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| dotnet下生成简单sql语句 |
| 作者：不详 来源：不详 发布时间：2006-8-14 8:28:54 发布人：chinazhan |
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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
做人要厚道，请注明转自chinazhan中国站长(www.ChinaZhan.com)。
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