dotnet下生成简单sql语句

核心提示：static public void insert_sql(string tablename,Hashtable param_employeefield,string connstring) { //System.Web.HttpContext.Current.Response.Write("xxx&quo

static public void insert_sql(string tablename,Hashtable param_employeefield,string connstring)
  {
　 //System.Web.HttpContext.Current.Response.Write("xxx");
　 Hashtable ht_field=new Hashtable();
　 ht_field=getfieldtype(tablename,connstring); //表的字段
　 string field_value;
　 string field_type;//字段类型
　 string str_sql_fieldname="insert into " + "tablename("; //插入语句
　 string str_sql_fieldvalue=" values(";
　 string str_sql;
　 foreach(object obj_param in param_employeefield)
　 {
　  field_type=ht_field[obj_param.ToString()].ToString();//获取 int型 or varchar型等等
　  field_value=param_employeefield[obj_param].ToString();
　  str_sql_fieldname+=param_employeefield[obj_param].ToString()+",";
　  str_sql_fieldvalue+=judgetype(field_type,field_value)+",";
　 }

　 str_sql_fieldname=str_sql_fieldname.Substring(1,str_sql_fieldname.Length)+")";
　 str_sql_fieldvalue=str_sql_fieldvalue.Substring(1,str_sql_fieldvalue.Length)+")";
　 str_sql=str_sql_fieldname+str_sql_fieldvalue;
　 nsn.core.SqlHelper.ExecuteNonQuery(connstring,CommandType.Text,str_sql);
  }

  static public void update_sql(string tablename,Hashtable param_employeefield,string connstring)
  {
　 Hashtable ht_field=new Hashtable();
　 ht_field=getfieldtype(tablename,connstring);
　 string field_value;
　 string field_type;
　 StringBuilder str_sql  = new StringBuilder();　
　 str_sql.Append("update " + "tablename set ");
　 string sql1;
　 foreach(object obj_param in param_employeefield)
　 {
　  field_type=ht_field[obj_param.ToString()].ToString();
　  field_value=param_employeefield[obj_param].ToString();
　  str_sql.Append(param_employeefield[obj_param].ToString()+"="+judgetype(field_type,field_value)+",");
　 }
　 sql1=str_sql.ToString().Substring(1,str_sql.ToString().Length-1)+" where";
　 nsn.core.SqlHelper.ExecuteNonQuery(connstring,CommandType.Text,sql1);
  }

  static PRotected string judgetype(string field_type,string field_value)
  {
　 string str_value;
　 switch(field_type)
　 {
　  case "int":　　 str_value=field_value;
　　 break;
　  case "varchar": str_value="'"+field_value+"'";
　　 break;
　  case "ntext":　 str_value="'"+field_value+"'";
　　 break;
　  case "datetime":str_value="'"+field_value+"'";
　　 break;
　  case "tinyint": str_value=field_value;
　　 break;
　  case "smallint": str_value=field_value;
　　 break;
　 }
　 return(field_type);
  }

  static protected Hashtable getfieldtype(string tablename,string connstring)
  {
　 DataSet ds = new DataSet();
　 Hashtable ht_field=new Hashtable();
　 SqlParameter[] paramsToStore = new SqlParameter[1];
　 paramsToStore[0] = new SqlParameter("@tablename", SqlDbType.NVarChar);
　 paramsToStore[0].Direction=ParameterDirection.Input;
　 paramsToStore[0].Value=tablename;
　 
　 ds=nsn.core.SqlHelper.ExecuteDataset(connstring,CommandType.StoredProcedure,"main_searchtable",paramsToStore);
　 DataTable tbl=ds.Tables[0];
　 foreach(DataRow row in tbl.Rows)
　 {
　 
　  ht_field.Add(row["字段名"].ToString(),row["类型"].ToString());
　  //System.Web.HttpContext.Current.Response.Write(row["字段名"].ToString());
　 }
　 return(ht_field);
  }

main_searchtable 存储过程是
CREATE PROCEDURE main_searchtable
@tablename nvarchar(50)
AS 
 
SELECT　
 表名=case when a.colorder=1 then d.name else '' end, 
 表说明=case when a.colorder=1 then isnull(f.value,'') else '' end, 
 字段序号=a.colorder, 
 字段名=a.name, 
 标识=case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end, 
 类型=b.name 
 
　
FROM syscolumns a 
 left join systypes b on a.xtype=b.xusertype 
 inner join sysobjects d on a.id=d.id  and d.xtype='U' and  d.name<>'dtproperties' 
 
 left join sysproperties f on d.id=f.id and f.smallid=0 
 
where d.name=@tablename　  --如果只查询指定表,加上此条件 
order by a.id,a.colorder
GO

http://liuxiaoyi666.cnblogs.com/archive/2006/05/28/411082.html