C# 下sqlite簡單使用

1. 對數據庫增, 刪, 改

            //數據庫文件存儲路徑,(Environment.CurrentDirectory:為當前工作目錄的完全路徑)
            string dbPath = "Data Source =" + Environment.CurrentDirectory + "/test.db";
            //創建連接數據庫實例，指定文件位置  
            SQLiteConnection con = new SQLiteConnection(dbPath);
            //打開數據庫，若文件不存在會自動創建  
            con.Open();
            //建表語句  
            string sql = "CREATE TABLE IF NOT EXISTS student(id integer, name varchar(20), sex varchar(2));";
            //創建sql執行指令對象
            SQLiteCommand com = new SQLiteCommand(sql, con);
            //如果不帶參數時, 使用一下語句賦值
            //com.CommandText = sql;
            //com.Connection = con;
            //執行sql指令創建建數據表,如果表不存在，創建數據表  
            com.ExecuteNonQuery();

            //給表添加數據
            //1. 使用sql語句逐行添加
            com.CommandText = "INSERT INTO student VALUES(1, '小紅', '男')";
            com.ExecuteNonQuery();
            com.CommandText = "INSERT INTO student VALUES(2, '小李', '女')";
            com.ExecuteNonQuery();
            com.CommandText = "INSERT INTO student VALUES(3, '小明', '男')";
            com.ExecuteNonQuery();
            //2. 使用事務添加
            //實例化一個事務對象
            SQLiteTransaction tran = con.BeginTransaction();
            //把事務對象賦值給com的transaction屬性
            com.Transaction = tran;
            //設置帶參數sql語句
            com.CommandText = "INSERT INTO student VALUES(@id, @name, @sex)";
            for (int i = 0; i < 10; i++)
            {
                //添加參數
                com.Parameters.AddRange(new[] {//添加參數  
                           new SQLiteParameter("@id", i + 1),  
                           new SQLiteParameter("@name", "test" + i),  
                           new SQLiteParameter("@sex", i % 3 == 0 ? "男" : "女")  
                       });
                //執行添加
                com.ExecuteNonQuery();
            }
            //提交事務
            tran.Commit();
            //關閉數據庫
            con.Close();

　　2. 讀取數據

            //數據庫路徑
            string dbPath = "Data Source =" + Environment.CurrentDirectory + "/test.db";
            //創建數據庫實例，指定文件位置  
            SQLiteConnection conn = new SQLiteConnection(dbPath);
            //打開數據庫，若文件不存在會自動創建  
            conn.Open();
            //查詢sql語句
            string sql = "select * from student";
            //實例化sql指令對象
            SQLiteCommand cmdQ = new SQLiteCommand(sql, conn);
            //存放讀取數值
            SQLiteDataReader reader = cmdQ.ExecuteReader();
            //顯示數據的控件
            richTextBox1.Text = "";
            //讀取每一行數據
            while (reader.Read())
            {
                //讀取並賦值給控件
                richTextBox1.Text += reader.GetInt32(0) + " " + reader.GetString(1) + " " + reader.GetString(2) + "\n";
            }
            //關閉數據庫
            conn.Close();