memberinfodao.java

用jsp,java写的在线购物系统

// Decompiled by Jad v1.5.7g. Copyright 2000 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/SiliconValley/Bridge/8617/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi 
// Source File Name:   MemberInfoDAO.java

package mediastore.dao;

import java.sql.*;
import mediastore.common.DBConnection;
import mediastore.util.StrUtility;

public class MemberInfoDAO
{

    public MemberInfoDAO()
    {
    }

    public float getDiscount(int memberId)
    {
        float discount;
        discount = 1.0F;
        DBConnection dbc = null;
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        String strSQL = null;
        try
        {
            dbc = new DBConnection();
            conn = dbc.getDBConnection();
            stmt = conn.createStatement();
            strSQL = "SELECT Discount FROM TabMemberInfo WHERE MemberId=" + memberId;
            rs = stmt.executeQuery(strSQL);
            if(rs.next())
                discount = rs.getFloat(1);
            rs.close();
            rs = null;
        }
        catch(Exception exception) { }
        finally
        {
            try
            {
                if(rs != null)
                    rs.close();
                if(stmt != null)
                    stmt.close();
                if(conn != null)
                    dbc.closeDBConnection(conn);
            }
            catch(SQLException e) { }
        }
        return discount;
    }

    public int insertNewMember(String memberName)
    {
        int nRet;
        nRet = 0;
        DBConnection dbc = null;
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        String strSQL = null;
        int max = 0;
        try
        {
            dbc = new DBConnection();
            conn = dbc.getDBConnection();
            conn.setAutoCommit(false);
            stmt = conn.createStatement();
            strSQL = "SELECT MAX(MemberId) FROM TabMemberInfo";
            rs = stmt.executeQuery(strSQL);
            if(rs.next())
                max = rs.getInt(1);
            max++;
            strSQL = "INSERT INTO TabMemberInfo( MemberId, MemberName, Discount, CreateTime ) values (" + max + ", '" + StrUtility.replaceString(memberName, "'", "''") + "', 1, getdate())";
            nRet = stmt.executeUpdate(strSQL);
            if(nRet != 1)
            {
                nRet = -1;
                throw new Exception("插入新记录错误");
            }
            conn.commit();
        }
        catch(Exception e)
        {
            nRet = -1;
        }
        finally
        {
            try
            {
                if(stmt != null)
                    stmt.close();
                if(conn != null)
                    dbc.closeDBConnection(conn);
            }
            catch(SQLException ex) { }
        }
        return nRet;
    }

    public int deleteOne(int memberId)
    {
        int nRet;
        nRet = 0;
        DBConnection dbc = null;
        Connection conn = null;
        Statement stmt = null;
        try
        {
            dbc = new DBConnection();
            conn = dbc.getDBConnection();
            String strSQL = "DELETE FROM TabMemberInfo WHERE MemberId=" + memberId + " ";
            stmt = conn.createStatement();
            nRet = stmt.executeUpdate(strSQL);
            if(nRet != 1)
                nRet = -1;
        }
        catch(Exception e)
        {
            e.printStackTrace();
            nRet = -1;
        }
        finally
        {
            try
            {
                if(stmt != null)
                    stmt.close();
                if(conn != null)
                    dbc.closeDBConnection(conn);
            }
            catch(SQLException e) { }
        }
        return nRet;
    }

    public int updateDis(int memberId, String method, float point)
    {
        int nRet;
        nRet = 0;
        DBConnection dbc = null;
        Connection conn = null;
        Statement stmt = null;
        String strSQL = null;
        float oldDiscount = getDiscount(memberId);
        float newDiscount = oldDiscount;
        if("add".equals(method))
            newDiscount = oldDiscount + point;
        else
        if("sub".equals(method))
            newDiscount = oldDiscount - point;
        else
        if("none".equals(method))
            newDiscount = point;
        try
        {
            dbc = new DBConnection();
            conn = dbc.getDBConnection();
            stmt = conn.createStatement();
            strSQL = "UPDATE TabMemberInfo SET Discount = " + newDiscount + " WHERE MemberId = " + memberId;
            stmt.executeUpdate(strSQL);
        }
        catch(Exception e)
        {
            nRet = -1;
        }
        finally
        {
            try
            {
                if(stmt != null)
                    stmt.close();
                if(conn != null)
                    dbc.closeDBConnection(conn);
            }
            catch(SQLException e) { }
        }
        return nRet;
    }
}