我正在尝试实现 SQlite 3 数据库的嵌套事务支持。我的应用程序通过 API 执行 CRUD 操作,并且还具有其他操作(并行功能)。在 Short 数据库中,大部分时间都很忙,我收到“SQlite 不支持嵌套事务”的异常。
我尝试使用 Microsoft.Data.SQLite.Savepoints() 解决此问题,但并不适合所有场景。现在我发现 System.Data.SQLite.SQLiteTransaction2 类确实支持嵌套事务,但我不知道如何实现它。
using System;
using System.Data.SQLite;
namespace NestedTransactions
{
class Program
{
static void Main(string[] args)
{
using (var conn = new SQLiteConnection("Data Source=:memory:"))
{
conn.Open();
using (var trans = conn.BeginTransaction(IsolationLevel.Serializable))
{
try
{
// Start a nested transaction
using (var nestedTrans = trans.BeginTransaction(IsolationLevel.Serializable))
{
// Execute SQL statements in the nested transaction
ExecuteSql(conn, "INSERT INTO MyTable (Col1, Col2) VALUES (1, 'One')", nestedTrans);
ExecuteSql(conn, "INSERT INTO MyTable (Col1, Col2) VALUES (2, 'Two')", nestedTrans);
// Rollback the nested transaction if necessary
if (ShouldRollback(nestedTrans))
{
nestedTrans.Rollback();
}
}
// Execute SQL statements in the outer transaction
ExecuteSql(conn, "INSERT INTO MyTable (Col1, Col2) VALUES (3, 'Three')", trans);
ExecuteSql(conn, "INSERT INTO MyTable (Col1, Col2) VALUES (4, 'Four')", trans);
// Commit the outer transaction
trans.Commit();
}
catch (Exception)
{
// Rollback the outer transaction if necessary
if (!trans.Rollback())
{
throw;
}
}
}
}
}
private static void ExecuteSql(SQLiteConnection conn, string sql, SQLiteTransaction trans)
{
using (var cmd = conn.CreateCommand())
{
cmd.Transaction = trans;
cmd.CommandText = sql;
cmd.ExecuteNonQuery();
}
}
private static bool ShouldRollback(SQLiteTransaction trans)
{
// Check if a random number generator returns true
return new Random().Next(10) == 5;
}
}
}