Unity3D 使用SQLite

　　使用Unity操作SQLite，需要用到三个库文件，分别是Mono.Data.Sqlite.dll和System.Data.dll和Sqlite3.dll，前两个库文件可以在unity中找到，具体步骤：先找到unity安装位置，具体路径如下

（许多人都推荐去2.0目录中找，我用的是4.5，因为2.0会报错），Sqlite3.dll可以去官网下载

配置好环境就可以对数据库进行操作了

这是一些常用操作

using UnityEngine;
using Mono.Data.Sqlite;
using System;

///<summary>
///数据库辅助类
///</summary>
public class SQLiteHelp
{
    private SqliteConnection dbConnection;
    private SqliteCommand dbCommand;
    private SqliteDataReader dbReader;

    public SQLiteHelp(string conStr)
    {
        OpenSQLite(conStr);
    }

    //打开数据库
    public void OpenSQLite(string conStr)
    {
        try
        {      
            dbConnection = new SqliteConnection(conStr);
            dbConnection.Open();
            Debug.Log("Connect successful!");
        }
        catch (Exception ex)
        {
            Debug.Log(ex.Message);
        }
    }

    //创建表
    public SqliteDataReader CreateTable(string tabName, string[] col, string[] colType)
    {
        if (col.Length != colType.Length)
        {
            throw new SqliteException("columns.Length != colType.Length");
        }

        string query = "CREATE TABLE " + tabName + " (" + col[0] + " " + colType[0];

        for (int i = 1; i < col.Length; ++i)
        {
            query += ", " + col[i] + " " + colType[i];
        }

        query += ")";

        return ExecuteQuery(query);
    }

    //连接数据库
    public void CloseSqlConnection()

    {
        if (dbCommand != null)
        {
            dbCommand.Dispose();
        }
        dbCommand = null;

        if (dbReader != null)
        {
            dbReader.Dispose();
        }
        dbReader = null;

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

        Debug.Log("Disconnected from db.");
    }

    //执行sqlQuery操作 
    public SqliteDataReader ExecuteQuery(string sqlQuery)
    {
        dbCommand = dbConnection.CreateCommand();
        dbCommand.CommandText = sqlQuery;
        dbReader = dbCommand.ExecuteReader();

        return dbReader;
    }

    //插入数据
    public SqliteDataReader InsertInto(string tableName, string[] values)
    {
        string query = "INSERT INTO " + tableName + " VALUES (" + values[0];

        for (int i = 1; i < values.Length; ++i)
        {
            query += ", " + values[i];
        }

        query += ")";

        return ExecuteQuery(query);
    }

    //查找表中所有数据
    public SqliteDataReader ReadFullTable(string tableName)
    {
        string query = "SELECT * FROM " + tableName;

        return ExecuteQuery(query);
    }

    //查找表中指定数据
    public SqliteDataReader ReadSpecificData(string tableName, string selectkey, string selectvalue)
    {
        string query = "SELECT * FROM " + tableName + " where " + selectkey + " = " + selectvalue + " ";

        return ExecuteQuery(query);
    }


    //更新数据  SQL语法：UPDATE table_name SET column1 = value1, column2 = value2....columnN = valueN[WHERE  CONDITION];
    public SqliteDataReader UpdateInto(string tableName, string[] cols, string[] colsvalues, string selectkey, string selectvalue)
    {
        string query = "UPDATE " + tableName + " SET " + cols[0] + " = " + colsvalues[0];

        for (int i = 1; i < colsvalues.Length; ++i)
        {
            query += ", " + cols[i] + " =" + colsvalues[i];
        }

        query += " WHERE " + selectkey + " = " + selectvalue + " ";

        return ExecuteQuery(query);
    }

    //删除表中的内容  DELETE FROM table_name  WHERE  {CONDITION or CONDITION}(删除所有符合条件的内容）
    public SqliteDataReader Delete(string tableName, string[] cols, string[] colsvalues)
    {
        string query = "DELETE FROM " + tableName + " WHERE " + cols[0] + " = " + colsvalues[0];

        for (int i = 1; i < colsvalues.Length; ++i)
        {
            query += " or " + cols[i] + " = " + colsvalues[i];
        }
        
        return ExecuteQuery(query);
    }

    //插入指定的数据
    public SqliteDataReader InsertIntoSpecific(string tableName, string[] cols, string[] values)
    {
        if (cols.Length != values.Length)
        {
            throw new SqliteException("columns.Length != values.Length");
        }

        string query = "INSERT INTO " + tableName + "(" + cols[0];

        for (int i = 1; i < cols.Length; ++i)
        {
            query += ", " + cols[i];
        }

        query += ") VALUES (" + values[0];

        for (int i = 1; i < values.Length; ++i)
        {
            query += ", " + values[i];
        }

        query += ")";

        return ExecuteQuery(query);
    }

    //判断在指定列名中是否存在输入的值
    public bool ExitItem(string tableName,string itemName,string itemValue)
    {
        bool flag = false;

        dbReader = ReadFullTable(tableName);

        while (dbReader.Read())
        {
            for(int i=0; i<dbReader.FieldCount; i++)
            {
                if(dbReader.GetName(i) == itemName)
                {
                    if(dbReader.GetValue(i).ToString() == itemValue)
                    {
                        flag = true;
                        break;
                    }
                }
            }
        }

        return flag;
    }
}

 如果不清楚SQLite基本操作，可以访问：https://www.yiibai.com/sqlite/date-and-time.html