demonstrates the effect of duplicate placeholders with EXECUTE IMMEDIATE. : Execute Immediate « PL SQL « Oracle PL / SQL






  1. Oracle PL / SQL
  2. PL SQL
  3. Execute Immediate

demonstrates the effect of duplicate placeholders with EXECUTE IMMEDIATE.

  
SQL>
SQL>
SQL> CREATE TABLE duplicates (
  2    f1 NUMBER,
  3    f2 NUMBER,
  4    f3 NUMBER,
  5    f4 NUMBER);

Table created.

SQL>
SQL> DECLARE
  2    v_InsertStmt VARCHAR2(100);
  3    v_f1 NUMBER := 1;
  4    v_f2 NUMBER := 2;
  5    v_f3 NUMBER := 3;
  6  BEGIN
  7    v_InsertStmt :=
  8      'INSERT INTO duplicates VALUES (:a, :b, :c, :a)';
  9
 10    EXECUTE IMMEDIATE v_InsertStmt
 11      USING v_f1, v_f2, v_f3, v_f1;
 12  END;
 13  /

PL/SQL procedure successfully completed.

SQL>
SQL> SELECT *
  2    FROM duplicates;

        F1         F2         F3         F4
---------- ---------- ---------- ----------
         1          2          3          1

1 row selected.

SQL>
SQL> DECLARE
  2    v_InsertStmt VARCHAR2(100);
  3    v_f1 NUMBER := 4;
  4    v_f2 NUMBER := 5;
  5    v_f3 NUMBER := 6;
  6  BEGIN
  7    v_InsertStmt :=
  8      'BEGIN ' ||
  9      '  INSERT INTO duplicates VALUES (:a, :b, :c, :a); ' ||
 10      'END;';
 11
 12    EXECUTE IMMEDIATE v_InsertStmt
 13      USING v_f1, v_f2, v_f3;
 14  END;
 15  /

PL/SQL procedure successfully completed.

SQL>
SQL> SELECT *
  2    FROM duplicates;

        F1         F2         F3         F4
---------- ---------- ---------- ----------
         1          2          3          1
         4          5          6          4

2 rows selected.

SQL>
SQL> DROP TABLE duplicates;

Table dropped.

SQL>
SQL>








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