using MySql.Data.MySqlClient;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Text;
public class MySqlDbHelper
{
#region 私有变量
private const string defaultConfigKeyName = "MySqlConnection";//连接字符串 Database='数据库';Data Source='IP地址';User Id='sa';Password='sa';pooling=true
private string connectionString;
private string providerName;
#endregion
#region 构造函数
/// <summary>
/// 默认构造函数(DbHelper)
/// </summary>
public MySqlDbHelper()
{
this.connectionString = ConfigurationManager.ConnectionStrings[defaultConfigKeyName].ConnectionString;
this.providerName = ConfigurationManager.ConnectionStrings[defaultConfigKeyName].ProviderName;
}
/// <summary>
/// DbHelper构造函数
/// </summary>
/// <param name="keyName">连接字符串名</param>
public MySqlDbHelper(string keyName)
{
this.connectionString = ConfigurationManager.ConnectionStrings[keyName].ConnectionString;
this.providerName = ConfigurationManager.ConnectionStrings[keyName].ProviderName;
}
#endregion
public int ExecuteNonQuery(string sql, params  MySqlParameter[] parameters)
{
int res = 0;
using (MySqlConnection con = new MySqlConnection(connectionString))
{
con.Open();
using (MySqlCommand cmd = new MySqlCommand(sql, con))
{
foreach (MySqlParameter parameter in parameters)
{
cmd.Parameters.Add(parameter);
}
try
{
res = cmd.ExecuteNonQuery();
}
catch
{
res = -1;
}
}
}
return res;
}
public object GetExeScalar(string sql, params MySqlParameter[] parameters)
{
object res = null;
using (MySqlConnection con = new MySqlConnection(connectionString))
{
con.Open();
using (MySqlCommand cmd = new MySqlCommand(sql, con))
{
foreach (MySqlParameter parameter in parameters)
{
cmd.Parameters.Add(parameter);
}
res = cmd.ExecuteScalar();
}
}
return res;
}
public DataTable GetDataTable(string sql, params MySqlParameter[] parameters)
{
DataSet dataset = new DataSet();
using (MySqlConnection con = new MySqlConnection(connectionString))
{
con.Open();
using (MySqlCommand cmd = new MySqlCommand(sql, con))
{
foreach (MySqlParameter parameter in parameters)
{
cmd.Parameters.Add(parameter);
}
MySqlDataAdapter adapter = new MySqlDataAdapter(cmd);
adapter.Fill(dataset);
}
}
return dataset.Tables[0];
}
/// <summary>
/// DataTable批量加入MYSQL数据库
/// </summary>
/// <param name="dataTable"></param>
/// <returns></returns>
public string InsertByDataTable(DataTable dataTable)
{
string result = string.Empty;
if (null == dataTable || dataTable.Rows.Count <= 0)
{
return "添加失败！DataTable暂无数据！";
}
if (string.IsNullOrEmpty(dataTable.TableName))
{
return "添加失败！请先设置DataTable的名称！";
}
// 构建INSERT语句
StringBuilder sb = new StringBuilder();
sb.Append("INSERT INTO " + dataTable.TableName + "(");
for (int i = 0; i < dataTable.Columns.Count; i++)
{
sb.Append(dataTable.Columns[i].ColumnName + ",");
}
sb.Remove(sb.ToString().LastIndexOf(','), 1);
sb.Append(") VALUES ");
for (int i = 0; i < dataTable.Rows.Count; i++)
{
sb.Append("(");
for (int j = 0; j < dataTable.Columns.Count; j++)
{
sb.Append("'" + dataTable.Rows[i][j] + "',");
}
sb.Remove(sb.ToString().LastIndexOf(','), 1);
sb.Append("),");
}
sb.Remove(sb.ToString().LastIndexOf(','), 1);
sb.Append(";");
int res = -1;
using (MySqlConnection con = new MySqlConnection(connectionString))
{
con.Open();
using (MySqlCommand cmd = new MySqlCommand(sb.ToString(), con))
{
try
{
res = cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
res = -1;
// Unknown column 'names' in 'field list'
result = "操作失败！" + ex.Message.Replace("Unknown column", "未知列").Replace("in 'field list'","存在字段集合中！");
}
}
}
if (res > 0)
{
result = "恭喜添加成功!";
}
return result;
}
}