更新时间:2021-11-16 00:13:18
我显然需要在 ApiDemo 示例中添加一个 SQLite 演示.
I obviously need to add a SQLite demo to the ApiDemo sample.
因为我不知道什么时候会发生,这里是快速和肮脏的版本:
Since I don't know when that'll happen, here's the quick and dirty version:
但是,要使用以下代码,您必须面向 Android 2.2 或更高版本才能使用 Mono.Data.Sqlite.如果您需要针对较早的 Android 版本,则应考虑完全托管的替代品,例如 managed-sqlite.
However, to use the following code you must be targeting Android 2.2 or later to use Mono.Data.Sqlite. If you need to target an earlier Android version, you should look into a fully managed replacement, such as managed-sqlite.
此外,此示例使用 Mono.Data.Sqlite.dll,包含在 MonoDroid SDK 中.
Furthermore, this example is using Mono.Data.Sqlite.dll, which is included in the MonoDroid SDK.
首先,编辑您的项目程序集引用并添加对Mono.Data.Sqlite.dll
和System.Data.dll
的引用.
First, edit your project assembly references and add a reference for Mono.Data.Sqlite.dll
and System.Data.dll
.
其次,在您的源代码中,添加:
Second, within your source code, add:
using System.Data;
using Mono.Data.Sqlite;
最后,使用普通的 ADO.NET 代码:
Finally, use ye normal ADO.NET code:
string dbPath = Path.Combine (
Environment.GetFolderPath (Environment.SpecialFolder.Personal),
"items.db3");
bool exists = File.Exists (dbPath);
if (!exists)
SqliteConnection.CreateFile (dbPath);
var connection = new SqliteConnection ("Data Source=" + dbPath);
connection.Open ();
if (!exists) {
// This is the first time the app has run and/or that we need the DB.
// Copy a "template" DB from your assets, or programmatically create one.
var commands = new[]{
"CREATE TABLE [Items] (Key ntext, Value ntext);",
"INSERT INTO [Items] ([Key], [Value]) VALUES ('sample', 'text')"
};
foreach (var command in commands) {
using (var c = connection.CreateCommand ()) {
c.CommandText = command;
c.ExecuteNonQuery ();
}
}
}
// use `connection`...
// here, we'll just append the contents to a TextView
using (var contents = connection.CreateCommand ()) {
contents.CommandText = "SELECT [Key], [Value] from [Items]";
var r = contents.ExecuteReader ();
while (r.Read ())
MyTextView.Text += string.Format ("
Key={0}; Value={1}",
r ["Key"].ToString (), r ["Value"].ToString ());
}
connection.Close ();