C#中怎么利用匿名块获取获取序列当前值

这期内容当中小编将会给大家带来有关C#中怎么利用匿名块获取获取序列当前值，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。

1.在Oracle中建立表、序列、触发器：

SQL> create table TESTTAB     (       ID   NUMBER,       NAME VARCHAR2(10)     );

表被创建

SQL> create sequence TESTTABSEQ      minvalue 1      maxvalue 999999999999999999999999999     start with 1      increment by 1      cache 20;

序列被创建

SQL> create or replace trigger Tr_testtabid     before insert on testtab for each row            begin      SELECT TESTTABSEQ.NEXTVAL into :NEW.id from dual;       end Tr_testtabid;      /

触发器被创建

2.主要的C#绑定变量代码：

using ORAC = System.Data.OracleClient;          private void button1_Click(object sender, System.EventArgs e)                  {                          try                         {                                                            string str_Sql = @"begin insert into testtab(name) values('test'); select TESTTABSEQ.Currval into :ID from dual; end;";                                  ORAC.OracleCommand cmd= new ORAC.OracleCommand(str_Sql,this.oracleConnection1);                                   ORAC.OracleParameter parm = new ORAC.OracleParameter("ID",ORAC.OracleType.Number);                                  parm.Direction = ParameterDirection.Output;                                  cmd.Parameters.Add(parm);                                   if(this.oracleConnection1.State == System.Data.ConnectionState.Closed)                                  {                                          this.oracleConnection1.Open();                                  }                                  cmd.ExecuteNonQuery();                                    this.textBox1.Text = cmd.Parameters[0].Value.ToString();                          }                          catch(Exception ex)                          {                                  MessageBox.Show("发生错误！";                                                            }                          finally                         {                                  this.oracleConnection1.Close();                          }                                             }

上述就是小编为大家分享的C#中怎么利用匿名块获取获取序列当前值了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注亿速云行业资讯频道。