asp.net开发sql server转换成oracle的方法详解

<add key="OracleConnectionString" value="Password=123;User ID=SA;Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost )(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=ORCL)))"/>
 
 <add key="SqlServerConnectionString" value="server=localhost;database=Table;uid=sa;pwd=123"/>

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OracleClient;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace TransplantSQL
{
 public partial class Form1 : Form
 {
 public static string OracleConnectionString = System.Configuration.ConfigurationSettings.AppSettings["OracleConnectionString"];
 public static string SqlServerConnectionString = System.Configuration.ConfigurationSettings.AppSettings["SqlServerConnectionString"];
 public Form1()
 {
  InitializeComponent();
 }

 private void button2_Click(object sender, EventArgs e)
 {
  OracleConnection con = new OracleConnection(OracleConnectionString);
  try
  {
  con.Open();
  if (con.State == System.Data.ConnectionState.Open)
  {
   label5.Text = "连接成功";
  }
  }
  catch (OracleException se)
  {
  label5.Text = "连接失败";
  }

  finally
  {
  con.Close();
  }
 }

 private void button3_Click(object sender, EventArgs e)
 {
  SqlConnection con = new SqlConnection(SqlServerConnectionString);
  try
  {
  con.Open();
  if (con.State == System.Data.ConnectionState.Open)
  {
   label4.Text = "连接成功";
  }
  }
  catch (SqlException se)
  {
  label4.Text = "连接失败";
  }

  finally
  {
  con.Close();
  }
 }

 private void button1_Click(object sender, EventArgs e)
 {
  if (textBox1.Text == "")
  {
  DataTable tablenames = GetTableNames();
  foreach (DataRow item in tablenames.Rows)
  {
   string tablename = item["Name"].ToString().ToUpper();
   setdata(tablename);
  }
  }
  else
  {
  setdata(textBox1.Text);
  }

  label2.Text = "成功";
 }

 private static void setdata(string tablename)
 {
  // 查找有没有此表 如果没有就加
  int et = Convert.ToInt32(GetSingle("select count(*) from user_tables where table_name = '" + tablename + "'"));
  if (et <= 0)
  {
  DataTable tableInfo = GetTableInfo(tablename);
  string addtablesql = "CREATE TABLE {0}({1})";
  string cs = string.Empty;
  string biaoshi = string.Empty;
  foreach (DataRow citem in tableInfo.Rows)
  {
   cs += citem["字段名"].ToString();
   if (citem["类型"].ToString() == "int" || citem["类型"].ToString() == "bit" || citem["类型"].ToString() == "decimal")
   {
   cs += " NUMBER(" + (Convert.ToInt32(citem["长度"]) > 38 ? 38 : Convert.ToInt32(citem["长度"])) + (Convert.ToInt32(citem["小数位数"])>0?(","+Convert.ToInt32(citem["小数位数"])):"") + ")";
   }
   else if (citem["类型"].ToString() == "nvarchar" || citem["类型"].ToString() == "float")
   {
   cs += " VARCHAR2(" + (Convert.ToInt32(citem["长度"]) == -1 ? 4000 : Convert.ToInt32(citem["长度"]) * 2) + ")";
   }
   else if (citem["类型"].ToString() == "datetime")
   {
   cs += " DATE";
   }
   
   cs += citem["主键"].ToString() == "1" ? " primary key " : "";
   if (citem["标识"].ToString() == "1")
   {
   biaoshi = citem["字段名"].ToString();
   }
   cs += citem["默认值"].ToString() != "" ? " default " + citem["默认值"].ToString() + " " : "";
   cs += citem["允许空"].ToString() == "1" ? "," : " NOT NULL,";
  }
  cs = cs.Substring(0, cs.Length - 1);
  string tempsql = string.Format(addtablesql, tablename, cs);
  GetSingle(tempsql);
  if (biaoshi != string.Empty)
  {
   #region 判断是否有序列号 没有就创建 就是自动标识
   int xuliehao = 0;
   try
   {
   xuliehao = Convert.ToInt32(GetSingle(string.Format(@"select Seq_{0}.nextval from sys.dual", tablename)));
   }
   catch { }
   if (xuliehao <= 0)
   {
   #region 为了让序列不重复 取最大值为min 值
   int max = Convert.ToInt32(GetSingle(string.Format("select max({1}) from {0}", tablename, biaoshi),null));
   #endregion
   string sequence = string.Format(@"create sequence Seq_{0} start with {1} increment by 1 nomaxvalue minvalue 1 nocycle nocache", tablename, (max+1));//创建标识
   GetSingle(sequence);
   }
   #endregion
   #region 创建序列的触发器
   string chufaqisql = string.Format(@"CREATE OR REPLACE TRIGGER T_{0} 
      BEFORE INSERT ON {0} FOR EACH ROW WHEN (new.{1} is null)
      begin
      select Seq_{0}.nextval into:new.{1} from dual;
      end;", tablename, biaoshi);//创建触发器
   GetSingle(chufaqisql);
   #endregion
   #region 创建唯一约束
   //string weiyisql = string.Format(@"create unique index U_{0} on {0} ({1})", tablename, biaoshi);
   //GetSingle(weiyisql);
   #endregion
  }
  //int count = Convert.ToInt32(GetSingle("SELECT count(1) FROM " + tablename));
  //if (count < 10000)
  //{
  DataSet ds = Query("SELECT * FROM " + tablename);
  DataTable dt = ds.Tables[0];
  string columnsNames = string.Empty;
  string values = string.Empty;
  for (int i = 0; i < dt.Columns.Count; i++)
  {
   columnsNames += dt.Columns[i].ColumnName + ",";

  }
  columnsNames = columnsNames.Substring(0, columnsNames.Length - 1);
  foreach (DataRow dr in dt.Rows)
  {
   values = string.Empty;
   for (int i = 0; i < dt.Columns.Count; i++)
   {
   if (dr[i] != DBNull.Value)
   {
    if (dr[i].ToString() != "")
    {
    if (dt.Columns[i].DataType == Type.GetType("System.Double")
     || dt.Columns[i].DataType == Type.GetType("System.Decimal")
     || dt.Columns[i].DataType == Type.GetType("System.Int32"))
    {
     values += dr[i] + ",";
    }
    else if (dt.Columns[i].DataType == Type.GetType("System.String"))
    {
     values += "'" + dr[i].ToString().Replace('\'', '‘') + "',";
    }
    else if (dt.Columns[i].DataType == Type.GetType("System.DateTime"))
    {
     values += "to_date('" + dr[i] + "','YYYY/MM/DD HH24:MI:SS'),";
    }
    else if (dt.Columns[i].DataType == Type.GetType("System.Boolean"))
    {
     if (dr[i].ToString() == "False")
     {
     values += "0,";
     }
     else { values += "1,"; }
    }
    }
    else
    {
    values += "chr(32),";
    }
   }
   else
   {
    values += "NULL,";
   }
   }
   values = values.Substring(0, values.Length - 1);
   string osql = "Insert into " + tablename + "(" + columnsNames + ") values(" + values + ")";
   GetSingle(osql);
  }
  /