如何在oracle函数中列出表

在postresql函数中，我们可以在（SELECT…）中按i列出表

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在Oracle中，不必显式声明游标循环变量。它隐式地将是

表名%rowtype

数据类型

以下是一个例子：

For i in (select col_1, .., col_n
            from your_table)
loop
  -- do something
end loop;

演示：

create table test_1(col1 varchar2(11));

Table created

SQL> insert into test_1(col1) values('data_1');

1 row inserted

SQL> insert into test_1(col1) values('data_2');

1 row inserted

SQL> insert into test_1(col1) values('data_3');

1 row inserted

SQL> commit;

Commit complete

SQL> set serveroutput on;

SQL>begin
  2    for i in (select col1 from test_1)
  3    loop
  4      dbms_output.put_line(i.col1);
  5    end loop;
  6  end;
  7  /

data_1
data_2
data_3

PL/SQL procedure successfully completed

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我已经补充了一些细节

For i in (select col_1, .., col_n
            from your_table)
loop
  -- do something
end loop;

create table test_1(col1 varchar2(11));

Table created

SQL> insert into test_1(col1) values('data_1');

1 row inserted

SQL> insert into test_1(col1) values('data_2');

1 row inserted

SQL> insert into test_1(col1) values('data_3');

1 row inserted

SQL> commit;

Commit complete

SQL> set serveroutput on;

SQL>begin
  2    for i in (select col1 from test_1)
  3    loop
  4      dbms_output.put_line(i.col1);
  5    end loop;
  6  end;
  7  /

data_1
data_2
data_3

PL/SQL procedure successfully completed