oracle中print_table存储过程介绍

一直以来，觉得MySQL中使用\G参数改变输出结果集的显示方式非常好用，尤其是在命令行界面。但是ORACLE数据库没有这个功能，今天在搜索到Tom大师的一篇博文时，发现大师用一个存储过程print_table实现了类似这样的功能。只是我们这些凡夫俗子不知道而已，特意整理在此，方便自己或有需要的人以后查看。

CREATE OR REPLACE PROCEDURE print_table(p_query IN VARCHAR2) 

AUTHID  CURRENT_USER 

IS 

  l_thecursor   INTEGER DEFAULT dbms_sql.open_cursor; 

  l_columnvalue VARCHAR2(4000); 

  l_status      INTEGER; 

  l_desctbl     dbms_sql.desc_tab; 

  l_colcnt      NUMBER; 

BEGIN 

    EXECUTE IMMEDIATE 'alter session set  nls_date_format=''dd-mon-yyyy hh24:mi:ss'' '; 

    dbms_sql.parse(l_thecursor, p_query, dbms_sql.native); 

    dbms_sql.describe_columns (l_thecursor, l_colcnt, l_desctbl); 

    FOR i IN 1 .. l_colcnt LOOP 

        dbms_sql.define_column (l_thecursor, i, l_columnvalue, 4000); 

    END LOOP; 

    l_status := dbms_sql.EXECUTE(l_thecursor); 

    WHILE ( dbms_sql.Fetch_rows(l_thecursor) > 0 ) LOOP 

        FOR i IN 1 .. l_colcnt LOOP 

            dbms_sql.column_value (l_thecursor, i, l_columnvalue); 

            dbms_output.Put_line (RPAD(L_desctbl(i).col_name, 30) 

                                  || ': ' 

                                  || l_columnvalue); 

        END LOOP; 

        dbms_output.put_line('-----------------'); 

    END LOOP; 

    EXECUTE IMMEDIATE 'alter session set nls_date_format=''dd-MON-rr'' '; 

EXCEPTION 

  WHEN OTHERS THEN 

             EXECUTE IMMEDIATE 

             'alter session set nls_date_format=''dd-MON-rr'' '; 

             RAISE; 

END; 

/ 

如下测试所示：

SQL> set serveroutput on size 99999;

SQL> execute print_table('select * from v$session where sid=997');

SADDR                         : 000000085FA35CA0

SID                           : 997

SERIAL#                       : 1

AUDSID                        : 0

PADDR                         : 000000085F6B7E70

USER#                         : 0

USERNAME                      :

COMMAND                       : 0

OWNERID                       : 2147483644

TADDR                         :

LOCKWAIT                      :

STATUS                        : ACTIVE

SERVER                        : DEDICATED

SCHEMA#                       : 0

SCHEMANAME                    : SYS

OSUSER                        : oracle

PROCESS                       : 5036

MACHINE                       : xxxx

PORT                          : 0

TERMINAL                      : UNKNOWN

PROGRAM                       : oracle@xxxxx (DBW0)

TYPE                          : BACKGROUND

SQL_ADDRESS                   : 00

SQL_HASH_VALUE                : 0

SQL_ID                        :

SQL_CHILD_NUMBER              : 0

PREV_SQL_ADDR                 : 00

PREV_HASH_VALUE               : 0

PREV_SQL_ID                   :

PREV_CHILD_NUMBER             : 0

PLSQL_ENTRY_OBJECT_ID         :

PLSQL_ENTRY_SUBPROGRAM_ID     :

PLSQL_OBJECT_ID               :

PLSQL_SUBPROGRAM_ID           :

MODULE                        :

MODULE_HASH                   : 0

ACTION                        :

ACTION_HASH                   : 0

CLIENT_INFO                   :

FIXED_TABLE_SEQUENCE          : 0

ROW_WAIT_OBJ#                 : -1

ROW_WAIT_FILE#                : 0

ROW_WAIT_BLOCK#               : 0

ROW_WAIT_ROW#                 : 0

LOGON_TIME                    : 04-jul-2018 21:15:52

LAST_CALL_ET                  : 5272838

PDML_ENABLED                  : NO

FAILOVER_TYPE                 : NONE

FAILOVER_METHOD               : NONE

FAILED_OVER                   : NO

RESOURCE_CONSUMER_GROUP       :

PDML_STATUS                   : DISABLED

PDDL_STATUS                   : DISABLED

PQ_STATUS                     : DISABLED

CURRENT_QUEUE_DURATION        : 0

CLIENT_IDENTIFIER             :

BLOCKING_SESSION_STATUS       : NO HOLDER

BLOCKING_INSTANCE             :

BLOCKING_SESSION              :

SEQ#                          : 34697

EVENT#                        : 3

EVENT                         : rdbms ipc message

P1TEXT                        : timeout

P1                            : 300

P1RAW                         : 000000000000012C

P2TEXT                        :

P2                            : 0

P2RAW                         : 00

P3TEXT                        :

P3                            : 0

P3RAW                         : 00

WAIT_CLASS_ID                 : 2723168908

WAIT_CLASS#                   : 6

WAIT_CLASS                    : Idle

WAIT_TIME                     : 0

SECONDS_IN_WAIT               : 107

STATE                         : WAITING

SERVICE_NAME                  : SYS$BACKGROUND

SQL_TRACE                     : DISABLED

SQL_TRACE_WAITS               : FALSE

SQL_TRACE_BINDS               : FALSE

ECID                          :

-----------------

PL/SQL procedure successfully completed.

SQL> 

参考资料:

https://asktom.oracle.com/pls/asktom/f?p=100:11:::::P11_QUESTION_ID:1035431863958,%7Bprint_table%7D