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package eu.dnetlib.validator.commons.dao;
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import java.sql.Connection;
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import java.sql.PreparedStatement;
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import java.sql.SQLException;
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import javax.sql.DataSource;
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import org.apache.log4j.Logger;
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import org.springframework.jdbc.datasource.DataSourceUtils;
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public abstract class AbstractDAO<T> implements DAO<T> {
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protected DataSource datasource = null;
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protected abstract PreparedStatement getUpdateStatement(T t,Connection con) throws SQLException;
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protected abstract PreparedStatement getInsertStatement(T t,Connection con) throws SQLException;
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protected abstract PreparedStatement getDeleteStatement(int id,Connection con) throws SQLException;
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protected abstract int getLastId() throws SQLException, DaoException;
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protected static Logger logger = Logger.getLogger(AbstractDAO.class);
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@Override
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public Integer save(T t) throws DaoException {
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Connection con = null;
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PreparedStatement stmt = null;
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Integer retId = -1;
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logger.debug("Accessing DB to save/update ");
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try {
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con = getConnection();
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stmt = getUpdateStatement(t,con);
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if (stmt.executeUpdate() == 0) {
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stmt.close();
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stmt = getInsertStatement(t,con);
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stmt.executeUpdate();
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retId=this.getLastId();
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}
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} catch (SQLException e) {
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logger.error("Error while accessing DB to save/update: ", e);
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throw new DaoException(e);
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} finally {
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if (stmt != null) {
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try {
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stmt.close();
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} catch (SQLException e) {
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logger.error("Error while accessing DB to save/update: ", e);
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throw new DaoException(e);
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}
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}
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}
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return retId;
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}
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@Override
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public String delete(int id) throws DaoException {
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Connection con = null;
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PreparedStatement stmt = null;
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logger.debug("Accessing DB to delete ");
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try {
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con = getConnection();
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stmt = getDeleteStatement(id,con);
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if (stmt.executeUpdate() == 0) {
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stmt.close();
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}
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} catch (Exception e) {
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logger.error("Error while accessing DB to delete: ", e);
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throw new DaoException(e);
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} finally {
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if (stmt != null) {
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try {
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stmt.close();
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} catch (Exception e) {
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logger.error("Error while accessing DB to delete: ", e);
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throw new DaoException(e);
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}
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}
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}
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return null;
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}
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public Connection getConnection() throws DaoException {
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try {
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Connection conn = DataSourceUtils.getConnection(datasource);
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return conn;
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} catch (Exception e){
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throw new DaoException(e);
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}
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}
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public DataSource getDatasource() {
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return datasource;
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}
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public void setDatasource(DataSource datasource) {
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this.datasource = datasource;
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}
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}
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