Java tutorial
/******************************************************************************* * Copyright (c) 2015-2016, WSO2.Telco Inc. (http://www.wso2telco.com) All Rights Reserved. * <p> * WSO2.Telco Inc. licences 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 * <p> * http://www.apache.org/licenses/LICENSE-2.0 * <p> * 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.wso2telco.dep.ratecardservice.dao; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.ArrayList; import java.util.List; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import com.wso2telco.core.dbutils.DbUtils; import com.wso2telco.core.dbutils.exception.BusinessException; import com.wso2telco.core.dbutils.exception.ServiceError; import com.wso2telco.core.dbutils.util.DataSourceNames; import com.wso2telco.dep.ratecardservice.dao.model.CurrencyDTO; import com.wso2telco.dep.ratecardservice.util.DatabaseTables; public class CurrencyDAO { private final Log log = LogFactory.getLog(CurrencyDAO.class); public List<CurrencyDTO> getCurrencies() throws BusinessException { List<CurrencyDTO> currencies = new ArrayList<CurrencyDTO>(); Connection con = null; ResultSet rs = null; PreparedStatement ps = null; try { con = DbUtils.getDbConnection(DataSourceNames.WSO2TELCO_RATE_DB); if (con == null) { log.error("unable to open " + DataSourceNames.WSO2TELCO_RATE_DB + " database connection"); throw new BusinessException(ServiceError.SERVICE_ERROR_OCCURED); } StringBuilder query = new StringBuilder( "select currencyid, currencycode, currencydesc, createdby from "); query.append(DatabaseTables.CURRENCY.getTObject()); ps = con.prepareStatement(query.toString()); log.debug("sql query in getCurrencies : " + ps); rs = ps.executeQuery(); while (rs.next()) { CurrencyDTO currency = new CurrencyDTO(); currency.setCurrencyId(rs.getInt("currencyid")); currency.setCurrencyCode(rs.getString("currencycode")); currency.setCurrencyDescription(rs.getString("currencydesc")); currency.setCreatedBy(rs.getString("createdby")); currencies.add(currency); } } catch (SQLException e) { log.error("database operation error in getCurrencies : ", e); throw new BusinessException(ServiceError.SERVICE_ERROR_OCCURED); } catch (Exception e) { log.error("error in getCurrencies : ", e); throw new BusinessException(ServiceError.SERVICE_ERROR_OCCURED); } finally { DbUtils.closeAllConnections(ps, con, rs); } return currencies; } public CurrencyDTO addCurrency(CurrencyDTO currency) throws BusinessException { Connection con = null; PreparedStatement ps = null; ResultSet rs = null; Integer currencyId = 0; try { con = DbUtils.getDbConnection(DataSourceNames.WSO2TELCO_RATE_DB); if (con == null) { log.error("unable to open " + DataSourceNames.WSO2TELCO_RATE_DB + " database connection"); throw new BusinessException(ServiceError.SERVICE_ERROR_OCCURED); } StringBuilder query = new StringBuilder("insert into "); query.append(DatabaseTables.CURRENCY.getTObject()); query.append(" (currencycode, currencydesc, createdby)"); query.append(" values"); query.append(" (?, ?, ?)"); ps = con.prepareStatement(query.toString(), Statement.RETURN_GENERATED_KEYS); log.debug("sql query in addCurrency : " + ps); ps.setString(1, currency.getCurrencyCode()); ps.setString(2, currency.getCurrencyDescription()); ps.setString(3, currency.getCreatedBy()); ps.executeUpdate(); rs = ps.getGeneratedKeys(); while (rs.next()) { currencyId = rs.getInt(1); } currency.setCurrencyId(currencyId); } catch (SQLException e) { log.error("database operation error in addCurrency : ", e); throw new BusinessException(ServiceError.SERVICE_ERROR_OCCURED); } catch (Exception e) { log.error("error in addCurrency : ", e); throw new BusinessException(ServiceError.SERVICE_ERROR_OCCURED); } finally { DbUtils.closeAllConnections(ps, con, rs); } return currency; } public CurrencyDTO getCurrency(int currencyId) throws BusinessException { CurrencyDTO currency = null; Connection con = null; ResultSet rs = null; PreparedStatement ps = null; try { con = DbUtils.getDbConnection(DataSourceNames.WSO2TELCO_RATE_DB); if (con == null) { log.error("unable to open " + DataSourceNames.WSO2TELCO_RATE_DB + " database connection"); throw new BusinessException(ServiceError.SERVICE_ERROR_OCCURED); } StringBuilder query = new StringBuilder( "select currencyid, currencycode, currencydesc, createdby from "); query.append(DatabaseTables.CURRENCY.getTObject()); query.append(" where currencyid = ?"); ps = con.prepareStatement(query.toString()); log.debug("sql query in getCurrency : " + ps); ps.setInt(1, currencyId); rs = ps.executeQuery(); while (rs.next()) { currency = new CurrencyDTO(); currency.setCurrencyId(rs.getInt("currencyid")); currency.setCurrencyCode(rs.getString("currencycode")); currency.setCurrencyDescription(rs.getString("currencydesc")); currency.setCreatedBy(rs.getString("createdby")); } } catch (SQLException e) { log.error("database operation error in getCurrency : ", e); throw new BusinessException(ServiceError.SERVICE_ERROR_OCCURED); } catch (Exception e) { log.error("error in getCurrency : ", e); throw new BusinessException(ServiceError.SERVICE_ERROR_OCCURED); } finally { DbUtils.closeAllConnections(ps, con, rs); } return currency; } }