C# ASP.NET连接PostgreSQL 数据库DBHelper

 public class PGDBHelper
    {

        public static string pgsqlConnection = ConfigurationManager.ConnectionStrings["pgsqlConnection"].ConnectionString.ToString();
        /// 

        /// select查询
        /// 
        /// 
        /// 
        public static DataSet PostgreTable(string sql)
        {
            DataSet ds = new DataSet();
            using (NpgsqlConnection conn = new NpgsqlConnection(pgsqlConnection))
            {

                conn.Open();
                NpgsqlCommand cmd = new NpgsqlCommand(sql, conn);
                NpgsqlDataAdapter sda = new NpgsqlDataAdapter(cmd);

                sda.Fill(ds);

            }

            return ds;
        }

        /// 

        /// 执行sql返回是否成功
        /// 
        /// 
        /// 
        public static bool PostgreExecuQuery(string StrText)
        {
            bool bools = false;

            using (NpgsqlConnection conn = new NpgsqlConnection(pgsqlConnection))
            {
                conn.Open();
                NpgsqlCommand cmd = new NpgsqlCommand(StrText, conn);
                int n = cmd.ExecuteNonQuery();
                conn.Close();
                if (n > 0) bools = true;
                else bools = false;
            }

            return bools;
        }

        /// 

        /// 执行sql返回字符
        /// 
        /// 
        /// 
        /// 
        public static string GetpostgreExecuteScalar(string strText, string StrConnection)
        {
            using (NpgsqlConnection conn = new NpgsqlConnection(StrConnection))
            {
                conn.Open();
                NpgsqlCommand cmd = new NpgsqlCommand(strText, conn);
                string PostgreScalar = cmd.ExecuteScalar().ToString();
                if (PostgreScalar != null || !string.IsNullOrEmpty(PostgreScalar))
                    return PostgreScalar;
                else return null;
            }
        }
    }

下载两个已经封装好的dll类库
Npgsql.dll
Mono.Security.dll

引用命名空间
using Npgsql;

开始一段空间数据库旅程