn't exist, ignoring exception:", indexName, e.getMessage())); |
| } |
| return false; |
| } |
| |
| public void createIndex(Connection conn, String tableName, String indexName, String... columnNames) { |
| String stmt = String.format("CREATE INDEX %s ON %s (%s)", indexName, tableName, StringUtils.join(columnNames, ", ")); |
| logger.debug("Statement: " + stmt); |
| try (PreparedStatement pstmt = conn.prepareStatement(stmt)) { |
| pstmt.execute(); |
| logger.debug(String.format("Created index %s", indexName)); |
| } catch (SQLException e) { |
| logger.warn(String.format("Unable to create index %s", indexName), e); |
| } |
| } |
| |
| protected void closePreparedStatement(PreparedStatement pstmt, String errorMessage) { |
| try { |
| if (pstmt != null) { |
| pstmt.close(); |
| } |
| } catch (SQLException e) { |
| logger.warn(errorMessage, e); |
| } |
| } |
| } |