Sqlite 连接数据库 示例代码

【核心代码】

using System;
using System.Data;
using System.Data.SQLite;
using System.Text;
using System.Windows.Forms;


namespace SqliteView
{
    public partial class FormView : Form
    {
        System.Data.SQLite.SQLiteConnection CONN = new System.Data.SQLite.SQLiteConnection();
        System.Data.SQLite.SQLiteConnectionStringBuilder CONNStr = new System.Data.SQLite.SQLiteConnectionStringBuilder();
        System.Data.SQLite.SQLiteCommand CMD = new System.Data.SQLite.SQLiteCommand();
        System.Data.SQLite.SQLiteDataAdapter DA = new SQLiteDataAdapter();
        System.Data.DataSet DS = new DataSet("DS1");

        string DataSource = "";
        string SQL = "";


        public FormView()
        {
            InitializeComponent();
            this.textBox1.Text = "select field2 from demo";
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void FormView_Load(object sender, EventArgs e)
        {
            try
            {
                DataSource = "Demo.db";
;
                CONNStr.DataSource = DataSource;
                //CONNStr.Password = "admin";//设置密码，SQLite ADO.NET实现了数据库密码保护  (似乎与SqliteManager有冲突)
                CONN.ConnectionString = CONNStr.ToString();
                CONN.Open();
                CMD.Connection = CONN;

                SQL = "select * from demo";
                showview(SQL, this.dataGridView1);

            }
            catch (Exception e1)
            {
                MessageBox.Show(e1.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }

        }

        private void showview(string sql,DataGridView dgv)
        {
            try
            {
                DS.Tables.Clear();

                CMD.CommandText = sql;
                CMD.ExecuteNonQuery();

                DA.SelectCommand = CMD;
                DA.Fill(DS);

                dgv.DataSource = DS.Tables[0];
            }
            catch (Exception e1)
            {
                MessageBox.Show(e1.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void testdb()
        {
            try
            {
                string datasource = "tmp_demo.db";

                //创建数据库
                System.Data.SQLite.SQLiteConnection.CreateFile(datasource);

                //打开数据库
                System.Data.SQLite.SQLiteConnection conn = new System.Data.SQLite.SQLiteConnection();
                System.Data.SQLite.SQLiteConnectionStringBuilder connstr = new System.Data.SQLite.SQLiteConnectionStringBuilder();
                System.Data.SQLite.SQLiteCommand cmd = new System.Data.SQLite.SQLiteCommand();
                connstr.DataSource = datasource;
                //connstr.Password = "admin";//设置密码，SQLite ADO.NET实现了数据库密码保护  (似乎与SqliteManager有冲突)
                conn.ConnectionString = connstr.ToString();
                conn.Open();

                cmd.Connection = conn;

                //建表
                string sql = "CREATE TABLE test(username varchar(20),password varchar(20))";
                cmd.CommandText = sql;
                cmd.ExecuteNonQuery();

                //插入数据
                sql = "INSERT INTO test VALUES('dotnetthink','mypassword')";
                cmd.CommandText = sql;
                cmd.ExecuteNonQuery();

                //取出数据
                sql = "SELECT * FROM test";
                cmd.CommandText = sql;
                System.Data.SQLite.SQLiteDataReader reader = cmd.ExecuteReader();

                StringBuilder sb = new StringBuilder();
                while (reader.Read())
                {
                    sb.Append("username:").Append(reader.GetString(0)).Append("\n");
                    sb.Append("password:").Append(reader.GetString(1));
                }
                MessageBox.Show(sb.ToString());

                reader.Close();
                conn.Close();
            }
            catch (Exception e1)
            {
                MessageBox.Show(e1.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void buttonRun_Click(object sender, EventArgs e)
        {
            SQL = this.textBox1.Text.Trim();
            showview(SQL, dataGridView1);
            this.textBox1.Focus();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            CONN.Close();
            Close();
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            this.testdb();
        }



    }//end Class FormView


}//end namespace SqliteView