SQLite操作总结

Posted 2020-08-15 人生为卒

引用：

System.Data.SQLite.dll

System.Data.SqlClient.dll 

 

注意：：：：SQLite.Interop.076.dll 这样的dll必须放在wince设备上（“计算机\BT-W_Series\\\Windows“或者“程序根目录“）

using System;
using System.Data.SQLite;

namespace Framework.DataAccess
{
    public class SQLiteMager
    {
        //数据库连接
        SQLiteConnection m_dbConnection;

        static void Main(string[] args)
        {
            SQLiteMager p = new SQLiteMager();
        }

        public SQLiteMager()
        {
            createNewDatabase();
            connectToDatabase();
            createTable();
            fillTable();
            printHighscores();
        }

        //创建一个空的数据库
        public void createNewDatabase()
        {
            SQLiteConnection.CreateFile("MyDatabase.sqlite");
        }

        //创建一个连接到指定数据库
        public void connectToDatabase()
        {
            m_dbConnection = new SQLiteConnection("Data Source=MyDatabase.sqlite;Version=3;");
       
            m_dbConnection.Open();
        }

        //在指定数据库中创建一个table
        public void createTable()
        {
            string sql = "create table highscores (name varchar(20), score int)";
            SQLiteCommand command = new SQLiteCommand(sql, m_dbConnection);
            command.ExecuteNonQuery();
        }

        //插入一些数据
        public void fillTable()
        {
            string sql = "insert into highscores (name, score) values (‘Me‘, 3000)";
            SQLiteCommand command = new SQLiteCommand(sql, m_dbConnection);
            command.ExecuteNonQuery();

            sql = "insert into highscores (name, score) values (‘Myself‘, 6000)";
            command = new SQLiteCommand(sql, m_dbConnection);
            command.ExecuteNonQuery();

            sql = "insert into highscores (name, score) values (‘And I‘, 9001)";
            command = new SQLiteCommand(sql, m_dbConnection);
            command.ExecuteNonQuery();
        }

        //使用sql查询语句，并显示结果
        public void printHighscores()
        {
            string sql = "select * from highscores order by score desc";
            SQLiteCommand command = new SQLiteCommand(sql, m_dbConnection);
            SQLiteDataReader reader = command.ExecuteReader();
            while (reader.Read())
                Console.WriteLine("Name: " + reader["name"] + "\tScore: " + reader["score"]);
            Console.ReadLine();
        }
    }
}

　　

eg：：

#region SQLite 操作（检查数据库和表格是否存在，不存在则创建）

//,如果数据库不存在，则创建数据库 MyDatabase
if (!File.Exists("MyDatabase.sqlite"))   SQLiteConnection.CreateFile("MyDatabase.sqlite");

//创建数据库MyDatabase的连接
SQLiteHelper _SQLiteHelper = new SQLiteHelper("Data Source=MyDatabase.sqlite;Version=3;DateTimeFormat=Ticks;");

//在MyDatabase数据库 执行-创建表格
_SQLiteHelper.ExecuteNonQuery(CommandType.Text, "CREATE TABLE IF NOT EXISTS highscores (name varchar(20), score int)");

////DataSet obj2 = _SQLiteHelper.ExecuteDataSet(CommandType.Text, "select * from highscores order by score desc");

////int dt2 = obj2.Tables[0].Rows.Count;

//////在MyDatabase数据库 执行-插入数据
////_SQLiteHelper.ExecuteNonQuery(CommandType.Text, "insert into highscores (name, score) values (‘Me‘, 3000)");
////_SQLiteHelper.ExecuteNonQuery(CommandType.Text, "insert into highscores (name, score) values (‘Me2‘, 3002)");
////_SQLiteHelper.ExecuteNonQuery(CommandType.Text, "insert into highscores (name, score) values (‘Me‘, 3000)");
////_SQLiteHelper.ExecuteNonQuery(CommandType.Text, "insert into highscores (name, score) values (‘Me2‘, 3002)");
////_SQLiteHelper.ExecuteNonQuery(CommandType.Text, "insert into highscores (name, score) values (‘Me‘, 3000)");
////_SQLiteHelper.ExecuteNonQuery(CommandType.Text, "insert into highscores (name, score) values (‘Me2‘, 3002)");
////_SQLiteHelper.ExecuteNonQuery(CommandType.Text, "insert into highscores (name, score) values (‘Me‘, 3000)");
////_SQLiteHelper.ExecuteNonQuery(CommandType.Text, "insert into highscores (name, score) values (‘Me2‘, 3002)");
////_SQLiteHelper.ExecuteNonQuery(CommandType.Text, "insert into highscores (name, score) values (‘Me‘, 3000)");
////_SQLiteHelper.ExecuteNonQuery(CommandType.Text, "insert into highscores (name, score) values (‘Me2‘, 3002)");
//////在MyDatabase数据库 执行-查询
////DataSet obj = _SQLiteHelper.ExecuteDataSet(CommandType.Text, "select * from highscores order by score desc");

//// int dt= obj.Tables[0].Rows.Count;
//////SQLiteMager ddds = new SQLiteMager();

#endregion