原文:
http://tech.it168.com/oldarticle/2006-04-02/200604021512359.shtml
http://www.cnblogs.com/m-cnblogs/archive/2012/02/23/2364906.html
1.创建测试存储过程:
SQL> create or replace procedure proc_test(p1 IN varchar2,p2 OUT varchar2) is
2 begin
3 SELECT p1 INTO p2 FROM dual;
4 end proc_test;
5 /
过程被创建
2.主要C# 代码以及注意点:
using ORAC = System.Data.OracleClient;
private void button1_Click(object sender, System.EventArgs e)
{
try
{
string str_Sql = @"call proc_test(:p1,:p2)";
/*不能用:call proc_test(?,?)或者call proc_test(@p1,@p2),这样会报ORA-01036:非法的变量名/编号错误 */
ORAC.OracleCommand cmd = new ORAC.OracleCommand(str_Sql,this.oracleConnection1);
/*cmd.CommandType = CommandType.StoredProcedure;-注意这种方式调用存储过程,不能指定CommandType为StoredProcedure */
ORAC.OracleParameter pram1 = new ORAC.OracleParameter("p1",ORAC.OracleType.VarChar,10);
pram1.Value = "test";
cmd.Parameters.Add(pram1);
ORAC.OracleParameter pram2 = new ORAC.OracleParameter("p2",ORAC.OracleType.VarChar,10);
pram2.Direction =ParameterDirection.Output;
cmd.Parameters.Add(pram2);
if(this.oracleConnection1.State == System.Data.ConnectionState.Closed)
{
this.oracleConnection1.Open();
}
cmd.ExecuteNonQuery();
this.textBox1.Text = cmd.Parameters[1].Value.ToString();
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
this.oracleConnection1.Close();
}
}
参数说明
parameter.Value=赋值
当这个值为null时,不能直接赋值,负责页面就会报错:未将对象应用到对象的实例
当为null时需转化为System.DBNull.Value即可