并发冲突：UpdateCommand影响了预期的1条记录中的0条

这是代码，为什么我得到这个错误的任何想法？

private SQLiteDataAdapter DA_Webfiles; // Setup connection, fill dataset etc DataTable dt = this.dataSet.Tables["WEBFILES"]; DataRow newRow = dt.NewRow(); newRow["PATH"] = _url; dt.Rows.Add(newRow); this.DA_Webfiles.Update(this.dataSet, "WEBFILES"); // Works to Here newRow["CONTENT_TYPE"] = "Test Content Type"; this.DA_Webfiles.Update(this.dataSet, "WEBFILES"); // Get ERROR here - Concurrency violation: the UpdateCommand affected 0 of the expected 1 records 

Answer 1

你需要：dataAdapter.InsertCommand.UpdatedRowSource = UpdateRowSource.FirstReturnedRecord;

得到代码线索： 检索身份或自动值（ADO.NET）

桌子：

 CREATE TABLE [emp] ( [emp_id] INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, [emp_firstname] VARCHAR(100) NOT NULL, [emp_lastname] varchar(100) not null ) 

代码：

 public partial class Form1 : Form { public Form1() { InitializeComponent(); var c = Connect(); var da = new SQLiteDataAdapter("select emp_id, emp_firstname, emp_lastname from emp where 1 = 0", c); var b = new SQLiteCommandBuilder(da); da.InsertCommand = new SQLiteCommand( @"insert into emp(emp_firstname, emp_lastname ) values(:_emp_firstname, :_emp_lastname); select emp_id /* include rowversion field here if you need */ from emp where emp_id = last_insert_rowid();", c); da.InsertCommand.Parameters.Add("_emp_firstname", DbType.String, 0, "emp_firstname"); da.InsertCommand.Parameters.Add("_emp_lastname", DbType.String, 0, "emp_lastname"); da.InsertCommand.UpdatedRowSource = UpdateRowSource.FirstReturnedRecord; da.UpdateCommand = b.GetUpdateCommand(); da.DeleteCommand = b.GetDeleteCommand(); var dt = new DataTable(); da.Fill(dt); var nr = dt.NewRow(); nr["emp_firstname"] = "john"; nr["emp_lastname"] = "lennon"; dt.Rows.Add(nr); da.Update(dt); dt.AcceptChanges(); nr["emp_lastname"] = "valjean"; da.Update(dt); } SQLiteConnection Connect() { return new SQLiteConnection(@"Data Source=../../test.s3db;Version=3;"); } } 

上面的代码也适用于多插入。 概念certificate代码：

 public partial class Form1 : Form { public Form1() { InitializeComponent(); var c = Connect(); var da = new SQLiteDataAdapter("select emp_id, emp_firstname, emp_lastname from emp where 1 = 0", c); var b = new SQLiteCommandBuilder(da); da.InsertCommand = new SQLiteCommand( @"insert into emp(emp_firstname, emp_lastname ) values(:_emp_firstname, :_emp_lastname); select emp_id /* include rowversion field here if you need */ from emp where emp_id = last_insert_rowid();", c); da.InsertCommand.Parameters.Add("_emp_firstname", DbType.String, 0, "emp_firstname"); da.InsertCommand.Parameters.Add("_emp_lastname", DbType.String, 0, "emp_lastname"); da.InsertCommand.UpdatedRowSource = UpdateRowSource.FirstReturnedRecord; da.UpdateCommand = b.GetUpdateCommand(); da.DeleteCommand = b.GetDeleteCommand(); var dt = new DataTable(); da.Fill(dt); var nr = dt.NewRow(); nr["emp_firstname"] = "john"; nr["emp_lastname"] = "lennon"; var nrx = dt.NewRow(); nrx["emp_firstname"] = "paul"; nrx["emp_lastname"] = "mccartney"; dt.Rows.Add(nr); dt.Rows.Add(nrx); da.Update(dt); dt.AcceptChanges(); nrx["emp_lastname"] = "simon"; da.Update(dt); nr["emp_lastname"] = "valjean"; da.Update(dt); } SQLiteConnection Connect() { return new SQLiteConnection(@"Data Source=../../test.s3db;Version=3;"); } }