Question

我想连接到SQLite数据库。请告诉我WORKS的示例代码。此外，我想将datagridview与数据库链接。我使用此代码，但它不起作用：

private DataTable dt;
public Form1()
{
    InitializeComponent();
    this.dt = new DataTable();
}
private SQLiteConnection SQLiteConnection;
private void DataClass()
{
    SQLiteConnection = new SQLiteConnection("Data Source=PasswordManager.s3db;Version=3;");
}
private void GetData()
{
    SQLiteDataAdapter DataAdapter;
    try
    {
    SQLiteCommand cmd;
    SQLiteConnection.Open();  //Initiate connection to the db
    cmd = SQLiteConnection.CreateCommand();
    cmd.CommandText = "select*from PasswordManager;";  //set the passed query
    DataAdapter = new SQLiteDataAdapter(cmd);
    DataAdapter.Fill(dt); //fill the datasource
    dataGridView1.DataSource = dt;
}
catch(SQLiteException ex)
{
    //Add your exception code here.
}
SQLiteConnection.Close();

Answer 1

您可以使用System.Data.SQLite ADO.NET提供程序。下载并引用程序集后，它就是非常简单的ADO.NET代码：

using (var conn = new SQLiteConnection(@"Data Source=test.db3"))
using (var cmd = conn.CreateCommand())
{
    conn.Open();
    cmd.CommandText = "SELECT id FROM foo";
    using (var reader = cmd.ExecuteReader())
    {
        while (reader.Read())
        {
            int id = reader.GetInt32(reader.GetOrdinal("id"));
            ...
        }
    }
}

Answer 2

除了Darin提供的答案之外，SQLite中没有“create database”命令（从我记忆中）。当您启动“SQLiteConnection”时，如果给定的数据库（.db3）不存在，它会自动创建它......然后，您可以在那里创建表。

如何将C＃app与SQLite数据库连接

2 个答案: