using CnasSynchronousCommon;
using CnasSynchronusDAL;
using CnasSynchrousModel;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CNAS_DBSync
{
    public class SelectTableType
    {
        private static string connectionStr = "";
        public static DataTable MySqlsec(string strTableName)
        {
            MySQLDAL mysql = new MySQLDAL();
            DataTable tb = mysql.GetTableTypeAndLenth(strTableName);
            return tb;
        }

        public static DataTable Sqlserversec(string strTableName, SyncInstrumentItemInfo t)
        {

            DataTable dt = new DataTable();
            try
            {
                if (t.SyncInstrumentDSInfo.Host != "")
                    connectionStr = $"Data Source = {t.SyncInstrumentDSInfo.Host}; Initial Catalog = {t.SyncInstrumentDSInfo.ServerName}; User Id = {t.SyncInstrumentDSInfo.UserId}; Password = {t.SyncInstrumentDSInfo.UserPwd};";

                string sql = string.Format(@"SELECT 
    c.name AS ColumnName,
    t.name AS DataType,
    c.max_length AS MaxLength,
    c.is_nullable AS IsNullable,
    c.default_object_id AS DefaultObjectId,
	 ep.value AS remark
FROM 
    sys.columns c
JOIN 
    sys.types t ON c.user_type_id = t.user_type_id
	LEFT JOIN 
    sys.extended_properties ep
	ON 
    c.object_id = ep.major_id
    AND c.column_id = ep.minor_id
    AND ep.name = 'MS_Description' -- 备注的属性名称
WHERE 
    c.object_id = OBJECT_ID('{0}'); ", strTableName); //查询字符串
                dt = GetDataTable(sql, new SqlParameter[] { });

            }
            catch (Exception ex)
            {
                //发生异常，写入日志
                AppLog.Error(ex.Message);
            }
            return dt;

        }

        /// <summary>
        /// 查询操作
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public static DataTable GetDataTable(string sql, params SqlParameter[] sp)
        {
            using (SqlConnection conn = new SqlConnection(connectionStr))
            {
                conn.Open();
                using (SqlDataAdapter sda = new SqlDataAdapter(sql, conn))
                {
                    sda.SelectCommand.Parameters.AddRange(sp);
                    DataTable dt = new DataTable();
                    sda.Fill(dt);
                    return dt;
                }
            }
        }


        public static DataTable PostgreSql(string strTableName)
        {

            DataTable dt = new DataTable();
            string strSql = string.Format(@"SELECT
                                                a.attname as ColumnName,
                                                format_type(a.atttypid, a.atttypmod) as DataType,
                                                a.attnotnull as 非空,
                                                col_description(a.attrelid, a.attnum) as remark
                                                FROM
                                                pg_class as c, pg_attribute as a
                                                where
                                                a.attrelid = c.oid
                                                and
                                                a.attnum > 0
                                                and
                                                c.relname = '{0}'; ", strTableName);
            try
            {
                dt = PostgreSQLHelper.ExecuteDataSet(strSql).Tables[0];
            }
            catch (Exception ex)
            {
                AppLog.Error(ex.Message);
            }
            return dt;


        }

        public static DataTable DmSql(string strTableName)
        {

            DataTable dt = new DataTable();
            string strSql = string.Format(@"SELECT 
    a.COLUMN_NAME AS ColumnName,
    b.COMMENTS AS remark,
    a.DATA_TYPE || CASE
        WHEN a.DATA_TYPE IN('VARCHAR', 'CHAR') THEN '(' || a.DATA_LENGTH || ')'
        WHEN a.DATA_TYPE IN('DECIMAL', 'NUMERIC') THEN '(' || a.DATA_PRECISION || ',' || a.DATA_SCALE || ')'
        ELSE ''
    END AS DataType
FROM
    ALL_TAB_COLUMNS a
LEFT JOIN
    ALL_COL_COMMENTS b
    ON a.OWNER = b.OWNER
    AND a.TABLE_NAME = b.TABLE_NAME
    AND a.COLUMN_NAME = b.COLUMN_NAME
WHERE
    a.TABLE_NAME = '{0}'

ORDER BY
    a.COLUMN_ID;", strTableName);
            try
            {
                dt = DamengHelper.ExecuteDataSet(strSql).Tables[0];
            }
            catch (Exception ex)
            {
                AppLog.Error(ex.Message);
            }
            return dt;


        }
    }
}