问题摘要
通过Oracle.ManagedDataAccess使用Oracle数据库时遇到了奇怪的行为:应用程序的数据访问组件只看到从此应用程序添加的表数据。
重现的步骤
Oracle表:
CREATE TABLE TEST_TABLE (
"TIMESTAMP" DATE DEFAULT SYSDATE NOT NULL
)
测试应用:
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Before run, count = {0}", GetCount());
InsertNew();
Console.WriteLine("After app insert, count = {0}", GetCount());
Console.WriteLine("Insert row via SQL developer and press enter");
Console.Read();
Console.WriteLine("After SQL developer insert, count = {0}", GetCount());
Console.Read();
}
private static void InsertNew()
{
using (var connection = OpenConnection())
{
var command = new OracleCommand("INSERT INTO TEST_TABLE(TIMESTAMP) VALUES(:Timestamp)", connection);
command.Parameters.Add(new OracleParameter("Timestamp", OracleDbType.Date)).Value = DateTime.Now;
command.ExecuteNonQuery();
}
}
private static int GetCount()
{
using (var connection = OpenConnection())
{
var command = new OracleCommand("SELECT COUNT(1) FROM TEST_TABLE", connection);
return (int)(decimal)command.ExecuteScalar();
}
}
private static OracleConnection OpenConnection()
{
var connectionString = ConfigurationManager.ConnectionStrings["db"].ConnectionString;
var connection = new OracleConnection(connectionString);
connection.Open();
return connection;
}
}
当应用程序提示通过SQL开发人员插入行时,我运行
INSERT INTO TEST_TABLE(TIMESTAMP) VALUES(SYSDATE);
连接字符串如下所示:
Data Source=DATA_SOURCE_NAME;User Id=USER_ID;Password=PASS;
Oracle版本:10g(10.2.0.5.0) Oracle.ManagedDataAccess版本:4.121.2.0
结果
首次运行时,我得到结果:
Before run, count = 0
After app insert, count = 1
Insert row via SQL developer and press enter
After SQL developer insert, count = 1
第二轮我得到结果:
Before run, count = 1
After app insert, count = 2
Insert row via SQL developer and press enter
After SQL developer insert, count = 2
因此应用程序会看到它添加的数据,包括先前运行时添加的数据,但看不到通过SQL开发人员添加的数据
当通过SQL开发人员运行查询时,将返回所有数据
问题
所以问题是什么可能导致这种行为?以及如何确保应用程序可以获取所有数据?
答案 0 :(得分:0)
我找到了答案 - 重现的步骤缺少步骤"在SQL中按[Commit]"执行插入后。