0. 命令行 登錄/退出
登錄
java org.apache.derby.tools.ij
..\dirs>java org.apache.derby.tools.ij
ij 版本 10.3
ij>
退出
ij> exit;
1. 創建新數據庫
connect 'jdbc:derby:mydb;create=true';
ij> connect 'jdbc:derby:mydb;create=true';
ij>
在當前目錄下建立數據庫目錄 mydb;
<DIR>log
<DIR>seg0
<DIR>tmp
service.properties
b.lck
如果已經尋在數據庫 mydb,則提示：
警告 01J01：未創建數據庫"mydb"，而是建立到現有數據庫的連接。
ij> connect 'jdbc:derby:mydb;create=true';
警告 01J01：未創建數據庫"mydb"，而是建立到現有數據庫的連接。
ij>
2. 創建新表/刪除表
create table mytable(number varchar(4), name varchar(10), age int, address varchar(40));
ij> create table mytable(number varchar(4), name varchar(10), age int, address varchar(40));
已插入／更新／刪除 0 行
ij>
//刪除整個表
drop table mytable;
ij> drop table mytable;
已插入／更新／刪除 0 行
ij>
3. 表中添加數據：
insert into mytable values('1001', 'one', 20, 'street 1');
insert into mytable values('1002', 'two', 22, 'street 2');
ij> insert into mytable values('1001', 'one', 20, 'street 1');
已插入／更新／刪除 1 行
ij> insert into mytable values('1002', 'two', 22, 'street 2');
已插入／更新／刪除 1 行
ij> select * from mytable;
NUM&|NAME |AGE |ADDRESS
--------------------------------------------------------------------
1001|one |20 |street 1
1002|two |22 |street 2
已選擇 2 行
4. 查看表
show tables;
ij> show tables;
TABLE_SCHEM |TABLE_NAME |REMARKS
------------------------------------------------------------------------
SYS |SYSALIASES |
SYS |SYSCHECKS |
SYS |SYSCOLPERMS |
SYS |SYSCOLUMNS |
SYS |SYSCONGLOMERATES |
SYS |SYSCONSTRAINTS |
SYS |SYSDEPENDS |
SYS |SYSFILES |
SYS |SYSFOREIGNKEYS |
SYS |SYSKEYS |
SYS |SYSROUTINEPERMS |
SYS |SYSSCHEMAS |
SYS |SYSSTATEMENTS |
SYS |SYSSTATISTICS |
SYS |SYSTABLEPERMS |
SYS |SYSTABLES |
SYS |SYSTRIGGERS |
SYS |SYSVIEWS |
SYSIBM |SYSDUMMY1 |
APP |MYTABLE |
最后一個是我們自己創建的表 MYTABLE
5. 查看表的結構
describe mytable;
ij> describe mytable;
COLUMN_NAME |TYPE_NAME|DEC&|NUM&|COLUM&|COLUMN_DEF|CHAR_OCTE&|IS_NULL&
------------------------------------------------------------------------------
NUMBER |VARCHAR |NULL|NULL|4 |NULL |8 |YES
NAME |VARCHAR |NULL|NULL|10 |NULL |20 |YES
AGE |INTEGER |0 |10 |10 |NULL |NULL |YES
ADDRESS |VARCHAR |NULL|NULL|40 |NULL |80 |YES
已選擇 4 行
ij>
6. 表中添加數據
insert into mytable values('1001', 'one', 20, 'street 1');
insert into mytable values('1002', 'two', 22, 'street 2');
ij> insert into mytable values('1001', 'one', 20, 'street 1');
已插入／更新／刪除 1 行
ij> insert into mytable values('1002', 'two', 22, 'street 2');
已插入／更新／刪除 1 行
ij>
7. 查詢數據
select * from mytable;
select number, name from mytable;
ij> select * from mytable;
NUM&|NAME |AGE |ADDRESS
--------------------------------------------------------------------
1001|one |20 |street 1
1002|two |22 |street 2
已選擇 2 行
ij> select number, name from mytable;
NUM&|NAME
---------------
1001|one
1002|two
已選擇 2 行
8. 更新數據
update mytable set where number = '1001';
ij> update mytable set where number = '1001';
已插入／更新／刪除 1 行
ij> select * from mytable;
NUM&|NAME |AGE |ADDRESS
--------------------------------------------------------------------
1001|one_one |20 |street 1
1002|two |22 |street 2
已選擇 2 行
ij>
9. 刪除表中數據，保留表格式
delete from mytable where ;
delete from mytable;
ij> delete from mytable where ;
已插入／更新／刪除 1 行
ij> select * from mytable;
NUM&|NAME |AGE |ADDRESS
--------------------------------------------------------------------
1001|one_one |20 |street 1
已選擇 1 行
ij> delete from mytable;
已插入／更新／刪除 1 行
ij> select * from mytable;
NUM&|NAME |AGE |ADDRESS
--------------------------------------------------------------------
已選擇 0 行
ij> describe mytable;
COLUMN_NAME |TYPE_NAME|DEC&|NUM&|COLUM&|COLUMN_DEF|CHAR_OCTE&|IS_NULL&
------------------------------------------------------------------------------
NUMBER |VARCHAR |NULL|NULL|4 |NULL |8 |YES
NAME |VARCHAR |NULL|NULL|10 |NULL |20 |YES
AGE |INTEGER |0 |10 |10 |NULL |NULL |YES
ADDRESS |VARCHAR |NULL|NULL|40 |NULL |80 |YES
已選擇 4 行
ij>