Question

有没有办法实现像

这样的简单SELECT INTO语句

SELECT First_Name 
INTO :Name 
FROM Employees 
WHERE EMPLOYEE_ID = 2

使用ODP.NET返回值参数（“Name”）？

这是我尝试实现它的方法，但OracleCommand抛出1006异常：“ORA-01006：绑定变量不存在”

    public void getEmployee(int employee_id)
    {
        string cmdQuery = @"SELECT First_Name, Email, Salary INTO :FirstName, :EmailAddress, :CurrentSalary FROM EMPLOYEES WHERE employee_id = :Employee_id";
        trans_r = conn_r.BeginTransaction();
        try
        {
            OracleCommand cmd = new OracleCommand(cmdQuery, conn_u);
            cmd.BindByName = true;

            //WHERE Parameters
            OracleParameter paramDepartment_Id = new OracleParameter("Employee_id", employee_id);
            paramDepartment_Id.Direction = ParameterDirection.Input;
            cmd.Parameters.Add(paramDepartment_Id);

            //INTO Parameters
            OracleParameter param_Name_out = new OracleParameter("FirstName", OracleDbType.Varchar2, ParameterDirection.ReturnValue);
            cmd.Parameters.Add(param_Name_out);
            OracleParameter param_Email_out = new OracleParameter("EmailAddress", OracleDbType.Varchar2, ParameterDirection.ReturnValue);
            cmd.Parameters.Add(param_Email_out);
            OracleParameter param_Salary_out = new OracleParameter("CurrentSalary", OracleDbType.Int32, ParameterDirection.ReturnValue);
            cmd.Parameters.Add(param_Salary_out);

            OracleDataAdapter da = new OracleDataAdapter(cmd);
            OracleCommandBuilder cb = new OracleCommandBuilder(da);

            cmd.ExecuteReader();

        }
        catch (OracleException ex)
        {
            throw ex;
        }
    }

Answer 1

“SELECT INTO”实际上是PL / SQL语言的一部分，而不是SQL。因此，您需要使用匿名PL / SQL块（将其包装在BEGIN和END中）

示例代码： http://oradim.blogspot.com/2007/04/odpnet-tip-anonymous-plsql-and.html

另外，尝试使用ParameterDirection.Output而不是ParameterDirection.ReturnValue

Answer 2

任何时候ODP.net抛出一个未找到参数的错误，通常意味着参数名称不匹配，参数数量不正确，或者参数格式不正确。参数必须是＆＃34;：PARAM＆＃34;在param配置中以＆＃34;：＆＃34;

为前缀

 public void getEmployee(int employee_id)
{
    string cmdQuery = @"SELECT First_Name, Email, Salary INTO :FirstName, :EmailAddress, :CurrentSalary FROM EMPLOYEES WHERE employee_id = :Employee_id";
    trans_r = conn_r.BeginTransaction();
    try
    {
        OracleCommand cmd = new OracleCommand(cmdQuery, conn_u);
        cmd.BindByName = true;

        //WHERE Parameters
        OracleParameter paramDepartment_Id = new OracleParameter(":Employee_id", employee_id);
        paramDepartment_Id.Direction = ParameterDirection.Input;
        cmd.Parameters.Add(paramDepartment_Id);

        //INTO Parameters
        OracleParameter param_Name_out = new OracleParameter(":FirstName", OracleDbType.Varchar2, ParameterDirection.ReturnValue);
        cmd.Parameters.Add(param_Name_out);
        OracleParameter param_Email_out = new OracleParameter(":EmailAddress", OracleDbType.Varchar2, ParameterDirection.ReturnValue);
        cmd.Parameters.Add(param_Email_out);
        OracleParameter param_Salary_out = new OracleParameter(":CurrentSalary", OracleDbType.Int32, ParameterDirection.ReturnValue);
        cmd.Parameters.Add(param_Salary_out);

        OracleDataAdapter da = new OracleDataAdapter(cmd);
        OracleCommandBuilder cb = new OracleCommandBuilder(da);

        cmd.ExecuteReader();

    }
    catch (OracleException ex)
    {
        throw ex;
    }
}

ODP.NET和SELECT INTO语句

2 个答案: