SqlHelper分享

using Model;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DAL
{
    public static class SqlHelper
    {
        //public static string conStr = ConfigurationManager.ConnectionStrings["conStr"].ConnectionString.ToString();
        public static string conStr = "server=***;uid=sa;pwd=******;database=TripMaster";

        /// <summary>
        /// 用一个sql语句和可变的SQLParameter数组增删改数据库的数据并且返回受影响的行数，当受影响行数为0时返回的是负数
        /// </summary>
        /// <param name="cmdStr">sql语句</param>
        /// <param name="sqlParams">params形的变量数组</param>
        /// <returns>返回受影响的行数</returns>
        public static int ExecuteNonQuery(string cmdStr, params SqlParameter[] sqlParams)
        {
            using (SqlConnection con = new SqlConnection(conStr))
            {
                using (SqlCommand cmd = new SqlCommand(cmdStr, con))
                {
                    if (sqlParams != null)
                    {
                        cmd.Parameters.AddRange(sqlParams);
                    }
                    con.Open();
                    return cmd.ExecuteNonQuery();

                }
            }
        }

        /// <summary>
        /// 使用一个sql语句来查找数据库，返回查找数据的第一行第一列的数据
        /// </summary>
        /// <param name="cmdStr">sql语句</param>
        /// <param name="sqlParams">params形式的SqlParameters数组</param>
        /// <returns>返回所查找信息第一行第一列的数据，类型未知，所以用object接收</returns>
        public static object ExecuteScalar(string cmdStr, params SqlParameter[] sqlParams)
        {
            using (SqlConnection con = new SqlConnection(conStr))
            {
                using (SqlCommand cmd = new SqlCommand(cmdStr, con))
                {
                    if (sqlParams != null)
                    {
                        cmd.Parameters.AddRange(sqlParams);
                    }
                    con.Open();
                    return cmd.ExecuteScalar();

                }
            }
        }

        /// <summary>
        /// 使用一个sql语句查找数据返回一个dataTable；
        /// </summary>
        /// <param name="cmdStr">sql语句</param>
        /// <param name="sqlParams">params形式的SqlParameter数组</param>
        /// <returns>返回一张表DataTable</returns>
        public static DataTable ExecuteDataTable(string cmdStr, params SqlParameter[] sqlParams)
        {
            using (SqlConnection con = new SqlConnection(conStr))
            {
                using (SqlCommand cmd = new SqlCommand(cmdStr, con))
                {
                    con.Open();
                    if (sqlParams != null)
                    {
                        cmd.Parameters.AddRange(sqlParams);
                    }
                    using (SqlDataAdapter dataAdapter = new SqlDataAdapter(cmd))
                    {
                        DataTable dt = new DataTable();
                        dataAdapter.Fill(dt);
                        return dt;
                    }
                }

            }
        }

        /// <summary>
        /// 使用一个sql语句查找数据库信息，返回一个SqldataReader，封装这一个方法时要注意，cmd是可以关闭的，
        /// 而适配器在读取数据的时候con是不能关闭的
        /// 所以要在适配器的创建里面加上参数System.Data.CommandBehavior.CloseConnection，
        /// 这个参数的意思是当适配器关闭的时候顺便也关闭con，就是con直到不再从数据库读取数据时才可以关闭
        /// </summary>
        /// <param name="cmdStr">sql语句</param>
        /// <param name="sqlParams">params形式的SqlParameters数组</param>
        /// <returns>返回一个SqlDatareader可以进行读取数据</returns>
        public static SqlDataReader ExecuteReader(string cmdStr, params SqlParameter[] sqlParams)
        {
            SqlConnection con = new SqlConnection(conStr);
            using (SqlCommand cmd = new SqlCommand(cmdStr, con))
            {
                if (sqlParams != null)
                {
                    cmd.Parameters.AddRange(sqlParams);
                }
                try
                {
                    con.Open();
                    SqlDataReader reader = cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
                    return reader;
                }
                catch
                {
                    con.Close();
                    con.Dispose();
                    throw;//不抛出这个就会报错
                }
                finally
                {

                }
            }

        }

        public static int ExcuteAddMany(string cmdStr, string[] tempArray, params SqlParameter[] sqlParams)
        {
            DataTable table = new DataTable();
            table.Columns.Add("Name");
            table.Columns.Add("LayerNum");

            for (int i=0; i<tempArray.Length;i++)
            {
                DataRow row = table.NewRow();
                row["Name"] = tempArray[i].ToString();
                row["LayerNum"] = 0;
                table.Rows.Add(row);
            }

            string connectionStr = "server=PC-201701130905\\B;uid=sa;pwd=s07j08b11;database=TripMaster";
            using (SqlBulkCopy bulkCopy = new SqlBulkCopy(connectionStr))
            {
                bulkCopy.BatchSize = table.Rows.Count;
                bulkCopy.DestinationTableName = "SQLBulkCopyTest";//在插入的目标表
                                                                  //DataTable列名与数据库列名的映射
                bulkCopy.ColumnMappings.Add("LayerNum", "LayerNum");
                bulkCopy.ColumnMappings.Add("Name", "Name");
                bulkCopy.WriteToServer(table);//写入到数据库中
            }
            return 1;

        }

    }
}