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>