C#操作SQLite方法实例详解_C# 读sqlite_gridview

首先下载DLL文件

 

using System.Data.SQLite;

Connection和Command:

private SQLiteConnection conn; 
private SQLiteCommand cmd; 

连接db：

conn = new SQLiteConnection("Data Source=c:\\test.db"); 
 conn.Open(); 

INSERT/UPDATE:

cmd = conn.CreateCommand(); 
cmd.CommandText = "INSERT INTO user(email,name) VALUES ('email','name')"; 
cmd.ExecuteNonQuery(); 
  
cmd.CommandText = "UPDATE userSET name = 'Codelicious' WHERE ID = 1"; 
cmd.ExecuteNonQuery();

SELECT:

cmd.CommandText = "SELECT ID, name FROM user"; 
SQLiteDataReader reader = cmd.ExecuteReader(); 
if (reader.HasRows) 
{ 
  while (reader.Read()) 
  { 
   Console.WriteLine("ID: " + reader.GetInt16(0)); 
   Console.WriteLine("name: " + reader.GetString(1)); 
  } 
}

模板程序：

using System; 
using System.Data; 
using System.Data.Common; 
using System.Data.SQLite; 
namespace SQLiteQueryBrowser 
{ 
   /// <summary> 
   /// 说明：这是一个针对System.Data.SQLite的数据库常规操作封装的通用类。 
   /// </summary> 
   public class SQLiteDBHelper 
   { 
     private string connectionString = string.Empty; 
     /// <summary> 
     /// 构造函数 
     /// </summary> 
     /// <param name="dbPath">SQLite数据库文件路径</param> 
     public SQLiteDBHelper(string dbPath) 
     { 
       this.connectionString = "Data Source=" + dbPath; 
     } 
     /// <summary> 
     /// 创建SQLite数据库文件 
     /// </summary> 
     /// <param name="dbPath">要创建的SQLite数据库文件路径</param> 
     public static void CreateDB(string dbPath) 
     { 
       using (SQLiteConnection connection = new SQLiteConnection("Data Source=" + dbPath)) 
       { 
         connection.Open(); 
         using (SQLiteCommand command = new SQLiteCommand(connection)) 
         { 
           command.CommandText = "CREATE TABLE Demo(id integer NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE)"; 
           command.ExecuteNonQuery(); 
           command.CommandText = "DROP TABLE Demo"; 
           command.ExecuteNonQuery(); 
         } 
       } 
     } 
     /// <summary> 
     /// 对SQLite数据库执行增删改操作，返回受影响的行数。 
     /// </summary> 
     /// <param name="sql">要执行的增删改的SQL语句</param> 
     /// <param name="parameters">执行增删改语句所需要的参数，参数必须以它们在SQL语句中的顺序为准</param> 
     /// <returns></returns> 
     public int ExecuteNonQuery(string sql, SQLiteParameter[] parameters) 
     { 
       int affectedRows = 0; 
       using (SQLiteConnection connection = new SQLiteConnection(connectionString)) 
       { 
         connection.Open(); 
         using (DbTransaction transaction = connection.BeginTransaction()) 
         { 
           using (SQLiteCommand command = new SQLiteCommand(connection)) 
           { 
             command.CommandText = sql; 
             if (parameters != null) 
             { 
               command.Parameters.AddRange(parameters); 
             } 
             affectedRows = command.ExecuteNonQuery(); 
           } 
           transaction.Commit(); 
         } 
       } 
       return affectedRows; 
     } 
     /// <summary> 
     /// 执行一个查询语句，返回一个关联的SQLiteDataReader实例 
     /// </summary> 
     /// <param name="sql">要执行的查询语句</param> 
     /// <param name="parameters">执行SQL查询语句所需要的参数，参数必须以它们在SQL语句中的顺序为准</param> 
     /// <returns></returns> 
     public SQLiteDataReader ExecuteReader(string sql, SQLiteParameter[] parameters) 
     { 
       SQLiteConnection connection = new SQLiteConnection(connectionString); 
       SQLiteCommand command = new SQLiteCommand(sql, connection); 
       if (parameters != null) 
       { 
         command.Parameters.AddRange(parameters); 
       } 
       connection.Open(); 
       return command.ExecuteReader(CommandBehavior.CloseConnection); 
     } 
     /// <summary> 
     /// 执行一个查询语句，返回一个包含查询结果的DataTable 
     /// </summary> 
     /// <param name="sql">要执行的查询语句</param> 
     /// <param name="parameters">执行SQL查询语句所需要的参数，参数必须以它们在SQL语句中的顺序为准</param> 
     /// <returns></returns> 
     public DataTable ExecuteDataTable(string sql, SQLiteParameter[] parameters) 
     { 
       using (SQLiteConnection connection = new SQLiteConnection(connectionString)) 
       { 
         using (SQLiteCommand command = new SQLiteCommand(sql, connection)) 
         { 
           if (parameters != null) 
           { 
             command.Parameters.AddRange(parameters); 
           } 
           SQLiteDataAdapter adapter = new SQLiteDataAdapter(command); 
           DataTable data = new DataTable(); 
           adapter.Fill(data); 
           return data; 
         } 
       } 
     } 
     /// <summary> 
     /// 执行一个查询语句，返回查询结果的第一行第一列 
     /// </summary> 
     /// <param name="sql">要执行的查询语句</param> 
     /// <param name="parameters">执行SQL查询语句所需要的参数，参数必须以它们在SQL语句中的顺序为准</param> 
     /// <returns></returns> 
     public Object ExecuteScalar(string sql, SQLiteParameter[] parameters) 
     { 
       using (SQLiteConnection connection = new SQLiteConnection(connectionString)) 
       { 
         using (SQLiteCommand command = new SQLiteCommand(sql, connection)) 
         { 
           if (parameters != null) 
           { 
             command.Parameters.AddRange(parameters); 
           } 
           SQLiteDataAdapter adapter = new SQLiteDataAdapter(command); 
           DataTable data = new DataTable(); 
           adapter.Fill(data); 
           return data; 
         } 
       } 
     } 
     /// <summary> 
     /// 查询数据库中的所有数据类型信息 
     /// </summary> 
     /// <returns></returns> 
     public DataTable GetSchema() 
     { 
       using (SQLiteConnection connection = new SQLiteConnection(connectionString)) 
       { 
         connection.Open(); 
         DataTable data=connection.GetSchema("TABLES"); 
         connection.Close(); 
         //foreach (DataColumn column in data.Columns) 
         //{ 
         //  Console.WriteLine(column.ColumnName); 
         //} 
         return data; 
       } 
     } 
   } 
}

完整的程序例子：

using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Data; 
using System.Data.Common; 
using System.Data.SQLite; 
using SQLiteQueryBrowser; 
namespace SQLiteDemo 
{ 
   class Program 
   { 
     static void Main(string[] args) 
     { 
       //CreateTable(); 
       //InsertData(); 
       ShowData(); 
       Console.ReadLine(); 
     } 
     public static void CreateTable() 
     { 
       string dbPath = "D:\\Demo.db3"; 
       //如果不存在改数据库文件，则创建该数据库文件 
       if (!System.IO.File.Exists(dbPath)) 
       { 
         SQLiteDBHelper.CreateDB("D:\\Demo.db3"); 
       } 
       SQLiteDBHelper db = new SQLiteDBHelper("D:\\Demo.db3"); 
       string sql = "CREATE TABLE Test3(id integer NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,Name char(3),TypeName varchar(50),addDate datetime,UpdateTime Date,Time time,Comments blob)"; 
       db.ExecuteNonQuery(sql, null); 
     } 
     public static void InsertData() 
     { 
       string sql = "INSERT INTO Test3(Name,TypeName,addDate,UpdateTime,Time,Comments)values(@Name,@TypeName,@addDate,@UpdateTime,@Time,@Comments)"; 
       SQLiteDBHelper db = new SQLiteDBHelper("D:\\Demo.db3"); 
       for (char c = "A"; c <= "Z"; c++) 
       { 
         for (int i = 0; i < 100; i++) 
         { 
           SQLiteParameter[] parameters = new SQLiteParameter[]{ 
             new SQLiteParameter("@Name",c+i.ToString()), 
           new SQLiteParameter("@TypeName",c.ToString()), 
           new SQLiteParameter("@addDate",DateTime.Now), 
           new SQLiteParameter("@UpdateTime",DateTime.Now.Date), 
           new SQLiteParameter("@Time",DateTime.Now.ToShortTimeString()), 
           new SQLiteParameter("@Comments","Just a Test"+i) 
           }; 
           db.ExecuteNonQuery(sql, parameters); 
         } 
       } 
     } 
     public static void ShowData() 
     { 
       //查询从50条起的20条记录 
       string sql = "select * from test3 order by id desc limit 50 offset 20"; 
       SQLiteDBHelper db = new SQLiteDBHelper("D:\\Demo.db3"); 
       using (SQLiteDataReader reader = db.ExecuteReader(sql, null)) 
       { 
         while (reader.Read()) 
         { 
           Console.WriteLine("ID:{0},TypeName{1}", reader.GetInt64(0), reader.GetString(1)); 
         } 
       } 
     } 
   } 
 }