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一文带你了解C#操作MySql的方法

C#操作MySql方法C#操作MySqlC#MySql 2023-03-20 11:03:44 786人浏览 八月长安
摘要

目录代码介绍代码实现创建数据库创建数据表查询数据事务代码示例代码介绍 功能包含： 创建数据库创建数据表批量添加数据Mysql事务执行清表分页、模糊查询 代码实现 创建数据库 publ

代码介绍

功能包含：

  • 创建数据库
  • 创建数据表
  • 批量添加数据
  • Mysql事务执行
  • 清表
  • 分页、模糊查询

代码实现

创建数据库

public void CreateDatabase(string sqlStr)
{
    string str = $"Server=localhost;User=root;PassWord=123456;CharSet=UTF8;";
    using (mysqlConnection mySqlConnection = new MySqlConnection(mySqlConnection))
    {
        mySqlConnection.Open();
        try 
        {
            MySqlCommand cmd = new MySqlCommand(sqlStr, mySqlConnection);
            cmd.ExecuteNonQuery();
        } catch(Exception e) 
        {
            Debug.Log(e.Message.ToString());
        }
        finally
        {
            mySqlConnection.Close();
        }
    }
}

创建数据表

private static void CteateDataTable(string sqlStr)
{
    using (MySqlConnection mySqlConnection = new MySqlConnection(mySqlConnectStr))
    {
        mySqlConnection.Open();
        MySqlCommand cmd = new MySqlCommand(sqlStr, mySqlConnection);
        try
        {
            cmd.ExecuteNonQuery();
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }
        finally
        {
            mySqlConnection.Close();
        }
    }
}

查询数据

private static DataTable SelectTable(string sqlStr)
{
    DataTable dt = new DataTable();
    using (MySqlConnection mySqlConnection = new MySqlConnection(mySqlConnectStr))
    {
        mySqlConnection.Open();
        try
        {
            MySqlDataAdapter da = new MySqlDataAdapter(sqlStr, mySqlConnection);
            da.Fill(dt);
            return dt;
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }
        finally
        {
            mySqlConnection.Close();
        }
    }
}

事务

private static bool ExecuteSqlTransaction(string sqlStr)
{
    using (MySqlConnection mySqlConnection = new MySqlConnection(mySqlConnectStr))
    {
        mySqlConnection.Open();
        MySqlCommand cmd = mySqlConnection.CreateCommand();
        cmd.Connection = mySqlConnection;
        MySqlTransaction sqlTransaction = mySqlConnection.BeginTransaction();
        try
        {
            cmd.CommandText = sqlStr;
            cmd.ExecuteNonQuery();
            sqlTransaction.Commit();
            sqlTransaction = mySqlConnection.BeginTransaction();
            return true;
        }
        catch (Exception ex)
        {
            sqlTransaction.Rollback();
            return false;
        }
        finally
        {
            mySqlConnection.Close();
        }
    };
}

代码示例

using MySql.Data.MySqlClient;
using Newtonsoft.JSON;
using NPinyin;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.IO;
using System.Text;

namespace ConsoleApp1
{
    internal class Program
    {
        private static string mySqlConnectStr = ConfigurationManager.AppSettings["connectionStr"];

        static void Main(string[] args)
        {
            CreateDatabase("CREATE DATABASE DataBaseName;");

            CreateTable();

            SQLCMD();

            DeleteTableDataAll();

            var drugData = SelectTable(@"SELECT * FROM `t_drugs` WHERE t_drugs.drug_name_py LIKE ""%PT%"" LIMIT 1,10;");

            List<Drug> drugs = new List<Drug>();
            foreach (DataRow item in drugData.Rows)
            {
                drugs.Add(new Drug
                {
                    hospital_no = item["hospital_no"].ToString(),
                    hospital_name = item["hospital_name"].ToString(),
                    drug_id = item["drug_id"].ToString(),
                    drug_name = item["drug_name"].ToString(),
                    drug_type = item["drug_type"].ToString(),
                    drug_short = item["drug_short"].ToString(),
                    sizes = item["sizes"].ToString(),
                    unit = item["unit"].ToString(),
                    price = item["price"].ToString(),
                    money_type = item["money_type"].ToString(),
                    producer = item["producer"].ToString(),
                    dose = item["dose"].ToString(),
                    usage = item["usage"].ToString(),
                    summary = item["summary"].ToString(),
                    ext = item["ext"].ToString(),
                });
            }

            DataTable projectData = SelectTable(@"SELECT * FROM `t_project` WHERE t_project.item_name_py LIKE ""%PT%"" LIMIT 1,10;");

            List<Project> project = new List<Project>();
            foreach (DataRow item in projectData.Rows)
            {
                project.Add(new Project
                {
                    hospital_no = item["hospital_no"].ToString(),
                    hospital_name= item["hospital_name"].ToString(),
                    item_id = item["item_id"].ToString(),
                    item_name = item["item_name"].ToString(),
                    item_type = item["item_type"].ToString(),
                    item_short = item["item_short"].ToString(),
                    sizes = item["sizes"].ToString(),
                    unit = item["unit"].ToString(),
                    price = item["price"].ToString(),
                    money_type = item["money_type"].ToString(),
                    ext = item["ext"].ToString(),
                });
            }

            Console.ReadKey();
        }

        public void CreateDatabase(string sqlStr)
        {
            string str = $"Server=localhost;User=root;Password=123456;CharSet=UTF8;";
            using (MySqlConnection mySqlConnection = new MySqlConnection(mySqlConnection))
            {
                mySqlConnection.Open();
                try 
                {
                    MySqlCommand cmd = new MySqlCommand(sqlStr, mySqlConnection);
                    cmd.ExecuteNonQuery();
                } catch(Exception e) 
                {
                    Debug.Log(e.Message.ToString());
                }
                finally
                {
                    mySqlConnection.Close();
                }
            }
	    } 

        private static DataTable SelectTable(string sqlStr)
        {
            DataTable dt = new DataTable();
            using (MySqlConnection mySqlConnection = new MySqlConnection(mySqlConnectStr))
            {
                mySqlConnection.Open();
                try
                {
                    MySqlDataAdapter da = new MySqlDataAdapter(sqlStr, mySqlConnection);
                    da.Fill(dt);
                    return dt;
                }
                catch (Exception ex)
                {
                    throw new Exception(ex.Message);
                }
                finally
                {
                    mySqlConnection.Close();
                }
            }
        }

        /// <summary>
        /// 执行 插入药品、项目数据
        /// </summary>
        private static void SQLCMD()
        {
            #region 药品

            var drugjsonPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, $"drug.json");
            var drugJsonStr = File.ReadAllText(drugjsonPath);
            Rootobject<List<Drug>> drugs = JsonConvert.DeserializeObject<Rootobject<List<Drug>>>(drugJsonStr);
            string drugSql = @"INSERT INTO T_drugs (drug_id,drug_name,drug_type,sizes,unit,price,money_type,producer) VALUE ";
            foreach (var drug in drugs.data)
            {
                drugSql += $"(\"{drug.drug_id}\",\"{drug.drug_name}\",\"{drug.drug_type}\",\"{drug.sizes}\",\"{drug.unit}\",\"{drug.price}\",\"{drug.money_type}\",\"{drug.producer}\"),";
            }
            drugSql = $"{drugSql.Remove(drugSql.Length - 1, 1)};";
            if (ExecuteSqlTransaction(drugSql))
            {
                Console.WriteLine("执行成功！");
            }
            else
            {
                Console.WriteLine("执行失败！");
            }

            #endregion

            #region 项目

            var projectjsonPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, $"project.json");
            var projectJsonStr = File.ReadAllText(projectjsonPath);
            Rootobject<List<Project>> projects = JsonConvert.DeserializeObject<Rootobject<List<Project>>>(projectJsonStr);
            string projectSql = @"INSERT INTO T_project (item_id,item_name,unit,price) VALUE ";
            foreach (var project in projects.data)
            {
                projectSql += $"(\"{project.item_id}\",\"{project.item_name}\",\"{project.unit}\",\"{project.price}\"),";
            }
            projectSql = $"{projectSql.Remove(projectSql.Length - 1, 1)};";
            if (ExecuteSqlTransaction(projectSql))
            {
                Console.WriteLine("执行成功！");
            }
            else
            {
                Console.WriteLine("执行失败！");
            }
            #endregion
        }

        /// <summary>
        /// 创建 药品、项目表
        /// </summary>
        private static void CreateTable()
        {
            string t_drugSql = @"USE xzd;
                                CREATE TABLE IF NOT EXISTS T_drugs
                                (
	                                `hospital_no` VARCHAR(20),
	                                `hospital_name` VARCHAR(50),
	                                `drug_id` VARCHAR(50),
	                                `drug_name` VARCHAR(50),
	                                `drug_name_py` VARCHAR(50),
	                                `drug_type` VARCHAR(10),
	                                `drug_short` VARCHAR(10),
	                                `sizes` VARCHAR(10),
	                                `unit` VARCHAR(10),
	                                `price` VARCHAR(10),
	                                `money_type` VARCHAR(50),
	                                `producer` VARCHAR(100),
	                                `dose` VARCHAR(10),
	                                `usage` VARCHAR(10),
	                                `summary` VARCHAR(50),
	                                `ext` VARCHAR(50)
                                )ENGINE=INNODB DEFAULT CHARSET=utf8;";

            string t_project = @"USE xzd;
                                CREATE TABLE IF NOT EXISTS T_project
                                (
                                 `hospital_no` VARCHAR(20),
                                 `hospital_name` VARCHAR(50),
                                 `item_id` VARCHAR(50),
                                 `item_name` VARCHAR(50),
                                 `item_name_py` VARCHAR(50),
                                 `item_type` VARCHAR(10),
                                 `item_short` VARCHAR(10),
                                 `sizes` VARCHAR(10),
                                 `unit` VARCHAR(30),
                                 `price` VARCHAR(10),
                                 `money_type` VARCHAR(50),
                                 `ext` VARCHAR(50)
                                )ENGINE=INNODB DEFAULT CHARSET=utf8;";


            CteateDataTable(t_drugSql);
            CteateDataTable(t_project);
        }

        /// <summary>
        /// 执行创建表sql
        /// </summary>
        /// <param name="sqlStr"></param>
        private static void CteateDataTable(string sqlStr)
        {
            using (MySqlConnection mySqlConnection = new MySqlConnection(mySqlConnectStr))
            {
                mySqlConnection.Open();
                MySqlCommand cmd = new MySqlCommand(sqlStr, mySqlConnection);
                try
                {
                    cmd.ExecuteNonQuery();
                }
                catch (Exception ex)
                {
                    throw new Exception(ex.Message);
                }
                finally
                {
                    mySqlConnection.Close();
                }
            }
        }

        /// <summary>
        /// mysql事务
        /// </summary>
        /// <param name="sqlStr"></param>
        /// <exception cref="Exception"></exception>
        private static bool ExecuteSqlTransaction(string sqlStr)
        {
            using (MySqlConnection mySqlConnection = new MySqlConnection(mySqlConnectStr))
            {
                mySqlConnection.Open();
                MySqlCommand cmd = mySqlConnection.CreateCommand();
                cmd.Connection = mySqlConnection;

                MySqlTransaction sqlTransaction = mySqlConnection.BeginTransaction();
                try
                {
                    cmd.CommandText = sqlStr;
                    cmd.ExecuteNonQuery();
                    sqlTransaction.Commit();
                    sqlTransaction = mySqlConnection.BeginTransaction();
                    return true;
                }
                catch (Exception ex)
                {
                    sqlTransaction.Rollback();
                    return false;
                }
                finally
                {
                    mySqlConnection.Close();
                }
            };

        }

        /// <summary>
        /// 删除表所有数据
        /// </summary>
        /// <returns></returns>
        private static bool DeleteTableDataAll()
        {
            string sqlStr = @"DELETE FROM T_drugs; DELETE FROM T_project;";
            using (MySqlConnection mySqlConnection = new MySqlConnection(mySqlConnectStr))
            {
                mySqlConnection.Open();
                MySqlCommand cmd = new MySqlCommand(sqlStr, mySqlConnection);
                try
                {
                    cmd.ExecuteNonQuery();                   
                    return true;
                }
                catch (Exception ex)
                {
                    return false;
                    throw new Exception(ex.Message);
                }
                finally
                {
                    mySqlConnection.Close();
                }
            }
        }
    }

    #region 实体

    /// <summary>
    /// 包装类
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class Rootobject<T>
    {
        public string code { get; set; }
        public T data { get; set; }
    }

    /// <summary>
    /// 药品
    /// </summary>
    public class Drug
    {
        public string hospital_no { get; set; }
        public string hospital_name { get; set; }
        public string drug_id { get; set; }
        public string drug_name { get; set; }
        public string drug_type { get; set; }
        public string drug_short { get; set; }
        public string sizes { get; set; }
        public string unit { get; set; }
        public string price { get; set; }
        public string money_type { get; set; }
        public string producer { get; set; }
        public string dose { get; set; }
        public string usage { get; set; }
        public string summary { get; set; }
        public string ext { get; set; }
    }

    /// <summary>
    /// 项目
    /// </summary>
    public class Project
    {
        public string hospital_no { get; set; }
        public string hospital_name { get; set; }
        public string item_id { get; set; }
        public string item_name { get; set; }
        public string item_type { get; set; }
        public string item_short { get; set; }
        public string sizes { get; set; }
        public string unit { get; set; }
        public string price { get; set; }
        public string money_type { get; set; }
        public string ext { get; set; }
    }

    #endregion
}

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