SQLcl这个可爱的小工具,来了解一下呀~
2021/4/12 19:30:14
本文主要是介绍SQLcl这个可爱的小工具,来了解一下呀~,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
无论是Oracle的新手还是专家,几乎每天都在使用SQL*Plus,因为这个工具是Oracle Database原生的,无需额外安装就可使用,并且这是一个命令行工具,只要能访问到操作系统,无论是Linux,Windows还是其他系统,都可以方便地使用。但用了这么多年的SQL*Plus,对这个工具总是有点小困扰,比如在Linux当中不支持通过上下方向键进行历史命令的检索、如果SQL语句比较长,一旦在前几行有错误,只能重新输入无法修改,SQL*Plus也不提供代码补全等功能。
其实在2015年开始的教学过程中,我们已经使用了新一代的Oracle Database命令行工具,叫做SQLcl(Oracle SQL Developer Command Line),它不但提供了原来SQL*Plus的功能,还提供了强大的编辑功能,同时也提供代码补全、更美观的输出等功能。今天我们就和大家一起来了解一下这个可爱的小工具是如何使用的吧。
首先我们了解一下今天使用的实验环境:
操作系统:Linux x86-64
数据库:Oracle Database 19c(19.8)
1、SQLcl的安装
SQLcl是一个依赖Java运行环境的小工具,所以请确保您要运行SQLcl的操作系统无论是Windows还是Linux事先安装了Java环境并配置了相应的环境变量。
[oracle@henry ~]$ java -versionjava version "1.8.0_221"Java(TM) SE Runtime Environment (build 1.8.0_221-b11)Java HotSpot(TM) 64-Bit Server VM (build 25.221-b11, mixed mode)[oracle@henry ~]$
然后来到https://www.oracle.com/database/technologies/appdev/sqlcl.html下载SQLcl,点击下图中红色框指出的下载按钮即可下载,
无论您使用的是Windows操作系统还是Linux,都可以下载统一的安装包,和SQL Developer一样,在安装包当中包含exe文件和Linux系统使用的可执行脚本。
下载之后,解压压缩包,并且将SQLcl的路径放入环境变量PATH当中,比如在今天的实验中,我们将sqlcl解压到/opt/sqlcl下面,于是将/opt/sqlcl/bin放入PATH就可以。
[root@henry]# su - oracleLast login: Sat Oct 17 02:58:45 GMT 2020 on pts/1[oracle@henry ~]$ cat .bash_profile# .bash_profile # Get the aliases and functionsif [ -f ~/.bashrc ]; then . ~/.bashrcfi # User specific environment and startup programsexport ORACLE_HOME=/opt/oracle/product/19c/dbhome_1PATH=$PATH:$HOME/.local/bin:$HOME/bin:/opt/oracle/product/19c/dbhome_1/bin:/opt/sqlcl/binexport ORACLE_SID=ORCLCDBexport PATH[oracle@henry ~]$
2、使用SQLcl连接Oracle Database
使用SQLcl连接Oracle数据库和之前使用的SQL*Plus非常相似,甚至可以说没什么不同。只是之前使用的是sqlplus,现在只要写sql就可以了。
[oracle@henry ~]$ sql hr/hr@localhost:1521/orclpdb1SQLcl: Release 19.1 Production on Sat Oct 17 03:13:33 2020Copyright (c) 1982, 2020, Oracle. All rights reserved.Connected to:Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - ProductionVersion 19.8.0.0.0SQL>
然后我们可以使用help来查询一下都有哪些命令可以使用。
SQL>helpSQL> helpFor help on a topic type help <topic>List of Help topics available: /@@@ACCEPTALIAS*APEX*APPENDARCHIVE_LOGBREAKBRIDGE*BTITLECD*CHANGECLEARCOLUMNCOMPUTECONNECTCOPYCTAS*DDL*DEFINEDELDESCRIBEDISCONNECTEDITEXECUTEEXITFIND*FORMAT*GETHISTORY*HOSTINFORMATION*INPUTLIQUIBASE*LISTLOAD*NET*OERR*PASSWORDPAUSEPRINTPROMPTQUITREMARKREPEAT*RESERVED_WORDSREST*RUNSAVESCRIPT*SETSETERRORLSHOWSHUTDOWNSODA*SPOOLSSHTUNNEL*STARTSTARTUPSTORETIMINGTNSPING*TTITLEUNDEFINEVARIABLEVAULT*WHENEVERWHICH*XQUERYSQL>
3、NET命令
以前我们在SQL*Plus当中连接特定数据库使用的是tnsnames.ora当中的命名,在SQLcl当中,可以通过NET命令非常方便地随时创建数据库连接别名。需要注意的是NET功能默认被关闭了,要在SQLcl当中通过set net on将它打开。
在下面的例子当中,我们创建一个连接别名叫做ora,去连接本地的orclpdb1数据库,监听端口1521。
SQL> show netnet: ONSQL> set net offSQL> show netnet: OFFSQL> set net onSQL> net ora=localhost:1521/orclpdb1; SQL> conn hr/hr@oraConnected.SQL>
4、使用Tab键进行代码补齐
在输入语句的时候,可以通过按Tab键来补全语句关键字(比如select)、table的名字,column的名字等,当有些table当中的column name非常长的时候,这项功能就极为高效。
大家通过观察下面的视频,当我按Tab键的时候,自动补全的部分会使用大写来显示。
5、多行编辑功能
我们在写比较长的SQL语句的时候,为了保持美观及增强可读性,我们经常使用换行,但是大家在使用SQL*Plus的时候,如果有一行写错了,就得重新将整个语句都重写,非常不方便。我们之前使用的技术是将SQL语句写在一个文件当中,然后来执行这个文件。但总觉得不是很方便。在SQLcl当中,通过按方向键左键来移动光标进行修改,请不要按方向键上下键,因为上下键是用来查找我们之前执行的语句历史的。
6、使用HISTORY命令查看执行历史
我们在Linux当中使用SQL*Plus的时候,总是羡慕在Windows环境的cmd当中执行SQL*Plus,可以使用方向键上下键来查找之前执行过的语句。在SQLcl当中,无论是在Linux还是Windows环境下,都支持使用方向键上下键对之前执行过的语句进行滚动查找并执行。此外,可以使用SQLcl的history命令来查看之前执行过的语句和命令。history命令有如下几个参数:full、usage(执行次数)、time(执行时间),clear(清除历史)以及使用具体的语句序号。大家可以观察一下直接使用history和history full的区别。
7、使用CD命令直接在SQLcl当中更换目录
我们在执行本地脚本的时候,如果启动SQL*Plus的时候,不是在脚本所在的路径,我们经常要使用全路径名来执行脚本,而在SQLcl当中可以像在命令行中一样,使用cd命令进行路径的切换。
比如,我们现在/opt路径下启动SQLcl,在/opt/henry路径下有一个h.sql脚本要执行。我们在SQLcl当中可以直接使用cd命令进行路径切换。
8、使用ALIAS命令创建语句或者程序块的快捷方式
在测试程序或者调试数据库的时候,我们经常要反复执行一段代码,比如查看当前数据文件大小。之前我们的做法是将这些语句写成一个SQL脚本,然后每次来执行,或者写在一个记事本当中进行复制粘贴。在SQLcl当中,可以将这些语句临时定义成一个ALIAS,使用起来更加轻松方便。比如,我们在下面的例子当中,将一个SQL语句定义成一个ALIAS叫做tbs,来查询user_tables当中的记录数量。我们也可以通过alias list来查询当前已经定义好的ALIAS,大家通过观察发现,系统中已经为大家预定义了一些ALIAS。
9、使用SQLFORMAT设定输出格式
这是一项非常有用的功能,之前我们想将数据表中的数据,以JSON或者CSV的格式输出,一般要使用编程语言,比如Python。而在SQLcl当中,只要通过SQLFORMAT设定一下输出格式就可以了,不再依赖编程语言就可以方便输出JSON或者CSV格式的结果。SQLFORMAT还提供更多有趣的功能,大家可以查询官方文档挖掘更多的应用场景。
在set sqlformat当中可以使用如下设定,下面的例子中使用的是csv
default
ansiconsole
csv
insert – lists resuts as an insert statement
loader – pipe-delimited
delimited – same as csv
xml
html
fixed – fixed width
text
json
10、使用INFORMATION获取更多资讯
在SQL*Plus当中,我们经常使用describe命令来获取table的信息,在SQLcl当中,我们可以使用information或者info来获取更多的讯息。可以显示基本的column信息、index信息以及主外键讯息。
INFORMATION不只可以获得table的信息,也可以用来获取程序包的信息。
11、使用DDL命令获取数据对象ddl信息
有时候我们想获取一个表或者其他数据对象的DDL信息,以前我们都是使用程序包来实现,调用起来相对比较麻烦,在SQLcl当中我们可以使用DDL命令方便地获取这些数据对象的DDL信息。
SQL> ddl employees CREATE TABLE "HR"."EMPLOYEES" ( "EMPLOYEE_ID" NUMBER(6,0), "FIRST_NAME" VARCHAR2(20), "LAST_NAME" VARCHAR2(25) CONSTRAINT "EMP_LAST_NAME_NN" NOT NULL ENABLE, "EMAIL" VARCHAR2(25) CONSTRAINT "EMP_EMAIL_NN" NOT NULL ENABLE, "PHONE_NUMBER" VARCHAR2(20), "HIRE_DATE" DATE CONSTRAINT "EMP_HIRE_DATE_NN" NOT NULL ENABLE, "JOB_ID" VARCHAR2(10) CONSTRAINT "EMP_JOB_NN" NOT NULL ENABLE, "SALARY" NUMBER(8,2), "COMMISSION_PCT" NUMBER(2,2), "MANAGER_ID" NUMBER(6,0), "DEPARTMENT_ID" NUMBER(4,0), CONSTRAINT "EMP_SALARY_MIN" CHECK (salary > 0) ENABLE, CONSTRAINT "EMP_EMAIL_UK" UNIQUE ("EMAIL") USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "USERS" ENABLE, CONSTRAINT "EMP_DEPT_FK" FOREIGN KEY ("DEPARTMENT_ID") REFERENCES "HR"."DEPARTMENTS" ("DEPARTMENT_ID") ENABLE, CONSTRAINT "EMP_JOB_FK" FOREIGN KEY ("JOB_ID") REFERENCES "HR"."JOBS" ("JOB_ID") ENABLE, CONSTRAINT "EMP_MANAGER_FK" FOREIGN KEY ("MANAGER_ID") REFERENCES "HR"."EMPLOYEES" ("EMPLOYEE_ID") ENABLE ) SEGMENT CREATION IMMEDIATE PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "USERS" ; CREATE UNIQUE INDEX "HR"."EMP_EMP_ID_PK" ON "HR"."EMPLOYEES" ("EMPLOYEE_ID") PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "USERS" ;ALTER TABLE "HR"."EMPLOYEES" ADD CONSTRAINT "EMP_EMP_ID_PK" PRIMARY KEY ("EMPLOYEE_ID") USING INDEX "HR"."EMP_EMP_ID_PK" ENABLE; COMMENT ON COLUMN "HR"."EMPLOYEES"."EMPLOYEE_ID" IS 'Primary key of employees table.'; COMMENT ON COLUMN "HR"."EMPLOYEES"."FIRST_NAME" IS 'First name of the employee. A not null column.'; COMMENT ON COLUMN "HR"."EMPLOYEES"."LAST_NAME" IS 'Last name of the employee. A not null column.'; COMMENT ON COLUMN "HR"."EMPLOYEES"."EMAIL" IS 'Email id of the employee'; COMMENT ON COLUMN "HR"."EMPLOYEES"."PHONE_NUMBER" IS 'Phone number of the employee; includes country code and area code'; COMMENT ON COLUMN "HR"."EMPLOYEES"."HIRE_DATE" IS 'Date when the employee started on this job. A not null column.'; COMMENT ON COLUMN "HR"."EMPLOYEES"."JOB_ID" IS 'Current job of the employee; foreign key to job_id column of thejobs table. A not null column.'; COMMENT ON COLUMN "HR"."EMPLOYEES"."SALARY" IS 'Monthly salary of the employee. Must be greaterthan zero (enforced by constraint emp_salary_min)'; COMMENT ON COLUMN "HR"."EMPLOYEES"."COMMISSION_PCT" IS 'Commission percentage of the employee; Only employees in salesdepartment elgible for commission percentage'; COMMENT ON COLUMN "HR"."EMPLOYEES"."MANAGER_ID" IS 'Manager id of the employee; has same domain as manager_id indepartments table. Foreign key to employee_id column of employees table.(useful for reflexive joins and CONNECT BY query)'; COMMENT ON COLUMN "HR"."EMPLOYEES"."DEPARTMENT_ID" IS 'Department id where employee works; foreign key to department_idcolumn of the departments table'; COMMENT ON TABLE "HR"."EMPLOYEES" IS 'employees table. Contains 107 rows. References with departments,jobs, job_history tables. Contains a self reference.'; CREATE INDEX "HR"."EMP_DEPARTMENT_IX" ON "HR"."EMPLOYEES" ("DEPARTMENT_ID") PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "USERS" ; CREATE INDEX "HR"."EMP_JOB_IX" ON "HR"."EMPLOYEES" ("JOB_ID") PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "USERS" ; CREATE INDEX "HR"."EMP_MANAGER_IX" ON "HR"."EMPLOYEES" ("MANAGER_ID") PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "USERS" ; CREATE INDEX "HR"."EMP_NAME_IX" ON "HR"."EMPLOYEES" ("LAST_NAME", "FIRST_NAME") PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "USERS" ; CREATE OR REPLACE EDITIONABLE TRIGGER "HR"."SECURE_EMPLOYEES" BEFORE INSERT OR UPDATE OR DELETE ON employeesBEGIN secure_dml;END secure_employees; /ALTER TRIGGER "HR"."SECURE_EMPLOYEES" DISABLE; CREATE OR REPLACE EDITIONABLE TRIGGER "HR"."UPDATE_JOB_HISTORY" AFTER UPDATE OF job_id, department_id ON employees FOR EACH ROWBEGIN add_job_history(:old.employee_id, :old.hire_date, sysdate, :old.job_id, :old.department_id);END; /ALTER TRIGGER "HR"."UPDATE_JOB_HISTORY" ENABLE;SQL>
我们也可以将生成的DDL信息保存到文件当中,如下所示:
SQL> ddl employees save emp.sqlSQL> !cat emp.sql CREATE TABLE "HR"."EMPLOYEES" ( "EMPLOYEE_ID" NUMBER(6,0), "FIRST_NAME" VARCHAR2(20), "LAST_NAME" VARCHAR2(25) CONSTRAINT "EMP_LAST_NAME_NN" NOT NULL ENABLE, "EMAIL" VARCHAR2(25) CONSTRAINT "EMP_EMAIL_NN" NOT NULL ENABLE, "PHONE_NUMBER" VARCHAR2(20), "HIRE_DATE" DATE CONSTRAINT "EMP_HIRE_DATE_NN" NOT NULL ENABLE, "JOB_ID" VARCHAR2(10) CONSTRAINT "EMP_JOB_NN" NOT NULL ENABLE, "SALARY" NUMBER(8,2), "COMMISSION_PCT" NUMBER(2,2), "MANAGER_ID" NUMBER(6,0), "DEPARTMENT_ID" NUMBER(4,0), CONSTRAINT "EMP_SALARY_MIN" CHECK (salary > 0) ENABLE, CONSTRAINT "EMP_EMAIL_UK" UNIQUE ("EMAIL") USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "USERS" ENABLE, CONSTRAINT "EMP_DEPT_FK" FOREIGN KEY ("DEPARTMENT_ID") REFERENCES "HR"."DEPARTMENTS" ("DEPARTMENT_ID") ENABLE, CONSTRAINT "EMP_JOB_FK" FOREIGN KEY ("JOB_ID") REFERENCES "HR"."JOBS" ("JOB_ID") ENABLE, CONSTRAINT "EMP_MANAGER_FK" FOREIGN KEY ("MANAGER_ID") REFERENCES "HR"."EMPLOYEES" ("EMPLOYEE_ID") ENABLE ) SEGMENT CREATION IMMEDIATE PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "USERS" ; CREATE UNIQUE INDEX "HR"."EMP_EMP_ID_PK" ON "HR"."EMPLOYEES" ("EMPLOYEE_ID") PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "USERS" ;ALTER TABLE "HR"."EMPLOYEES" ADD CONSTRAINT "EMP_EMP_ID_PK" PRIMARY KEY ("EMPLOYEE_ID") USING INDEX "HR"."EMP_EMP_ID_PK" ENABLE; COMMENT ON COLUMN "HR"."EMPLOYEES"."EMPLOYEE_ID" IS 'Primary key of employees table.'; COMMENT ON COLUMN "HR"."EMPLOYEES"."FIRST_NAME" IS 'First name of the employee. A not null column.'; COMMENT ON COLUMN "HR"."EMPLOYEES"."LAST_NAME" IS 'Last name of the employee. A not null column.'; COMMENT ON COLUMN "HR"."EMPLOYEES"."EMAIL" IS 'Email id of the employee'; COMMENT ON COLUMN "HR"."EMPLOYEES"."PHONE_NUMBER" IS 'Phone number of the employee; includes country code and area code'; COMMENT ON COLUMN "HR"."EMPLOYEES"."HIRE_DATE" IS 'Date when the employee started on this job. A not null column.'; COMMENT ON COLUMN "HR"."EMPLOYEES"."JOB_ID" IS 'Current job of the employee; foreign key to job_id column of thejobs table. A not null column.'; COMMENT ON COLUMN "HR"."EMPLOYEES"."SALARY" IS 'Monthly salary of the employee. Must be greaterthan zero (enforced by constraint emp_salary_min)'; COMMENT ON COLUMN "HR"."EMPLOYEES"."COMMISSION_PCT" IS 'Commission percentage of the employee; Only employees in salesdepartment elgible for commission percentage'; COMMENT ON COLUMN "HR"."EMPLOYEES"."MANAGER_ID" IS 'Manager id of the employee; has same domain as manager_id indepartments table. Foreign key to employee_id column of employees table.(useful for reflexive joins and CONNECT BY query)'; COMMENT ON COLUMN "HR"."EMPLOYEES"."DEPARTMENT_ID" IS 'Department id where employee works; foreign key to department_idcolumn of the departments table'; COMMENT ON TABLE "HR"."EMPLOYEES" IS 'employees table. Contains 107 rows. References with departments,jobs, job_history tables. Contains a self reference.'; CREATE INDEX "HR"."EMP_DEPARTMENT_IX" ON "HR"."EMPLOYEES" ("DEPARTMENT_ID") PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "USERS" ; CREATE INDEX "HR"."EMP_JOB_IX" ON "HR"."EMPLOYEES" ("JOB_ID") PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "USERS" ; CREATE INDEX "HR"."EMP_MANAGER_IX" ON "HR"."EMPLOYEES" ("MANAGER_ID") PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "USERS" ; CREATE INDEX "HR"."EMP_NAME_IX" ON "HR"."EMPLOYEES" ("LAST_NAME", "FIRST_NAME") PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "USERS" ; CREATE OR REPLACE EDITIONABLE TRIGGER "HR"."SECURE_EMPLOYEES" BEFORE INSERT OR UPDATE OR DELETE ON employeesBEGIN secure_dml;END secure_employees; /ALTER TRIGGER "HR"."SECURE_EMPLOYEES" DISABLE; CREATE OR REPLACE EDITIONABLE TRIGGER "HR"."UPDATE_JOB_HISTORY" AFTER UPDATE OF job_id, department_id ON employees FOR EACH ROWBEGIN add_job_history(:old.employee_id, :old.hire_date, sysdate, :old.job_id, :old.department_id);END; /ALTER TRIGGER "HR"."UPDATE_JOB_HISTORY" ENABLE;
12、使用LOAD载入数据
如果大家有一个csv文件,想将里面的数据加载到table当中,要使用sql loader,但有些同学对写sql loader的control file感到比较头疼,在SQLcl当中,只需要简单的一个LOAD命令就可以。在下面的例子中,我们有一个csv文件叫做dt1.csv,我们想将这个文件中的数据载入到dt1这个table当中。需要注意的是,我们在创建csv文件的时候,第一行是使用大写字母定义的column names。
SQL> info dt1TABLE: DT1 LAST ANALYZED: ROWS : SAMPLE SIZE : INMEMORY :DISABLED COMMENTS : ColumnsNAME DATA TYPE NULL DEFAULT COMMENTS NAME VARCHAR2(20 BYTE) Yes AGE NUMBER Yes SQL> !cat dt1.csvNAME,AGEBob,25Jerry,26 SQL> load dt1 dt1.csv--Number of rows processed: 2--Number of rows in error: 00 - SUCCESS: Load processed without errorsSQL> select * from dt1; NAME AGE-------------------- ----------Bob 25Jerry 26
13、使用FORMAT对buffer中的SQL语句进行格式化
我们有时候从外面复制过来好长一段代码到SQL*Plus当中执行,或者我们自己敲了好长一段代码,这些代码可读性也许会很差,在SQLcl当中可以使用format buffer对buffer中的SQL语句进行格式化,提升可读性。
SQL> select dept.department_name, emp.first_name||' '||emp.last_name as empname 2 from employees emp 3 join departments dept 4 on emp.department_id = dept.department_id and dept.department_id=10 5 order by 1,2; DEPARTMENT_NAME EMPNAME------------------------------ ----------------------------------------------Administration Jennifer Whalen SQL> format buffer 1 SELECT 2 dept.department_name, 3 emp.first_name 4 || ' ' 5 || emp.last_name AS empname 6 FROM 7 employees emp 8 JOIN departments dept ON emp.department_id = dept.department_id 9 AND dept.department_id = 10 10 ORDER BY 11 1, 12* 2;
14、使用bridge创建“Database Link”
Database Link是什么,相信大家都了解,需要在Database当中创建之后才能使用。而SQLcl提供bridge功能,其实就是在SQLcl当中使用jdbc创建一个在SQLcl当中使用的数据库连接,使用起来非常方便。
SQL> bridge emp_tb as "jdbc:oracle:thin:hr/hr@localhost:1521/orclpdb1"(select first_name,last_name from employees);Created table emp_tb and inserted 107 row(s)SQL> select count(*) from emp_tb; COUNT(*)---------- 107
SQLcl还有好多有趣的功能,大家可以点击“阅读原文”参考官方文档,获取更多资讯。
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