C#向MySQL增删查改未完...

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.Data.SqlClient;
using MySql.Data.MySqlClient;
public class MysqlManager
{
    string ip = "127.0.0.1";//本机ip地址
    string username = "root";
    string password = "123456";
    string dbName = "mrwang";

    MySqlCommand command;
    MySqlConnection connect;
    public MysqlManager()
    {
        connect = new MySqlConnection();
        connect.ConnectionString = "server=" + ip + ";user id=" + username + ";password=" + password + ";database=" + dbName;
        connect.Open();
        Console.WriteLine("打开数据库成功");

        command = connect.CreateCommand();

        //Dictionary<string, string> skills = new Dictionary<string, string>();
        //skills.Add("id ", "int primary key");
        //skills.Add("name ", "varchar(10)");
        //skills.Add("attack ", "int");
        //skills.Add("ranges ", "float");
        ////根据子弹。创建表
        //CreateTable(" Skill", skills);

        //InsertInto("skill");
        //UpdateSet("skill");
        //DeleteFrom("skill");
        //SelectFrom("skill");

        //CreateTable<UserData>();

        //UserData user = new UserData();
        //user.id = 1;
        //user.username = "[email protected]";
        //user.nickname = "FollowYourHeart";
        //user.password = "123456";

        //InsertInto(user);

        //List<UserData> users = SelectFrom<UserData>();
        UserData user = new UserData();
        UpdateSet(user,user.id);
    }

    //创建表(带泛型)
    void CreateTable<T>() where T : class//where后面指泛型约束
    {
        //反射
        Type type = typeof(T);
        string tableName = type.Name;//通过反射拿到类名
        System.Reflection.FieldInfo[] fileds = type.GetFields();//通过反射获取type类的字段

        //FieldInfo.Name:字段名
        //FieldInfo.FieldType:字段类型
        string sql = "create table " + tableName + " (";
        foreach (var item in fileds)
        {
            if (item.Name == "id")
                sql += item.Name + " " + CS2DB(item.FieldType) + " primary key auto_increment,";//主键 自动递增
            else
                sql += item.Name + " " + CS2DB(item.FieldType) + ",";
        }
        sql = sql.TrimEnd(',') + ")";//删除最后的逗号
        ExcuteSql(sql);
    }

    string CS2DB(Type type)
    {
        string dbType = "";
        if (type.Name == "String")
        {
            dbType = "Text";
        }
        else if (type.Name == "Int32")
        {
            dbType = "Int";
        }
        else if (type.Name == "Float")
        {
            dbType = "Float";
        }
        return dbType;
    }

    //创建表
    void CreateTable(string tabelName, Dictionary<string, string> infos)
    {
        string sql = "create table " + tabelName + "(";
        foreach (var item in infos)
        {
            sql += item.Key + " " + item.Value + ",";
        }
        sql = sql.TrimEnd(',') + ");";
        ExcuteSql(sql);
    }

    //增
    void InsertInto(string tableName)
    {
        string sql = "insert into " + tableName + " " + "values(1,'大灾变',10,10)";
        ExcuteSql(sql);
    }

    //增加(带泛型)
    void InsertInto<T>(T t) where T : class
    {
        //反射
        Type type = typeof(T);//T可以拿到一个类的一个值，也可以设置值
        string tableName = type.Name;
        System.Reflection.FieldInfo[] fileds = type.GetFields();//通过反射获取字段

        string sql = "insert into " + tableName + " values(";
        foreach (System.Reflection.FieldInfo item in fileds)//FieldInfo:一个类的一个字段
        {
            string value = item.GetValue(t).ToString();//通过反射得到t对象中某个字段的值
            sql += "'" + value + "' ,";
        }
        sql = sql.TrimEnd(',') + ")";//删除最后的逗号
        ExcuteSql(sql);
    }

    //删
    void DeleteFrom(string tableName)
    {
        string sql = "delete from " + tableName + " " + "where id=1 ";
        ExcuteSql(sql);
    }

    //删(带泛型)
    void DeleteFrom<T>(int id)
    {
        string tableName = typeof(T).Name;
        string sql = "delete from " + tableName + " " + "where id=1 " + id;
        ExcuteSql(sql);
    }

    //改
    void UpdateSet(string tableName)
    {
        string sql = "update " + tableName + " " + "set name = '炎爆术' where id=1";
        ExcuteSql(sql);
    }

    //改(带泛型)
    void UpdateSet<T>(T t, int id)
    {
        Type type = typeof(T);//T可以拿到一个类的一个值，也可以设置值
        string tableName = typeof(T).Name;
        System.Reflection.FieldInfo[] fileds = type.GetFields();//通过反射获取字段
        string sql = "update " + tableName + " " + "set name = '炎爆术' where id=1" + id;
        foreach (System.Reflection.FieldInfo item in fileds)
        {
            string value = item.GetValue(t).ToString();//通过反射得到t对象中某个字段的值
            sql += "update" + value + " " + "set name = '火球术' where id=1" + id;
        }
        ExcuteSql(sql);
    }


    //查
    void SelectFrom(string tableName)
    {
        string sql = "select * from " + tableName;
        command.CommandText = sql;
        MySqlDataReader reader = command.ExecuteReader();//以阅读器来查询

        while (reader.Read())
        {
            int count = reader.FieldCount;
            for (int i = 0; i < count; i++)
            {
                string key = reader.GetName(i);//列名
                object value = reader.GetValue(i);//列值

                Console.WriteLine(key + ":" + value);
            }
        }
    }

    //查询(带泛型)
    List<T> SelectFrom<T>() where T : class, new()
    {
        Type type = typeof(T);
        string tableName = type.Name;//得到泛型的名字
        string sql = "select * from " + tableName;

        command.CommandText = sql;
        MySqlDataReader reader = command.ExecuteReader();//以阅读器来查询

        List<T> array = new List<T>();
        while (reader.Read())
        {
            T t = new T();
            int count = reader.FieldCount;
            for (int i = 0; i < count; i++)
            {
                string key = reader.GetName(i);//列名
                object value = reader.GetValue(i);//列值

                type.GetField(key).SetValue(t, value);//把t中的key字段,填充数据value
                Console.WriteLine(key + ":" + value);
            }
            array.Add(t);
        }
        return array;
    }


    void ExcuteSql(string sql)
    {
        Console.WriteLine("sql->" + sql);
        command.CommandText = sql;
        command.ExecuteNonQuery();
    }
}