DBUtils tool class writing

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import com.mchange.v2.c3p0.ComboPooledDataSource;

/**
 * database tool class
 *
 * @author -
 *
 */
public class DBUtils {
    
    
    private static final ComboPooledDataSource POOL = new ComboPooledDataSource();

    /**
     * privatization constructor
     *
     * @author -
     */
    private DBUtils() {
    
    
    }

    /**
     * get ComboPooledDataSource object
     *
     * @return
     * @author -
     */
    public static ComboPooledDataSource getDataSource() {
    
    
        return POOL;
    }

    /**
     * get Connection object
     *
     * @return Connection
     * @author -
     */
    public static Connection getConnection() {
    
    
        Connection conn = null;
        try {
    
    
            conn = POOL.getConnection();
        } catch (SQLException e) {
    
    
            e.printStackTrace();
        }
        return conn;
    }

    /**
     * close database connection
     *
     * @author -
     * @param rs
     * @param pstmt
     * @param conn
     */
    public static void connectionColse(ResultSet rs, PreparedStatement pstmt, Connection conn) {
    
    
        try {
    
    
            if (rs != null) {
    
    
                rs.close();
            }
            if (pstmt != null) {
    
    
                pstmt.close();
            }
            if (conn != null) {
    
    
                conn.close();
            }
        } catch (SQLException e) {
    
    
            e.printStackTrace();
        }
    }

    /**
     * get an QueryRunner object
     *
     * @author -
     * @param pool
     * @return QueryRunner
     */
    public static QueryRunner getRunner() {
    
    
        QueryRunner runner = new QueryRunner(POOL);
        return runner;
    }

    /**
     * select data from database
     *
     * @author -
     * @param runner
     * @param sql
     * @param blh
     * @throws SQLException
     */
    public static <T> void ShowData(QueryRunner runner, String sql, BeanListHandler<T> blh) throws SQLException {
    
    
        List<T> queryList = runner.query(sql, blh);
        for (Object obj : queryList) {
    
    
            System.out.println(obj);
        }
    }

    /**
     * select data from database and return bean object
     *
     * @param runner
     * @param sql
     * @param bh
     * @return T
     * @throws SQLException
     */
    public static <T> T SelectData(QueryRunner runner, String sql, BeanHandler<T> bh, Object... obj)
            throws SQLException {
    
    
        T t = runner.query(sql, bh, obj);
        return t;
    }

    /**
     * update data and return the number of affected rows
     *
     * @param runner
     * @param sql
     * @param params
     * @return int
     * @throws SQLException
     */
    public static int UpdateData(QueryRunner runner, String sql, Object... params) throws SQLException {
    
    
        int count = runner.update(sql, params);
        return count;
    }

    /**
     * close database connection pool
     *
     * @author -
     * @param pool
     */
    public static void poolColse(ComboPooledDataSource pool) {
    
    
        if (pool != null) {
    
    
            pool.close();
        }
    }
}