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C#連接MySQL數(shù)據(jù)庫的方法步驟

 更新時(shí)間:2023年01月11日 14:20:49   作者:熊思宇  
最近兩天在解決C#連接MySql數(shù)據(jù)庫的問題,通過不同的從網(wǎng)上學(xué)習(xí),最終找到了解決的辦法,下面這篇文章主要給大家介紹了關(guān)于C#連接MySQL數(shù)據(jù)庫的方法步驟,需要的朋友可以參考下

一、需求

C# 使用 MySQL 數(shù)據(jù)庫的情況還是比較少的,大部分使用 Windows 平臺(tái)一般使用 SQL Server,在兩年前我買過100元一年的學(xué)生服務(wù)器,當(dāng)時(shí)也是買著玩的,裝 MySQL 數(shù)據(jù)庫使用起來就非常卡,也不知道為什么,但 SQL Server 操作起來不但不卡,還非常的流暢,但是 SQL Server 安裝起來比較麻煩,卸載也容易出問題,尤其是盜版系統(tǒng),我在工作中,也出現(xiàn)了幾次 SQL Server 卸載不了的事,我自己電腦用的正版Win10系統(tǒng),從沒出現(xiàn)這種事。MySQL 和 SQL Server 各有自己的優(yōu)點(diǎn),如果非要使用 MySQL,也是可以的,下面就會(huì)介紹 C# 如何去調(diào)用 MySQL。

二、新建 C# 項(xiàng)目

新建一個(gè)控制臺(tái)項(xiàng)目,取名 CSharpConnectMySQL

這里我使用的不使用頂級(jí)語句

項(xiàng)目創(chuàng)建完成后,如下

namespace CSharpConnectMySQL
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello, World!");
        }
    }
}

三、MySQL數(shù)據(jù)庫

MySQL 的安裝,可以在百度搜一下,這里就不演示了

下面不搞復(fù)雜的流程,隨便弄點(diǎn)數(shù)據(jù),就以 shop 數(shù)據(jù)庫 中的 goods_type 來演示好了。

各位可以自己動(dòng)手操作一下,數(shù)據(jù)庫和表不一定和我的一樣,在后面的 sql 語句中,自己改下就好了。 

四、MySqlHelper

在使用之前,先安裝 MySql.Data 插件

接著安裝 System.Data.SqlClient

這樣就安裝完成了,接下來就是代碼了

MySqlHelper.cs

using MySql.Data.MySqlClient;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace CSharpConnectMySQL
{
    public class MySqlHelper
    {
        private static string connstr = "server=127.0.0.1;database=shop;username=root;password=123456;";
 
 
        #region 執(zhí)行查詢語句,返回MySqlDataReader
 
        /// <summary>
        /// 執(zhí)行查詢語句,返回MySqlDataReader
        /// </summary>
        /// <param name="sqlString"></param>
        /// <returns></returns>
        public static MySqlDataReader ExecuteReader(string sqlString)
        {
            MySqlConnection connection = new MySqlConnection(connstr);
            MySqlCommand cmd = new MySqlCommand(sqlString, connection);
            MySqlDataReader myReader = null;
            try
            {
                connection.Open();
                myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                return myReader;
            }
            catch (System.Data.SqlClient.SqlException e)
            {
                connection.Close();
                throw new Exception(e.Message);
            }
            finally
            {
                if (myReader == null)
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
        }
        #endregion
 
        #region 執(zhí)行帶參數(shù)的查詢語句,返回 MySqlDataReader
 
        /// <summary>
        /// 執(zhí)行帶參數(shù)的查詢語句,返回MySqlDataReader
        /// </summary>
        /// <param name="sqlString"></param>
        /// <param name="cmdParms"></param>
        /// <returns></returns>
        public static MySqlDataReader ExecuteReader(string sqlString, params MySqlParameter[] cmdParms)
        {
            MySqlConnection connection = new MySqlConnection(connstr);
            MySqlCommand cmd = new MySqlCommand();
            MySqlDataReader myReader = null;
            try
            {
                PrepareCommand(cmd, connection, null, sqlString, cmdParms);
                myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return myReader;
            }
            catch (System.Data.SqlClient.SqlException e)
            {
                connection.Close();
                throw new Exception(e.Message);
            }
            finally
            {
                if (myReader == null)
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
        }
        #endregion
 
        #region 執(zhí)行sql語句,返回執(zhí)行行數(shù)
 
        /// <summary>
        /// 執(zhí)行sql語句,返回執(zhí)行行數(shù)
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public static int ExecuteSql(string sql)
        {
            using (MySqlConnection conn = new MySqlConnection(connstr))
            {
                using (MySqlCommand cmd = new MySqlCommand(sql, conn))
                {
                    try
                    {
                        conn.Open();
                        int rows = cmd.ExecuteNonQuery();
                        return rows;
                    }
                    catch (MySql.Data.MySqlClient.MySqlException e)
                    {
                        conn.Close();
                        //throw e;
                        Console.WriteLine(e.Message);
                    }
                    finally
                    {
                        cmd.Dispose();
                        conn.Close();
                    }
                }
            }
 
            return -1;
        }
        #endregion
 
        #region 執(zhí)行帶參數(shù)的sql語句,并返回執(zhí)行行數(shù)
 
        /// <summary>
        /// 執(zhí)行帶參數(shù)的sql語句,并返回執(zhí)行行數(shù)
        /// </summary>
        /// <param name="sqlString"></param>
        /// <param name="cmdParms"></param>
        /// <returns></returns>
        public static int ExecuteSql(string sqlString, params MySqlParameter[] cmdParms)
        {
            using (MySqlConnection connection = new MySqlConnection(connstr))
            {
                using (MySqlCommand cmd = new MySqlCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, sqlString, cmdParms);
                        int rows = cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();
                        return rows;
                    }
                    catch (System.Data.SqlClient.SqlException E)
                    {
                        throw new Exception(E.Message);
                    }
                    finally
                    {
                        cmd.Dispose();
                        connection.Close();
                    }
                }
            }
        }
        #endregion
 
        #region 執(zhí)行查詢語句,返回DataSet
 
        /// <summary>
        /// 執(zhí)行查詢語句,返回DataSet
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public static DataSet GetDataSet(string sql)
        {
            using (MySqlConnection conn = new MySqlConnection(connstr))
            {
                DataSet ds = new DataSet();
                try
                {
                    conn.Open();
                    MySqlDataAdapter DataAdapter = new MySqlDataAdapter(sql, conn);
                    DataAdapter.Fill(ds);
                }
                catch (Exception ex)
                {
                    //throw ex;
                    Console.WriteLine(ex.Message);
                }
                finally
                {
                    conn.Close();
                }
                return ds;
            }
        }
        #endregion
 
        #region 執(zhí)行帶參數(shù)的查詢語句,返回DataSet
 
        /// <summary>
        /// 執(zhí)行帶參數(shù)的查詢語句,返回DataSet
        /// </summary>
        /// <param name="sqlString"></param>
        /// <param name="cmdParms"></param>
        /// <returns></returns>
        public static DataSet GetDataSet(string sqlString, params MySqlParameter[] cmdParms)
        {
            using (MySqlConnection connection = new MySqlConnection(connstr))
            {
                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 (System.Data.SqlClient.SqlException ex)
                    {
                        throw new Exception(ex.Message);
                    }
                    finally
                    {
                        cmd.Dispose();
                        connection.Close();
                    }
                    return ds;
                }
            }
        }
        #endregion
 
        #region 執(zhí)行帶參數(shù)的sql語句,并返回 object
 
        /// <summary>
        /// 執(zhí)行帶參數(shù)的sql語句,并返回object
        /// </summary>
        /// <param name="sqlString"></param>
        /// <param name="cmdParms"></param>
        /// <returns></returns>
        public static object GetSingle(string sqlString, params MySqlParameter[] cmdParms)
        {
            using (MySqlConnection connection = new MySqlConnection(connstr))
            {
                using (MySqlCommand cmd = new MySqlCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, sqlString, cmdParms);
                        object obj = cmd.ExecuteScalar();
                        cmd.Parameters.Clear();
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (System.Data.SqlClient.SqlException e)
                    {
                        throw new Exception(e.Message);
                    }
                    finally
                    {
                        cmd.Dispose();
                        connection.Close();
                    }
                }
            }
        }
 
        #endregion
 
        /// <summary>
        /// 執(zhí)行存儲(chǔ)過程,返回?cái)?shù)據(jù)集
        /// </summary>
        /// <param name="storedProcName">存儲(chǔ)過程名</param>
        /// <param name="parameters">存儲(chǔ)過程參數(shù)</param>
        /// <returns>DataSet</returns>
        public static DataSet RunProcedureForDataSet(string storedProcName, IDataParameter[] parameters)
        {
            using (MySqlConnection connection = new MySqlConnection(connstr))
            {
                DataSet dataSet = new DataSet();
                connection.Open();
                MySqlDataAdapter sqlDA = new MySqlDataAdapter();
                sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
                sqlDA.Fill(dataSet);
                connection.Close();
                return dataSet;
            }
        }
 
        /// <summary>
        /// 構(gòu)建 SqlCommand 對(duì)象(用來返回一個(gè)結(jié)果集,而不是一個(gè)整數(shù)值)
        /// </summary>
        /// <param name="connection">數(shù)據(jù)庫連接</param>
        /// <param name="storedProcName">存儲(chǔ)過程名</param>
        /// <param name="parameters">存儲(chǔ)過程參數(shù)</param>
        /// <returns>SqlCommand</returns>
        private static MySqlCommand BuildQueryCommand(MySqlConnection connection, string storedProcName,
            IDataParameter[] parameters)
        {
            MySqlCommand command = new MySqlCommand(storedProcName, connection);
            command.CommandType = CommandType.StoredProcedure;
            foreach (MySqlParameter parameter in parameters)
            {
                command.Parameters.Add(parameter);
            }
            return command;
        }
 
        #region 裝載MySqlCommand對(duì)象
 
        /// <summary>
        /// 裝載MySqlCommand對(duì)象
        /// </summary>
        private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, string cmdText,
            MySqlParameter[] cmdParms)
        {
            if (conn.State != ConnectionState.Open)
            {
                conn.Open();
            }
            cmd.Connection = conn;
            cmd.CommandText = cmdText;
            if (trans != null)
            {
                cmd.Transaction = trans;
            }
            cmd.CommandType = CommandType.Text; //cmdType;
            if (cmdParms != null)
            {
                foreach (MySqlParameter parm in cmdParms)
                {
                    cmd.Parameters.Add(parm);
                }
            }
        }
        #endregion
 
    }
}

connstr 中的配置,根據(jù)個(gè)人的設(shè)置來,也可以寫配置文件中。

MySqlHelper 代碼基本功能都有,代碼不是我寫的,我也是復(fù)制別人的

五、測(cè)試

代碼

using System.Data;
 
namespace CSharpConnectMySQL
{
    internal class Program
    {
        static void Main(string[] args)
        {
            string sql = "SELECT * FROM goods_type";
            DataSet dataSet = MySqlHelper.GetDataSet(sql);
            DataTable dt = dataSet.Tables[0];
            if(dt.Rows.Count > 0)
            {
                //打印所有列名
                string columnName = string.Empty;
                for (int i = 0; i < dt.Columns.Count; i++)
                {
                    columnName += dt.Columns[i].ColumnName + " | ";
                }
                Console.WriteLine(columnName);
                Console.WriteLine("-------------------------");
 
                //打印每一行的數(shù)據(jù)
                foreach (DataRow row in dt.Rows)
                {
                    string columnStr = string.Empty;
                    foreach (DataColumn column in dt.Columns)
                    {
                        columnStr += row[column] + " | ";
                    }
                    Console.WriteLine(columnStr);
                }
            }
 
            Console.ReadKey();
        }
    }
}

運(yùn)行:

這樣就 O拉個(gè)K

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