用NVelocity写的一个简单的实体生成器

1、TestClass.aspx页面内容如下：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="TestClass.aspx.cs" Inherits="TestClass" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

2、cs代码如下：其中SQLHelper参照我写的SQLHelper类这篇文章，数据库连接字符串写在SQLHelper中，所以此时直接调用SQLHelper.ExecuteReader(“SQL语句”)就会返回SqlDataReader，数据库为SqlServer2000/2005/2008

代码

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Collections.Generic;
using System.Data.SqlClient;
using NVelocity.App;
using Commons.Collections;
using NVelocity;
using System.IO;
using NVelocity.Runtime;
using System.Text;
using AnalysisRuleFileDAL;

public partial class TestClass : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }


    #region 带SQLHelper的getCharptByChaptNo方法 根据ChapterNo获取Chapter信息
    /// <summary>
    /// 根据ChapterNo获取Chapter信息
    /// </summary>
    /// <param name="chptNo">ChapterNo</param>
    /// <returns>Chapter</returns>
    public  IList<SQLColem> getTableColByName(string name)
    {

        IList<SQLColem> list = new List<SQLColem>();
        string sqlStr = @"SELECT a.[name] as '字段名称', (case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) as '标识'
                        ,b.name '类型'
                        ,a.length '占用字节数'
                        ,(case when a.isnullable = 1 then '√'else '' end) '允许空'
                        ,isnull(e.text,'') '默认值'
                        ,cast(isnull(g.[value],'') as varchar(100)) AS '字段说明'
                        FROM syscolumns  a
                        left join systypes b
                        on  a.xtype = b.xusertype
                        left join syscomments e
                        on a.cdefault=e.id
                         left join sysproperties g
                        on a.id = g.id AND a.colid = g.smallid inner join sysobjects on sysobjects.id = a.id
                        where sysobjects.xtype='U' and sysobjects.name='" + name + "'";//sql 语句
        SqlDataReader rs = null;//定义SqlDataReader

        try
        {

            rs = SQLHelper.ExecuteReader(sqlStr);
            //根据sql 语句获得SqlDataReader

            //循环读取数据
            while (rs.Read())
            {
                SQLColem colom = new SQLColem();// 实例化Chapter
                StringBuilder str = new StringBuilder(Convert.ToString(rs[0]));

                string first = str.ToString().Substring(0,1);
                //首字母小写
                str = str.Replace(first.Substring(0, 1), first.Substring(0, 1).ToLower(), 0, 2);

                colom.Realname = str.ToString();// str.ToString();

                //首字母大写
                str = str.Replace(first.Substring(0, 1), first.Substring(0, 1).ToUpper(), 0, 2);

                colom.Bigname = str.ToString();
                string type = Convert.ToString(rs[2]);
                switch (type)
                {
                    case "char":
                    case "varchar":
                    case "nchar":
                    case "nvarchar":
                        type = "string";
                        break;
                    case "datetime":
                    case "smalldatetime":
                        type = "DateTime";
                        break;
                    case "decimal":
                    case "numeric":
                    case "money":
                    case "smallmoney":
                        type = "double";
                        break;
                    case "float":
                        type = "float";
                        break;
                    case "int":
                    case "smallint":
                    case "tinyint":
                    case "bit":
                        type = "int";
                        break;
                    default:
                        break;
                }

                colom.Type = type;
                list.Add(colom);

            }
        }
        catch (Exception)
        {
            rs.Dispose();
            rs.Close();
        }
        finally
        {
            rs.Dispose();
            rs.Close();
        }

        return list;
    }
    #endregion

    /// <summary>
    /// 生成事件
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void Button1_Click(object sender, EventArgs e)
    {
        //获取表名，生成Class类模板
        string tablename = this.TextBox1.Text.Trim();
        tempToClass(tablename);
    }


    /// <summary>
    ///  代码生成模板
    /// </summary>
    /// <param name="tablename"></param>
    private void tempToClass(string tablename)
    {
        StringBuilder str = new StringBuilder(tablename);

        String className = str.Replace(tablename.Substring(0, 1), tablename.Substring(0, 1).ToUpper(),0,1).ToString();
        IList<SQLColem> listUsers = new List<SQLColem>();

        listUsers = getTableColByName(tablename);

        Response.Write(listUsers.Count);

        IList<string> listAssembly = new List<string>();
        // 添加程序集名称
        listAssembly.Add("LibTest");

        //创建NVelocity引擎的实例对象
        VelocityEngine velocity = new VelocityEngine();
        //初始化该实例对象
        ExtendedProperties props = new ExtendedProperties();
        props.AddProperty(RuntimeConstants.RESOURCE_LOADER, "file");
        props.AddProperty(RuntimeConstants.FILE_RESOURCE_LOADER_PATH, Path.GetDirectoryName(Request.PhysicalPath) + "/Template/");
        props.AddProperty(RuntimeConstants.INPUT_ENCODING, "gb2312");
        props.AddProperty(RuntimeConstants.OUTPUT_ENCODING, "gb2312");
        velocity.Init(props);
        //从文件中读取模板
        Template temp = velocity.GetTemplate("tempClass.htm");
        VelocityContext vltContext = new VelocityContext();
        vltContext.Put("ClassName", className);
        vltContext.Put("ListUsers", listUsers);
        //合并模板
        StringWriter writer = new StringWriter();
        //velocity.MergeTemplate(context, writer);
        temp.Merge(vltContext, writer);

        //Template vltTemplate = velocity.GetTemplate("LibTest.Resources.Default.htm");
        //System.IO.StringWriter vltWriter = new System.IO.StringWriter();
        //temp.Merge(vltContext, vltWriter);
        //生成静态页
        using (StreamWriter writer2 = new StreamWriter(Server.MapPath("") + "/" + className + ".cs", false, Encoding.UTF8, 200))
        {
            writer2.Write(writer);
            writer2.Flush();
            writer2.Close();
        }
    }
}

3、SQLColem.cs文件内容如下：

代码

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

/// <summary>
///SQLColem 的摘要说明
/// </summary>
public class SQLColem
{
    public SQLColem()
    {
        //
        //TODO: 在此处添加构造函数逻辑
        //
    }

    private string realname;
    private string bigname;
    private string type;

    public string Type
    {
        get { return type; }
        set { type = value; }
    }



    public string Bigname
    {
        get { return bigname; }
        set { bigname = value; }
    }

    public string Realname
    {
        get { return realname; }
        set { realname = value; }
    }
}

posted @ 2010-03-09 16:44 why520crazy 阅读(442) 评论(0) 编辑收藏举报

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用NVelocity写的一个简单的实体生成器

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