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.CategoryDTO; import com.wso2telco.dep.ratecardservice.util.DatabaseTables; public class CategoryDAO { private final Log log = LogFactory.getLog(CategoryDAO.class); public List<CategoryDTO> getCategories() throws BusinessException { List<CategoryDTO> categories = new ArrayList<CategoryDTO>(); 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 categoryid, categoryname, categorycode, categorydesc, createdby from "); query.append(DatabaseTables.CATEGORY.getTObject()); ps = con.prepareStatement(query.toString()); log.debug("sql query in getCategories : " + ps); rs = ps.executeQuery(); while (rs.next()) { CategoryDTO category = new CategoryDTO(); category.setCategoryId(rs.getInt("categoryid")); category.setCategoryName(rs.getString("categoryname")); category.setCategoryCode(rs.getString("categorycode")); category.setCategoryDescription(rs.getString("categorydesc")); category.setCreatedBy(rs.getString("createdby")); categories.add(category); } } catch (SQLException e) { log.error("database operation error in getCategories : ", e); throw new BusinessException(ServiceError.SERVICE_ERROR_OCCURED); } catch (Exception e) { log.error("error in getCategories : ", e); throw new BusinessException(ServiceError.SERVICE_ERROR_OCCURED); } finally { DbUtils.closeAllConnections(ps, con, rs); } return categories; } public CategoryDTO addCategory(CategoryDTO category) throws BusinessException { Connection con = null; PreparedStatement ps = null; ResultSet rs = null; Integer categoryId = 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.CATEGORY.getTObject()); query.append(" (categoryname, categorycode, categorydesc, createdby)"); query.append(" values"); query.append(" (?, ?, ?, ?)"); ps = con.prepareStatement(query.toString(), Statement.RETURN_GENERATED_KEYS); log.debug("sql query in addCategory : " + ps); ps.setString(1, category.getCategoryName()); ps.setString(2, category.getCategoryCode()); ps.setString(3, category.getCategoryDescription()); ps.setString(4, category.getCreatedBy()); ps.executeUpdate(); rs = ps.getGeneratedKeys(); while (rs.next()) { categoryId = rs.getInt(1); } category.setCategoryId(categoryId); } catch (SQLException e) { log.error("database operation error in addCategory : ", e); throw new BusinessException(ServiceError.SERVICE_ERROR_OCCURED); } catch (Exception e) { log.error("error in addCategory : ", e); throw new BusinessException(ServiceError.SERVICE_ERROR_OCCURED); } finally { DbUtils.closeAllConnections(ps, con, rs); } return category; } public CategoryDTO getCategory(int categoryId) throws BusinessException { CategoryDTO category = 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 categoryid, categoryname, categorycode, categorydesc, createdby from "); query.append(DatabaseTables.CATEGORY.getTObject()); query.append(" where categoryid = ?"); ps = con.prepareStatement(query.toString()); log.debug("sql query in getCategory : " + ps); ps.setInt(1, categoryId); rs = ps.executeQuery(); while (rs.next()) { category = new CategoryDTO(); category.setCategoryId(rs.getInt("categoryid")); category.setCategoryName(rs.getString("categoryname")); category.setCategoryCode(rs.getString("categorycode")); category.setCategoryDescription(rs.getString("categorydesc")); category.setCreatedBy(rs.getString("createdby")); } } catch (SQLException e) { log.error("database operation error in getCategory : ", e); throw new BusinessException(ServiceError.SERVICE_ERROR_OCCURED); } catch (Exception e) { log.error("error in getCategory : ", e); throw new BusinessException(ServiceError.SERVICE_ERROR_OCCURED); } finally { DbUtils.closeAllConnections(ps, con, rs); } return category; } }