Question

我是PL SQL的新手。我想更新表行值。我想以xml格式从php获取值并更新特定的行值。所以我写这个pl sql函数和它的工作原理细即可。这是代码：

FUNCTION update_payroll_transaction(employeeData NVARCHAR2) RETURN CLOB IS

ret CLOB;
xmlData XMLType;
v_code NUMBER;
v_errm VARCHAR2(500);
num1 number(4,0);
BEGIN
xmlData:=XMLType(employeeData);
UPDATE payrollfile ep SET(
                      SALYR,
                      SALMT,
                      EMPID,
                      DPTID,
                      SALHD,
                      DESCRP,
                      ALAMT,
                      OPID,
                      TRADT) = (SELECT x.SALYR,
                      x.SALMT,
                      x.EMPID,
                      x.DPTID,
                      x.SALHD,
                      x.DESCRP,
                      x.ALAMT,
                      x.OPID,
                      x.TRADT FROM XMLTABLE('/transaction'
                                                PASSING xmlData
                                                COLUMNS  SALYR        NUMBER(4,0)     PATH    'salary_year',
                                                         SALMT        NUMBER(2,0)     PATH    'salary_month',
                                                         EMPID        NUMBER            PATH  'employee_id',
                                                         DPTID         NUMBER          PATH  'department_code',
                                                        SALHD         VARCHAR2(2)     PATH  'salary_head',
                                                        DESCRP         VARCHAR2(50)    PATH  'description',
                                                        ALAMT         FLOAT(126)      PATH  'amount',
                                                        OPID          NUMBER        PATH  'operator_id',
                                                        TRADT         DATE          PATH  'transaction_date') x
                    WHERE ep.EMPID=x.EMPID) WHERE EXISTS(SELECT 1 FROM XMLTABLE('/transaction'
                                                PASSING xmlData
                                                COLUMNS  SALYR        NUMBER(4,0)     PATH    'salary_year',
                                                         SALMT        NUMBER(2,0)     PATH    'salary_month',
                                                         EMPID        NUMBER            PATH  'employee_id',
                                                         DPTID         NUMBER          PATH  'department_code',
                                                        SALHD         VARCHAR2(2)     PATH  'salary_head',
                                                        DESCRP         VARCHAR2(50)    PATH  'description',
                                                        ALAMT         FLOAT(126)      PATH  'amount',
                                                        OPID          NUMBER        PATH  'operator_id',
                                                        TRADT         DATE          PATH  'transaction_date') x WHERE ep.EMPID=x.EMPID);

ret:=to_char(sql%rowcount);
COMMIT;

RETURN '<result><status affectedRow='||ret||'>success</status></result>';
DBMS_OUTPUT.PUT_LINE(ret);

END update_payroll_transaction;

这是我的php代码：

$stid = oci_parse($conn, " begin   
                               :result := PAYROLL.update_payroll_transaction('<transaction>
                                        <salary_year>$year</salary_year>
                                        <salary_month>$month</salary_month>
                                        <employee_id>$empID</employee_id>
                                        <department_code>$dptCode</department_code>
                                        <salary_head>$salHD</salary_head>
                                        <description>$description</description>
                                        <amount>$amount</amount>
                                        <operator_id>$optID</operator_id>
                                        <transaction_date>$trDate</transaction_date>
                                      </transaction>');                

                                end;" );    

    oci_bind_by_name($stid, ':result',$ru, 5000);   
    $output = oci_execute($stid);

我认为更新时间很长。是否可以最小化该代码。谢谢。

Answer 1

如果我是你，我会转而使用MERGE;这样做的好处是只能引用一次xmltable，而不是更新语句中的两次：

function update_payroll_transaction(employeedata nvarchar2)
return clob
is
  ret clob;
  xmldata xmltype;
  v_code number;
  v_errm varchar2(500);
  num1 number(4,0);
begin
  xmldata:=xmltype(employeedata);

  merge into payrollfile tgt
  using (select salyr,
                salmt,
                empid,
                dptid,
                salhd,
                descrp,
                alamt,
                opid,
                tradt
         from   xmltable('/transaction'
                         passing xmldata
                         columns salyr number(4,0) path 'salary_year',
                                 salmt number(2,0) path 'salary_month',
                                 empid number path 'employee_id',
                                 dptid number path 'department_code',
                                 salhd varchar2(2) path 'salary_head',
                                 descrp varchar2(50) path 'description',
                                 alamt float(126) path 'amount',
                                 opid number path 'operator_id',
                                 tradt date path 'transaction_date')) src
    on (tgt.empid = src.empid)
  when matched then
  update set tgt.salyr = src.salyr,
             tgt.salmt = src.salmt,
             tgt.empid = src.empid,
             tgt.dptid = src.dptid,
             tgt.salhd = src.salhd,
             tgt.descrp = src.descrp,
             tgt.alamt = src.alamt,
             tgt.opid = src.opid,
             tgt.tradt = src.tradt;

  ret:=to_char(sql%rowcount);

  commit;

  dbms_output.put_line(ret);

  return '<result><status affectedRow='||ret||'>success</status></result>';

end update_payroll_transaction;
/

如何最小化此pl sql更新

1 个答案: