C#操作SQLite数据库

文章目录

- 1、C#操作SQLite数据库的帮助类
- 2、使用示例
- - [2.1 项目中引用SQLite类库](#2.1 项目中引用SQLite类库)
  - [2.2 操作数据库示例](#2.2 操作数据库示例)

1、C#操作SQLite数据库的帮助类

csharp 复制代码

public static class SQLiteHelper
{
    public static string ConStr = "";
    public static int Update(string sql)
    {
        SQLiteConnection DBConnection = new SQLiteConnection(ConStr);
        SQLiteCommand cmd = new SQLiteCommand(sql, DBConnection);
        try
        {
            DBConnection.Open();
            return cmd.ExecuteNonQuery();
        }
        catch (Exception ex)
        {
            throw ex;
        }
        finally
        {
            DBConnection.Close();
        }
    }

    public static object GetSingleResult(string sql)
    {
        SQLiteConnection DBConnection = new SQLiteConnection(ConStr);
        SQLiteCommand cmd = new SQLiteCommand(sql, DBConnection);
        try
        {
            DBConnection.Open();
            return cmd.ExecuteScalar();
        }
        catch (Exception ex)
        {

            throw ex;
        }
        finally
        {
            DBConnection.Close();
        }
    }
    public static SQLiteDataReader GetReader(string sql)
    {
        SQLiteConnection DBConnection = new SQLiteConnection(ConStr);
        SQLiteCommand cmd = new SQLiteCommand(sql, DBConnection);
        try
        {
            DBConnection.Open();
            return cmd.ExecuteReader(CommandBehavior.CloseConnection);
        }
        catch (Exception ex)
        {
            DBConnection.Close();
            throw ex;
        }


    }
    public static DataSet GetDataSet(string sql)
    {
        SQLiteConnection DBConnection = new SQLiteConnection(ConStr);
        SQLiteCommand cmd = new SQLiteCommand(sql, DBConnection);
        SQLiteDataAdapter da = new SQLiteDataAdapter(cmd);
        DataSet ds = new DataSet();
        try
        {
            DBConnection.Open();
            da.Fill(ds);
            return ds;
        }
        catch (Exception)
        {
            return null;
        }
        finally
        {
            DBConnection.Close();
        }
    }
}

2、使用示例

2.1 项目中引用SQLite类库

在项目中引用System.Data.SQLite，或者直接去官网下载https://www.sqlite.org/index.html，完成之后，新建一个数据库文件，并加载到VS里面，如下图：

一般要用的SQL语句，都会在这里面测试好，再通过程序调用。

2.2 操作数据库示例

在其他类里面直接调用帮助类，也可以在窗体加载时调用

csharp 复制代码

private void Server_Load(object sender, EventArgs e)
{

  SQLiteHelper.ConStr= "Data Source=" + Application.StartupPath + "\\DataBase\\ScadaDataBase;Pooling=true;FailIfMissing=false"; 
  string sql1 = "insert into SysAdmins(LoginID, LoginName, LoginPwd, Role) values('10006', 'CFO', '008', '9')";
  int rtn =SQLiteHelper.Update(sql1);
}

运行一下，数据库里就插入了一条数据。