在Visual Studio中為表生成C＃類代碼

Question

我的Server Explore數據庫文件中有多個表。 我想為表生成類的自動代碼，因此所有具有屬性，構造函數和getter setter方法的類都會自動生成。

請告訴我這樣做的步驟。

Answer 1

不自動生成，但是使用sql和information_schema輸出類定義並不難，使用以表命名的類和要映射到屬性的列。 從那里你可以讓它生成創建，更新和刪除（我喜歡使用合並為SQL Server 2008下的包/更新）。

一次做一個，主要是字符串連接。 以下應該讓你開始......

declare @class varchar(max);

; with typemapping as (
 Select 'varchar' as DATA_TYPE, 'string' ctype
 union
 Select 'int', 'int'
)
select @class = isnull(@class + char(10), '') + 'public ' +
       tm.ctype +' ' + column_name +
       ' { get; set; }'
from information_schema.columns sc
   inner join typemapping tm on sc.data_type = tm.data_type
where table _name ='yourtbl'

print @class;

其余部分留給讀者，因為他們說主要是因為細節取決於你，而不是你可以使用支持變量的自動屬性，在屬性中放置標准邏輯，使值類型可以為空，在制作自己的代碼時發電機，使其適合您的模式/風格/需求。

Answer 2

如果您使用Entity Framework，請檢查本文的步驟：

從現有數據庫生成EF Code First模型類

Answer 3

我修改了上面的類並包含了所有缺少的方法

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;

using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Data.SqlClient;
using System.Configuration;
using System.Data.Common;

namespace CodeGenerator

{
    public partial class Form1 : Form
    {

    public Form1()
    {
        InitializeComponent();
    }

    private void btnGenerateCode_Click(object sender, EventArgs e)
    {
        string conStrJobsDB = ConfigurationSettings.AppSettings["jobsDBConStrKey"].ToString();
        CreateEntitiesFromDBTables(GetDataReader(conStrJobsDB));
    }

    private void CreateEntitiesFromDBTables(SqlDataReader dr)
    {
        if (dr != null)
        {
            string lstrOldTableName = string.Empty;
            StreamWriter swClassWriter = null;
            System.Text.StringBuilder sbFileName = null;
            System.Text.StringBuilder sbConstructorCode = null;
            System.Text.StringBuilder sbClassCode = null;
            FileInfo tableClassFile = null;

            while (dr.Read())
            {
                string lstrTableName = dr.GetString(0);
                string lstrAttributeName = dr.GetString(1);
                string lstrAttributeType = GetDotNetType(dr.GetString(2));

                //If table name is changed...
                if (lstrOldTableName != lstrTableName)
                {
                    //and stream writer is already opened so close this class generation...
                    if (swClassWriter != null)
                    {
                        CreateClassBottom(swClassWriter);
                        swClassWriter.Close();
                    }

                    sbFileName = new System.Text.StringBuilder(lstrTableName);
                    sbFileName.Append("Entity.cs");
                    tableClassFile = new FileInfo(tbPath.Text + "\\" + sbFileName.ToString());
                    swClassWriter = tableClassFile.CreateText();
                    CreateClassTop(swClassWriter, lstrTableName);

                    //sbConstructorCode = new System.Text.StringBuilder("\r\n\t/// \r\n\t" +
                    //     "/// User defined Contructor\r\n\t/// \r\n\tpublic ");
                    //sbConstructorCode = new System.Text.StringBuilder();
                    //sbConstructorCode.Append(lstrTableName);
                    //sbConstructorCode.Append("(");
                }
                else
                {
                    this.CreateClassBody(swClassWriter, lstrAttributeType, lstrAttributeName);
                    //sbConstructorCode.AppendFormat("{0} {1}, \r\n\t\t",
                    //   new object[] { lstrAttributeType, lstrAttributeName });
                    //sbConstructorCode.AppendFormat("\r\n\t\tthis._{0} = {0};",
                    //   new object[] { lstrAttributeName });
                }

                lstrOldTableName = lstrTableName;
                this.pBarMain.Increment(1);
            }

            MessageBox.Show("All classes generated.", "Done");
        }
    }

    private SqlDataReader GetDataReader(string conStrJobsDB)
    {
        SqlConnection connection = null;
        try
        {
            connection = new SqlConnection(conStrJobsDB);
            if (connection == null)
                return null;
            connection.Open();
            SqlCommand command = new System.Data.SqlClient.SqlCommand("exec spGenerateEntitiesFromTables", connection);
            SqlDataReader dr = command.ExecuteReader();
            if (dr.HasRows)
                return dr;
            else
                return null;
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
            return null;
        }
    }

    private string GetDotNetType(string dbColumnType)
    {
        string returnType = string.Empty;
        if (dbColumnType.Equals("nvarchar"))
            returnType = "string";
        else if (dbColumnType.Equals("varchar"))
            returnType = "string";
        else if (dbColumnType.Equals("int"))
            returnType = "int";
        else if (dbColumnType.Equals("bit"))
            returnType = "bool";
        else if (dbColumnType.Equals("bigint"))
            returnType = "long";
        else if (dbColumnType.Equals("binary"))
            returnType = "byte[]";
        else if (dbColumnType.Equals("char"))
            returnType = "string";
        else if (dbColumnType.Equals("date"))
            returnType = "DateTime";
        else if (dbColumnType.Equals("datetime"))
            returnType = "DateTime";
        else if (dbColumnType.Equals("datetime2"))
            returnType = "DateTime";
        else if (dbColumnType.Equals("datetimeoffset"))
            returnType = "DateTimeOffset";
        else if (dbColumnType.Equals("decimal"))
            returnType = "decimal";
        else if (dbColumnType.Equals("float"))
            returnType = "float";
        else if (dbColumnType.Equals("image"))
            returnType = "byte[]";
        else if (dbColumnType.Equals("money"))
            returnType = "decimal";
        else if (dbColumnType.Equals("nchar"))
            returnType = "char";
        else if (dbColumnType.Equals("ntext"))
            returnType = "string";
        else if (dbColumnType.Equals("numeric"))
            returnType = "decimal";
        else if (dbColumnType.Equals("nvarchar"))
            returnType = "string";
        else if (dbColumnType.Equals("real"))
            returnType = "double";
        else if (dbColumnType.Equals("smalldatetime"))
            returnType = "DateTime";
        else if (dbColumnType.Equals("smallint"))
            returnType = "short";
        else if (dbColumnType.Equals("smallmoney"))
            returnType = "decimal";
        else if (dbColumnType.Equals("text"))
            returnType = "string";
        else if (dbColumnType.Equals("time"))
            returnType = "TimeSpan";
        else if (dbColumnType.Equals("timestamp"))
            returnType = "DateTime";
        else if (dbColumnType.Equals("tinyint"))
            returnType = "byte";
        else if (dbColumnType.Equals("uniqueidentifier"))
            returnType = "Guid";
        else if (dbColumnType.Equals("varbinary"))
            returnType = "byte[]";

        return returnType;
    }

    private void CreateClassTop(StreamWriter sw, string lstrTableName)
    {
        System.Text.StringBuilder sb = null;
        sb = new StringBuilder("public class " + lstrTableName +"Entity\n{");
        sw.Write(sb.ToString());
    }

    private void CreateClassBody(StreamWriter sw, string lstrAttributeType, string lstrAttributeName)
    {
        System.Text.StringBuilder sb = null;
        sb = new StringBuilder("\n\rpublic " + lstrAttributeType + " " + lstrAttributeName + " { get; set; }");
        sw.Write(sb.ToString());
    }

    private void CreateClassBottom(StreamWriter sw)
    {
        System.Text.StringBuilder sb = null;
        sb = new StringBuilder("\n\n}");
        sw.Write(sb.ToString());
    }



}

}

Answer 4

你可以試試這樣的東西......

創建一個名為ModelCreator.cs的主類，它執行所有鍵操作。 此應用程序的入口點是“連接並創建”按鈕單擊事件。 它將觸發CreateConnectionString（）方法，該方法基本上從用戶獲取輸入並動態創建連接字符串

private void lbtnConnect_Click(object sender, System.EventArgs e)
{
   if (CreateConnectionString())
  CreateModelClassFiles(tcGetDataReader());
}

// <summary>
/// Get the SqlDataReader object
/// SqlDataReader
/// </summary>

public SqlDataReader tcGetDataReader()
{
SqlConnection connection = null;
try
{
  connection = GetConnection(SQL_CONN_STRING);
  if (connection == null)
  return null;
  SqlDataReader dr = SqlHelper.ExecuteReader(
         connection,
         CommandType.StoredProcedure,
         "getData");
if (dr.HasRows)
  return dr;
else
  return null;
 }
 catch(Exception ex)
 {
  MessageBox.Show(ex.Message);
  return null;
 }   
}

從數據庫中獲取表名，屬性及其類型

 CREATE PROCEDURE getData AS 
 select table_name, column_name, data_type
  from information_schema.columns
  where table_name in
  (
   select table_name
   from Information_Schema.Tables
   where Table_Type='Base Table'
  ) order by table_name
GO

主要方法，CreateModelClassFiles

  /// <summary>
 /// Create the Model class list iterating through the tables
/// </summary>
/// <param name="dr">Sql Data reader for the database schema</param>

    private void CreateModelClassFiles(SqlDataReader dr)
    {
     if (dr != null)
    {
    string lstrOldTableName = string.Empty;
    StreamWriter sw = null;
    System.Text.StringBuilder sb = null;
    System.Text.StringBuilder sbAttr = null;
    while(dr.Read())
    {
      string lstrTableName = dr.GetString(0);
      string lstrAttributeName = dr.GetString(1);
      string lstrAttributeType = GetSystemType(dr.GetString(2));
      if (lstrOldTableName != lstrTableName)
      {
        if (sw != null)
        {
          this.CreateClassBottom(sw, sb.ToString().TrimEnd(
                     new char[]{',', ' ', '\r', '\t', '\n'}),
                     sbAttr.ToString());
            sw.Close();
        }
        sb = new System.Text.StringBuilder(lstrTableName);
        sb.Append(".cs");
        FileInfo lobjFileInfo = new FileInfo(sb.ToString());
        sw = lobjFileInfo.CreateText();
        this.CreateClassTop(sw, lstrTableName);
        sb = new System.Text.StringBuilder("\r\n\t/// \r\n\t" + 
             "/// User defined Contructor\r\n\t/// \r\n\tpublic ");
        sbAttr = new System.Text.StringBuilder();
        sb.Append(lstrTableName);
        sb.Append("(");
      }
      else
      {
        this.CreateClassBody(sw, lstrAttributeType, lstrAttributeName);
        sb.AppendFormat("{0} {1}, \r\n\t\t", 
           new object[]{lstrAttributeType, lstrAttributeName});
        sbAttr.AppendFormat("\r\n\t\tthis._{0} = {0};", 
           new object[]{lstrAttributeName});
      }
      lstrOldTableName = lstrTableName;
      this.progressBarMain.Increment(1); 
    }
    MessageBox.Show("Done !!");
  }
}

調用此方法后，它會為您完成所有事情。

我希望它會幫助你......

Answer 5

我認為從表生成cs類的最簡單方法是對數據庫進行查詢，例如在SQL Server中可以使用此查詢：

declare @tblName sysname = 'SetYourTableName'
declare @ResultText varchar(max) = 'public class ' + @tblName + '
{'

select @ResultText = @ResultText + '
    public ' + ColumnType + NullableSign + ' ' + ColumnName + ' { get; set; }
'
from
(
    select 
        replace(col.name, ' ', '_') ColumnName,
        column_id ColumnId,
        case typ.name 
            when 'bigint' then 'long'
            when 'binary' then 'byte[]'
            when 'bit' then 'bool'
            when 'char' then 'string'
            when 'date' then 'DateTime'
            when 'datetime' then 'DateTime'
            when 'datetime2' then 'DateTime'
            when 'datetimeoffset' then 'DateTimeOffset'
            when 'decimal' then 'decimal'
            when 'float' then 'float'
            when 'image' then 'byte[]'
            when 'int' then 'int'
            when 'money' then 'decimal'
            when 'nchar' then 'string'
            when 'ntext' then 'string'
            when 'numeric' then 'decimal'
            when 'nvarchar' then 'string'
            when 'real' then 'double'
            when 'smalldatetime' then 'DateTime'
            when 'smallint' then 'short'
            when 'smallmoney' then 'decimal'
            when 'text' then 'string'
            when 'time' then 'TimeSpan'
            when 'timestamp' then 'DateTime'
            when 'tinyint' then 'byte'
            when 'uniqueidentifier' then 'Guid'
            when 'varbinary' then 'byte[]'
            when 'varchar' then 'string'
            else 'UNKNOWN_' + typ.name
        end ColumnType,
        case 
            when col.is_nullable = 1 and typ.name in ('bigint', 'bit', 'date', 'datetime', 'datetime2', 'datetimeoffset', 'decimal', 'float', 'int', 'money', 'numeric', 'real', 'smalldatetime', 'smallint', 'smallmoney', 'time', 'tinyint', 'uniqueidentifier') 
            then '?' 
            else '' 
        end NullableSign
    from sys.columns col
        join sys.types typ on
            col.system_type_id = typ.system_type_id AND col.user_type_id = typ.user_type_id
    where object_id = object_id(@tblName)
) t
order by ColumnId

set @ResultText = @ResultText  + '
}'

print @ResultText

然后運行此查詢並在Visual Studio中的新類中復制打印的結果文本

我希望能為你效勞

祝好運