转载至https://blog.csdn.net/qq_37501983/article/details/79194631（非常棒）
一.准备工作
(1)Unity使用MySQL需要导入以下两个dll文件，注意文件的.net版本。
（2）进行交互前了解数据库基本的增删改查语句
->增：insert into 表名 (数据1，数据2，数据3，......) values ('值1'，'值2'，'值3'，......)
->删：delete from 表名 where 限制条件
->改：update 表名 set 目标值 where 限制条件
->查：select 数据1 from 表名 where 限制条件
->建表：create table 表名 （数据1 类型，数据2 类型，数据3 类型，......）
->删表：drop table 表名
（3）新建脚本注意引入命名空间
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二.脚本编写
public class SqlAccess {
public static MySqlConnection mySqlConnection;
//数据库名称
public static string database = "daybreak";
//数据库IP
private static string host = "localhost";
//用户名
private static string username = "root";
//用户密码
private static string password = "root";
public static string sql = string.Format("database={0};server={1};user={2};password={3};port={4}",
database, host, username, password, "3306");
public static MySqlConnection con;
private MySqlCommand com;
#region BaseOperation/// <summary>
/// 构造方法开启数据库
/// </summary>
public SqlAccess()
{
con = new MySqlConnection(sql);
OpenMySQL(con);
}
/// <summary>
/// 启动数据库
/// </summary>
/// <param name="con"></param>
public void OpenMySQL(MySqlConnection con)
{
con.Open();
Debug.Log("数据库已连接");
}
/// <summary>
/// 创建表
/// </summary>
/// <param name="sql"></param>
/// <param name="con"></param>
public void CreateTable(string sql,MySqlConnection con)
{
MySqlCommand com = new MySqlCommand(sql, con);
int res = com.ExecuteNonQuery();
}
/// <summary>
/// 插入数据
/// </summary>
/// <param name="sql"></param>
/// <param name="con"></param>
public void InsertInfo(string sql,MySqlConnection con)
{
MySqlCommand com = new MySqlCommand(sql, con);
int res = com.ExecuteNonQuery();
}
/// <summary>
/// 删除数据
/// </summary>
/// <param name="sql"></param>
/// <param name="con"></param>
public void DeleteInfo(string sql,MySqlConnection con)
{
MySqlCommand com = new MySqlCommand(sql, con);
int res = com.ExecuteNonQuery();
}
/// <summary>
/// 修改数据
/// </summary>
/// <param name="sql"></param>
/// <param name="con"></param>
public void UpdateInfo(string sql,MySqlConnection con)
{
MySqlCommand com = new MySqlCommand(sql, con);
int res = com.ExecuteNonQuery();
}
/// <summary>
/// 查询数据
/// </summary>
/// <param name="sql"></param>
/// <param name="con"></param>
public Dictionary<int,List<string>> QueryInfo(string sql,MySqlConnection con)
{
int indexDic = 0;
int indexList = 0;
Dictionary<int, List<string>> dic = new Dictionary<int, List<string>>();
MySqlCommand com = new MySqlCommand(sql, con);
MySqlDataReader reader = com.ExecuteReader();
while (true)
{
if (reader.Read())
{
List<string> list = new List<string>();
for (int i = 0; i < reader.FieldCount; i++)
{
list.Add(reader[indexList].ToString());
indexList++;
}
dic.Add(indexDic, list);
indexDic++;
indexList = 0;
}
else
{
break;
}
}
return dic;
}
/// <summary>
/// 关闭数据库
/// </summary>
public void CloseMySQL()
{
(new MySqlConnection(sql)).Close();
Debug.Log("关闭数据库");
}
#endregion
}
（2）数据库功能实现
public class StudentSql : MonoBehaviour
{
/// <summary>
/// 工具类对象
/// </summary>
private SqlAccess sqlAce;
MySqlConnection con;
void Start()
{
//CreateStudentTable();
//InsertInfomation();
//QueryInfomation1();
//QueryInfomation2();
//UpdateInfomation();
//DeleteInfomation();
DeleteTable();
}
//1、建立一个“学生”表Student，它由学号Sid、姓名Sname、性别Ssex、年龄Sage、所在专业Sdept五个属性组成,类型自己定义
/// <summary>
/// 创建学生表
/// </summary>
public void CreateStudentTable()
{
sqlAce = new SqlAccess();
con = SqlAccess.con;
string sql = ("create table Student(Sid varchar(12),Sname varchar(8),Sage int,Sdept varchar(8))");
sqlAce.CreateTable(sql, con);
sqlAce.CloseMySQL();
}
//2、添加自己所在组的所有成员到表中。
/// <summary>
/// 学生表插值
/// </summary>
public void InsertInfomation()
{
sqlAce = new SqlAccess();
con = SqlAccess.con;
string sql1 = ("insert into Student(Sid,Sname,Sage,Sdept) values('1001','学生A','20','土木工程')");
string sql2 = ("insert into Student(Sid,Sname,Sage,Sdept) values('1002','学生B','15','计算机与科学')");
string sql3 = ("insert into Student(Sid,Sname,Sage,Sdept) values('1003','学生C','16','电子商务')");
string sql4 = ("insert into Student(Sid,Sname,Sage,Sdept) values('1004','学生D','25','电子竞技')");
string sql5 = ("insert into Student(Sid,Sname,Sage,Sdept) values('1005','学生E','23','网络工程')");
string[] str = new string[5] { sql1, sql2, sql3, sql4, sql5 };
for (int i = 0; i < str.Length; i++)
{
sqlAce.InsertInfo(str[i], con);
}
sqlAce.CloseMySQL();
}
//3、查询年龄在18至24岁之间的学生的姓名和专业
/// <summary>
/// 查询学生信息01
/// </summary>
public void QueryInfomation1()
{
sqlAce = new SqlAccess();
con = SqlAccess.con;
string sql = ("select Sname,Sdept from Student where Sage<'24' and Sage>'18' ");
Dictionary<int, List<string>> dic = sqlAce.QueryInfo(sql, con);
for (int i = 0; i < dic.Count; i++)
{
Debug.Log(string.Format("学生姓名：{0} 学生专业：{1}", dic[i][0], dic[i][1]));
}
sqlAce.CloseMySQL();
}
//4、查询所有学生的学号与姓名
/// <summary>
/// 查询学生信息02
/// </summary>
public void QueryInfomation2()
{
sqlAce = new SqlAccess();
con = SqlAccess.con;
string sql = ("select Sid,Sname from Student");
Dictionary<int, List<string>> dic = sqlAce.QueryInfo(sql, con);
for (int i = 0; i < dic.Count; i++)
{
Debug.Log(string.Format("学生学号：{0} 学生姓名：{1}", dic[i][0], dic[i][1]));
}
sqlAce.CloseMySQL();
}
//5、将自己的年龄改为18岁
/// <summary>
/// 更新学生信息
/// </summary>
public void UpdateInfomation()
{
sqlAce = new SqlAccess();
con = SqlAccess.con;
string sql = ("update Student set Sage='18' where Sname='学生A'");
sqlAce.UpdateInfo(sql, con);
sqlAce.CloseMySQL();
}
//6、删除学号为单数的学生记录
/// <summary>
/// 删除表信息
/// </summary>
public void DeleteInfomation()
{
sqlAce = new SqlAccess();
con = SqlAccess.con;
string sql2 = ("select Sid from Student");
Dictionary<int, List<string>> dic = sqlAce.QueryInfo(sql2, con);
sqlAce.CloseMySQL();
sqlAce = new SqlAccess();
con = SqlAccess.con;
for (int i = 0; i < dic.Count; i++)
{
if (Convert.ToInt32(dic[i][0]) % 2 == 1)
{
string sql1 = string.Format("delete from Student where Sid='{0}'", dic[i][0]);
sqlAce.DeleteInfo(sql1, con);
}
}
sqlAce.CloseMySQL();
}
/// <summary>
/// 删除表
/// </summary>
public void DeleteTable()
{
sqlAce = new SqlAccess();
con = SqlAccess.con;
string sql = ("drop table Student");
sqlAce.DeleteInfo(sql, con);
}
}