使用C#对SQLLite进行操作

1.数据库连接（常用连接方法，示例）

1). 添加引用: System.Data.SQLite.DLL 。
2). 打开或创建数据库文件: SQLiteConnection.CreateFile(fileName);
3). 连接数据库: var connection = new SQLiteConnection(connectionString);
connectionString 中包含了数据库的一些配置信息，比如数据库文件路径，数据库密码等，可用 SQLiteConnectionStringBuilder 来创建 connectionString

 string dbPath = Environment.CurrentDirectory + "/test.db";/*指定数据库路径 */
 using(SQLiteConnection conn = new SQLiteConnection("Data Source =" + dbPath))
  {
      conn.Open();
      DbCommand comm = conn.CreateCommand();
      comm.CommandText = "select * from customer";
      comm.CommandType = CommandType.Text;
      using (IDataReader reader = comm.ExecuteReader())
      {
         while (reader.Read())
         {
           Response.Write(reader[]);
         }
       }
   }

在web.config或者是app.config中添加如下配置,connectionstring配置节的db就是 SQLite的数据库文件，将它放在Web应用的App_Data目录，|DataDirectory|就代表这个目录的位置，

后面的就是文件名,剩下的就是我们使用企业库访问SQL Server是一样的了。

<configuration>
    <configSections>
      <section name="dataConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings,
Microsoft.Practices.EnterpriseLibrary.Data, Version=4.1.0.0, Culture=neutral, PublicKeyToken=null />
    </configSections>
    <dataConfiguration defaultDatabase="

  ">
       <providerMappings>
        <add databaseType="EntLibContrib.Data.SQLite.SQLiteDatabase, EntLibContrib.Data.SqLite, Version=4.1.0.0, Culture=neutral, PublicKeyToken=null"
          name="System.Data.SQLite" />
      </providerMappings>
    </dataConfiguration>
    <connectionStrings>
      <add name="sqlite" connectionString="Data Source=|DataDirectory|\db;Pooling=true;FailIfMissing=false"
        providerName="System.Data.SQLite" />
    </connectionStrings>
  </configuration>

 在该工程上引入System.Data.SQLite.DLL（即wrapper），无需引入SQLite3.dll，因为前者已经包装了后者。 
    在代码中import下： "using System.Data.SQLite;" 

 using System;
 using System.Collections.Generic;
 using System.Text;
 using System.Data.SQLite;

 namespace TestSQLite
 {
     class MyCSharpSQLite
     {
         private static string connStr;

         static void Main(string[] args)
         {

            connStr = SQLiteConnectionString.GetConnectionString(".\\Data\\EasyDataBase.db");
            Console.WriteLine("SQLite Connect String is : {0}", connStr);

            //连接测试
            //testConnect(connStr);

            //执行查询
            ExecQuery("select * from customers");

            Console.ReadKey();
         }       

         private static void testConnect(string connStr)
         {
             try
            {
                SQLiteConnection conn = new SQLiteConnection(connStr);

                conn.Open();
                Console.WriteLine("SQLite Connect OK.");
            }
            catch (Exception ex)
            {
                Console.WriteLine("SQLite Connect fail: {0} ", ex.Message);
            }
         }

         private static void ExecQuery(string sqlStr)
          {
              Console.WriteLine(">> Start to query the database....");
              using (SQLiteConnection conn = new SQLiteConnection(connStr))
              {
                  conn.Open();
                  SQLiteCommand comm = conn.CreateCommand();
                  comm.CommandText = sqlStr;
                  //comm.CommandType = comm.CommandText;

                  using (SQLiteDataReader reader = comm.ExecuteReader())
                  {
                      while (reader.Read())
                      {
                          Console.WriteLine(reader[].ToString());
                      }
                  }
              }
          }

     }

     /// <summary>

     /// 生成SQLite连接字符串

     /// </summary>

     public static class SQLiteConnectionString
     {

         public static string GetConnectionString(string path)
         {
               return GetConnectionString(path, null);
         }

         public static string GetConnectionString(string path, string password)
         {
             if (string.IsNullOrEmpty(password))
             {
                 return "Data Source=" + path;
             }
             else
             {
                 return "Data Source=" + path + ";Password=" + password;
             }
         }

      }
 }

示例1

 using System;
 using System.Reflection;
 using System.IO;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Text;
 using System.Windows.Forms;
 using System.Data.SQLite; //需要安装sqlite for vs
 namespace MobileTest
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }

         public DataSet GetData()
         {
             try
             {
                 //得到数据库位置
                 string dbfile = string.Format("{0}\\SqlLiteTest", Path.GetDirectoryName(Assembly.GetExecutingAssembly().GetName().CodeBase));
                 //连接字符串
                 string connStr = string.Format("Data Source={0};Password=123456", dbfile);
                 SQLiteConnection conn = new SQLiteConnection(connStr);
                 string sql = "SELECT Id,Name,age FROM tbl_liteTest";
                 SQLiteDataAdapter slda = new SQLiteDataAdapter(sql, conn);
                 DataSet ds = new DataSet();
                 slda.Fill(ds);
                 return ds;
             }
             catch (Exception)
             {

                 throw;
             }
         }
         private void Form1_Load(object sender, EventArgs e)
         {
             DataSet ds = GetData();
             foreach (DataRow item in ds.Tables[].Rows)
          {
                 this.comboBox1.Items.Add(item["Name"].ToString());
          }
         }
         }
 }

示例2

 SQLiteConnection cnn = new SQLiteConnection();
             cnn.ConnectionString = @"Data Source=c:sqlite-3_5_0mytest.db";
             cnn.Open();

             SQLiteCommand cmd = new SQLiteCommand();
             cmd.Connection = cnn;
             cmd.CommandText = "SELECT * FROM mytable1";
             SQLiteDataAdapter da = new SQLiteDataAdapter();
             da.SelectCommand = cmd;
             DataSet ds = new DataSet();
             da.Fill(ds);

示例3

下载ADO.NET2.0 Provider for SQLite。下载binaries zip版就可以了。下载完后解压缩，可以在bin目录下找到System.Data.SQLite.DLL。在vs2008中用Add Reference功能把System.Data.SQLite.DLL加到工程里就可以了。

 string datasource = "d:/sqllite/sqlite.net/bin/test.db3";
            system.data.sqlite.sqliteconnection.createfile(datasource);
            //连接数据库
            system.data.sqlite.sqliteconnection conn = new system.data.sqlite.sqliteconnection();
            system.data.sqlite.sqliteconnectionstringbuilder connstr = new system.data.sqlite.sqliteconnectionstringbuilder();
            connstr.datasource = datasource;
            connstr.password = "admin";//设置密码，sqlite ado.net实现了数据库密码保护
            conn.connectionstring = connstr.tostring();
            conn.open();
            //创建表
            system.data.sqlite.sqlitecommand cmd = new system.data.sqlite.sqlitecommand();
            string sql = "create table test(username varchar(20),password varchar(20))";
            cmd.commandtext = sql;
            cmd.connection = conn;
            cmd.executenonquery();
            //插入数据
            sql = "insert into test values('a','b')";
            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()).append("\n")
                .append("password:").append(reader.getstring());
            }
            console.writeline(sb.tostring());
            console.read();

2.C#对SQLLite的DML操作示例

/*这里新建了一个HyData目录存放数据库*/
string connStr = @"Data Source=" + System.Environment.CurrentDirectory + @"\HyData\HyData.db3;Initial Catalog=sqlite;Integrated Security=True;Max Pool Size=10";

/*执行Sql语句
  创建一个表：  ExecuteSql("create table HyTest(TestID TEXT)");
  插入些数据：  ExecuteSql("insert into HyTest(TestID) values('1001')");
*/
private void ExecuteSql(string sqlStr)
{
    using (DbConnection conn = new SQLiteConnection(connStr))
    {
        conn.Open();
        DbCommand comm = conn.CreateCommand();
        comm.CommandText = sqlStr;
        comm.CommandType = CommandType.Text;
        comm.ExecuteNonQuery();
    }
}

/*执行查询
  ExecQuery("select * from HyTest");
*/
private void ExecQuery(string sqlStr)
{
    using (DbConnection conn = new SQLiteConnection(connStr))
    {
        conn.Open();
        DbCommand comm = conn.CreateCommand();
        comm.CommandText = sqlStr;
        comm.CommandType = CommandType.Text;

        using (IDataReader reader = comm.ExecuteReader())
        {
            while (reader.Read())
            {
                MessageBox.Show(reader[].ToString());
            }
        }
    }
}

 /* 执行查询返回DataSet */

private DataSet ExecDataSet(string sqlStr)
{
    using (SQLiteConnection conn = new SQLiteConnection(connStr))
    {
        conn.Open();
        SQLiteCommand cmd = conn.CreateCommand();
        cmd.CommandText = sqlStr;
        cmd.CommandType = CommandType.Text;

        SQLiteDataAdapter da = new SQLiteDataAdapter(cmd);
        DataSet ds = new DataSet();
        da.Fill(ds);

        return ds;
    }
}

System.Data.SQLite.SQLiteConnection conn =new System.Data.SQLite.SQLiteConnection(@"Data Source=d:\maindb.db;Version=3");

string datasource = "d:\\maindb.db";
            //连接数据库
            System.Data.SQLite.SQLiteConnection conn =new System.Data.SQLite.SQLiteConnection();
            System.Data.SQLite.SQLiteConnectionStringBuilder connstr = new System.Data.SQLite.SQLiteConnectionStringBuilder();
            connstr.DataSource = datasource;
            conn.ConnectionString = connstr.ToString();
            conn.Open();
            System.Data.SQLite.SQLiteCommand cmd = new System.Data.SQLite.SQLiteCommand();
            //取出数据
            string sql = "SELECT * FROM Source";
            cmd.CommandText = sql;
            System.Data.SQLite.SQLiteDataReader reader = cmd.ExecuteReader();
            StringBuilder sb = new StringBuilder();
            while (reader.Read())
            {
                sb.Append("ID:").Append(reader.GetString()).Append("\n")
                .Append("NAME:").Append(reader.GetString());

            }
            MessageBox.Show(sb.ToString());

3.对SQLLite DML操作类封装