C#Sqlite中连接数据库演示实例

C# .net framwork 3.5 开发，源码，Sqlite数据库简单应用实例 C#中Sqlite数据库的创建、打开、建表、插入数据、提取数据 在Form DataGridView中显示Sqlite数据库内容 附最新System.Data.SQLite.Dll 适合初学者
提示：64位的Win7、win8 解决方案的生成目标平台设置为x86 
32位操作系统 解决方案的生成目标平台设置为AnyCPU  否则可能会报 “未能加载文件或程序集“XXX”或它的某一个依赖项。试图加载格式不正确的程序” 错误 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