C#底层库--数据库访问帮助类（MySQL版）
系列文章
C#底层库–记录日志帮助类
本文链接：https://blog.csdn.net/youcheng_ge/article/details/124187709
C#底层库–数据库访问帮助类（MySQL版）
本文链接：https://blog.csdn.net/youcheng_ge/article/details/126886379
C#底层库–获取文件版本和MD5值
本文链接：https://blog.csdn.net/youcheng_ge/article/details/112513871
C#底层库–操作文件帮助类FileHelper（获取目录的所有文件）
本文链接：https://blog.csdn.net/youcheng_ge/article/details/126887161
C#底层库–操作Excel帮助类（读取、导出表格）
本文链接：https://blog.csdn.net/youcheng_ge/article/details/126887445
C#底层库–软件版本管理XML
本文链接：https://blog.csdn.net/youcheng_ge/article/details/110195766
C#RegexHelper正则表达式帮助类
本文链接：https://blog.csdn.net/youcheng_ge/article/details/109745286
文章目录
- 系列文章
- 前言
- 一、底层库介绍
- 二、底层库源码
- 三、调用方法
前言
本文将新增一个专栏–底层库，分享编程过程中常用的方法函数。我们将这些常用的方法函数，进行封装，反复测试，形成通用化类库。
方便研发人员，只需要几行代码就可以使用它，解决一些难点问题。
底层库的封装涉及到：数据库操作、加解密算法、日志记录、网络通信、邮件发送、文件操作、参数保存、Excel导入导出等等，持续关注本专栏吧。大家有任何问题，也可以评论区反馈，私信我。
一、底层库介绍
数据库访问帮助类，包含执行脚本、含参执行脚本、执行存储过程、事务处理。
二、底层库源码
创建类MySQLHelper.cs
using System;
using System.Data;
using MySql.Data.MySqlClient;
using System.Collections.Generic;
namespace QRCodeProduce
{
/// bool
public static bool Exists(string strTableName)
{
string l_strSQL = "select 1 1 from " + strTableName;
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand(l_strSQL, connection))
{
try
{
connection.Open();
object obj = cmd.ExecuteScalar();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
return false;
}
else
{
return true;
}
}
catch (MySqlException e)
{
connection.Close();
throw e;
}
}
}
}
/// DataSet
public static DataSet ShowDataBases(string SQLString)
{
string l_str = $"server={server};uid={uid};pwd={pwd};SslMode=None;";
using (MySqlConnection connection = new MySqlConnection(l_str))
{
DataSet ds = new DataSet();
try
{
connection.Open();
MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection);
command.Fill(ds, "ds");
}
catch (MySqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
#endregion
#region 执行简单SQL语句
/// 影响的记录数
public static int ExecuteSql(string SQLString)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
{
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (MySqlException e)
{
connection.Close();
throw e;
}
}
}
}
/// 影响的记录数
public static int ExecuteSql(string SQLString, string strParamText)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
MySqlCommand cmd = new MySqlCommand(SQLString, connection);
MySqlParameter myParameter = new MySqlParameter("@content", SqlDbType.NText);
myParameter.Value = strParamText;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (MySqlException e)
{
throw e;
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
/// 影响的记录数
public static int ExecuteSql(string SQLString, params MySqlParameter[] cmdParms)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand())
{
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
int rows = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
}
catch (MySqlException e)
{
throw e;
}
}
}
}
/// 影响的记录数
public static int ExecuteSqlByTime(string SQLString, int Times)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
{
try
{
connection.Open();
cmd.CommandTimeout = Times;
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (MySqlException e)
{
connection.Close();
throw e;
}
}
}
}
/// 影响的记录数
public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
MySqlCommand cmd = new MySqlCommand(strSQL, connection);
MySqlParameter myParameter = new MySqlParameter("@fs", SqlDbType.Image);
myParameter.Value = fs;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (MySqlException e)
{
throw e;
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
//执行单条插入语句，并返回id，不需要返回id的用ExceuteNonQuery执行。
/// MySqlDataReader
public static MySqlDataReader ExecuteReader(string strSqlText)
{
MySqlConnection conn = new MySqlConnection(connectionString);
MySqlCommand cmd = new MySqlCommand(strSqlText, conn);
try
{
conn.Open();
MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return myReader;
}
catch (MySqlException e)
{
throw e;
}
}
/// MySqlDataReader
public static MySqlDataReader ExecuteReader(string strSqlText, params MySqlParameter[] cmdParas)
{
MySqlConnection connection = new MySqlConnection(connectionString);
MySqlCommand cmd = new MySqlCommand();
try
{
PrepareCommand(cmd, connection, null, strSqlText, cmdParas);
MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);//不加using，执行conn关闭后自动关闭Reader
cmd.Parameters.Clear();
return myReader;
}
catch (MySqlException e)
{
throw e;
}
}
/// DataSet
public static DataSet Query(string SQLString)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection);
command.Fill(ds, "ds");
}
catch (MySqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
/// DataSet
public static DataSet Query(string SQLString, params MySqlParameter[] cmdParms)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
MySqlCommand cmd = new MySqlCommand();
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
using (MySqlDataAdapter da = new MySqlDataAdapter(cmd))
{
DataSet ds = new DataSet();
try
{
da.Fill(ds, "ds");
cmd.Parameters.Clear();
}
catch (MySqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
}
/// SQLiteParameter的值
public static MySqlParameter MakeMySqlParameter(string name, MySqlDbType type, int size, object value)
{
MySqlParameter parm = new MySqlParameter(name, type, size);
parm.Value = value;
return parm;
}
/// 返回类型为MySqlParameter
public static MySqlParameter MakeMySqlParameter(string name, MySqlDbType type, object value)
{
MySqlParameter parm = new MySqlParameter(name, type);
parm.Value = value;
return parm;
}
#endregion
#region 存储过程的调用
/// 返回DataSet
public static DataSet ExecuteProcDataset(string ProcText)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
MySqlCommand cmd = new MySqlCommand();
PrepareMySqlCommand(cmd, connection, null, CommandType.StoredProcedure, ProcText, null);
using (MySqlDataAdapter da = new MySqlDataAdapter(cmd))
{
DataSet ds = new DataSet();
try
{
da.Fill(ds, "ds");
cmd.Parameters.Clear();
}
catch (MySqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
}
/// 返回DataSet
public static DataSet ExecuteProcDataset(string ProcText, params MySqlParameter[] cmdParms)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
MySqlCommand cmd = new MySqlCommand();
PrepareMySqlCommand(cmd, connection, null, CommandType.StoredProcedure, ProcText, cmdParms);
using (MySqlDataAdapter da = new MySqlDataAdapter(cmd))
{
DataSet ds = new DataSet();
try
{
da.Fill(ds, "ds");
cmd.Parameters.Clear();
}
catch (MySqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
}
#endregion
#endregion
}
}
三、调用方法
MySQLHelper.server = AppConfig.GetValue("db_server");
MySQLHelper.port = AppConfig.GetValue("db_port");
MySQLHelper.BaseName = AppConfig.GetValue("db_base");
MySQLHelper.uid = AppConfig.GetValue("db_uid");
MySQLHelper.pwd = AppConfig.GetValue("db_pwd");
string l_strSql = $"UPDATE t300_muxianzhiliang_result SET 原料编号='{baseDataInput_原料编号.StringValue}'," +
$"原料规格='{baseDataInput_原料规格.StringValue}',原料强度='{baseDataInput_原料强度.StringValue}'," +
$"黄丝厂家='{baseDataInput_黄丝厂家.StringValue}',黄丝代码='{baseDataInput_黄丝代码.StringValue}',doff='{baseDataInput_doff.StringValue}' WHERE id= {m_strkeyVaule}";
MySQLHelper.ExecuteSql(l_strSql);
程序运行效果：
