Unity使用SQLite数据库基本的增删改查_unity sqlite 删除数据

using Mono.Data.Sqlite;
using System;
using System.IO;
using System.Collections.Generic;
using UnityEngine;

public class SQLManager
{ 
    //建立数据库连接                                          
    private static SqliteConnection connection;
    //数据库命令
    private static SqliteCommand command;
    //数据库阅读器
    private static SqliteDataReader reader;

    public SQLManager(string dbPath,string dbName)
    {
        //连接数据库
        OpenConnect(dbPath, dbName);
    }

    /// <summary>
    /// 打开数据库
    /// </summary>
    public void OpenConnect(string dbPath, string dbName)
    {
        try
        {
            if (!Directory.Exists(dbPath))
            {
                Directory.CreateDirectory(dbPath);
            }
            //数据库存放在 Asset/StreamingAssets
            string path = dbPath + dbName + ".db";
            //新建数据库连接
            connection = new SqliteConnection(@"Data Source = " + path);
            //打开数据库
            connection.Open();
            Debug.Log("打开数据库");
        }
        catch (Exception ex)
        {
            Debug.Log(ex.ToString());
        }
    }

    /// <summary>
    /// 关闭数据库
    /// </summary>
    public void CloseDB()
    {
        if (command != null)
        {
            command.Cancel();
        }
        command = null;

        if (reader != null)
        {
            reader.Close();
        }
        reader = null;

        if (connection != null)
        {
            //connection.Close();
        }
        connection = null;

        Debug.Log("关闭数据库");
    }

    /// <summary>
    /// 插入数据
    /// </summary>
    /// <param name="tableName"></param>
    /// <param name="values"></param>
    /// <returns></returns>
    public bool InsertValues(string tableName, List<string> values)
    {
        try
        {
            string sql = "INSERT INTO " + tableName + " values (";
            foreach (var item in values)
            {
                sql += "'" + item + "',";
            }
            sql = sql.TrimEnd(',') + ")";

            ExecuteQuery(sql);
        }
        catch (Exception e)
        {
            Debug.Log(e.ToString());
        }
        return true;
    }

    /// <summary>
    /// 删除数据
    /// </summary>
    /// <param name="tableName"></param>
    /// <param name="conditions">查询条件</param>
    /// <returns></returns>
    public SqliteDataReader DeleteValues(string tableName, List<string> conditions)
    {
        string sql = "delete from " + tableName + " where (";
        try
        {
            for (int i = 0; i < conditions.Count - 1; i += 2)
            {
                sql += conditions[i] + "='" + conditions[i + 1] + "' and ";
            }
            sql = sql.Substring(0, sql.Length - 4) + ");";
        }
        catch (Exception e)
        {
            Debug.Log(e.ToString());
        }
        return ExecuteQuery(sql);
    }

    /// <summary>
    /// 更新数据
    /// </summary>
    /// <param name="tableName"></param>
    /// <param name="values">需要修改的数据</param>
    /// <param name="conditions">修改的条件</param>
    /// <returns></returns>
    public SqliteDataReader UpdataData(string tableName, List<string> values, List<string> conditions)
    {
        string sql = "update " + tableName + " set ";
        for (int i = 0; i < values.Count - 1; i += 2)
        {
            sql += values[i] + "='" + values[i + 1] + "',";
        }
        sql = sql.TrimEnd(',') + " where (";
        for (int i = 0; i < conditions.Count - 1; i += 2)
        {
            sql += conditions[i] + "='" + conditions[i + 1] + "' and ";
        }
        sql = sql.Substring(0, sql.Length - 4) + ");";
        Debug.Log("更新成功");
        return ExecuteQuery(sql);
    }

    /// <summary>
    /// 查询数据
    /// </summary>
    /// <param name="tableName">表名</param>
    /// <returns></returns>
    public List<string> GetDataBySqlQuery(string tableName)
    {
        List<string> list = new List<string>();
        try
        {
            string queryString = "SELECT * FROM " + tableName;
            reader = ExecuteQuery(queryString);
            while (reader.Read())
            {
                for (int i = 0; i < reader.FieldCount; i++)
                {
                    object obj = reader.GetValue(i);
                    list.Add(obj.ToString());
                }
            }
        }
        catch (Exception e)
        {
            Debug.Log(e.ToString());
        }
        return list;
    }

    /// <summary>
    /// 执行SQL命令
    /// </summary>
    /// <param name="queryString">SQL命令字符串</param>
    /// <returns></returns>
    private SqliteDataReader ExecuteQuery(string queryString)
    {
        command = connection.CreateCommand();
        command.CommandText = queryString;
        reader = command.ExecuteReader();
        return reader;
    }

    /// <summary>
    /// 删除表
    /// </summary>
    /// <param name="tableName"></param>
    /// <returns></returns>
    public SqliteDataReader DeleteTable(string tableName)
    {
        string sql = "DROP TABLE " + tableName;
        return ExecuteQuery(sql);
    }
}
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