makeyourowndatabase

A toy database implemented in java!

Run this project

Run this project in IDEA:

run Main class

Run this project in terminal:

git clone https://github.com/Chang-LeHung/makeyourowndatabase.git
cd makeyourowndatabase
mvn package
java -jar target/makeyourdatabase-1.0-SNAPSHOT-jar-with-dependencies.jar

Results are like following images:

>>>select * from student;
executing: select * from student;
+-----------------------+-------------+
|         name          |     id      |
+-----------------------+-------------+
| StringData{param='A'} | Int{val=1}  |
| StringData{param='A'} | Int{val=2}  |
| StringData{param='A'} | Int{val=3}  |
| StringData{param='A'} | Int{val=4}  |
| StringData{param='A'} | Int{val=5}  |
| StringData{param='B'} | Int{val=6}  |
| StringData{param='B'} | Int{val=7}  |
| StringData{param='B'} | Int{val=8}  |
| StringData{param='B'} | Int{val=9}  |
| StringData{param='C'} | Int{val=10} |
| StringData{param='C'} | Int{val=11} |
| StringData{param='C'} | Int{val=12} |
| StringData{param='D'} | Int{val=13} |
| StringData{param='D'} | Int{val=14} |
+-----------------------+-------------+
Size of queried table : 14
>>>delete from student where name=='A';
executing: delete from student where name=='A';
Delete OK;
>>>select * from student;
executing: select * from student;
+-----------------------+-------------+
|         name          |     id      |
+-----------------------+-------------+
| StringData{param='B'} | Int{val=6}  |
| StringData{param='B'} | Int{val=7}  |
| StringData{param='B'} | Int{val=8}  |
| StringData{param='B'} | Int{val=9}  |
| StringData{param='C'} | Int{val=10} |
| StringData{param='C'} | Int{val=11} |
| StringData{param='C'} | Int{val=12} |
| StringData{param='D'} | Int{val=13} |
| StringData{param='D'} | Int{val=14} |
+-----------------------+-------------+
Size of queried table : 9
>>>

>>> select name, avg(id), max(id), min(id), count(name) from stu group by name having avg(id) > 6;
executing: select name, avg(id), max(id), min(id), count(name) from stu group by name having avg(id) > 6;
+-------------+-------------+-------------------------+-------------+-----------------+
| count(name) |   max(id)   |          name           |   min(id)   |     avg(id)     |
+-------------+-------------+-------------------------+-------------+-----------------+
| Int{val=3}  | Int{val=14} | StringData{param='tyx'} | Int{val=12} | Float{val=13.0} |
| Int{val=1}  | Int{val=7}  |  StringData{param='B'}  | Int{val=7}  | Float{val=7.0}  |
| Int{val=1}  | Int{val=8}  |  StringData{param='C'}  | Int{val=8}  | Float{val=8.0}  |
| Int{val=1}  | Int{val=9}  |  StringData{param='D'}  | Int{val=9}  | Float{val=9.0}  |
| Int{val=1}  | Int{val=10} |  StringData{param='E'}  | Int{val=10} | Float{val=10.0} |
| Int{val=1}  | Int{val=11} |  StringData{param='F'}  | Int{val=11} | Float{val=11.0} |
+-------------+-------------+-------------------------+-------------+-----------------+
Size of queried table : 6
>>>

>>>select count(name) from stu;
executing: select count(name) from stu;
+-------------+
| count(name) |
+-------------+
| Int{val=14} |
+-------------+
Size of queried table : 1
>>>

select * from stu where name like "%harden%";
executing: select * from stu where name like "%harden%";
+----------------------------------+-------------+
|               name               |     id      |
+----------------------------------+-------------+
| StringData{param='james_harden'} | Int{val=21} |
| StringData{param='james_harden'} | Int{val=19} |
| StringData{param='james_harden'} | Int{val=18} |
+----------------------------------+-------------+
Size of queried table : 3
>>>select * from stu;
executing: select * from stu;
+------------------------------------+-------------+
|                name                |     id      |
+------------------------------------+-------------+
|    StringData{param='huchang'}     | Int{val=1}  |
|    StringData{param='huchang'}     | Int{val=2}  |
|    StringData{param='huchang'}     | Int{val=3}  |
|    StringData{param='huchang'}     | Int{val=4}  |
|     StringData{param='asdsad'}     | Int{val=5}  |
|       StringData{param='A'}        | Int{val=6}  |
|       StringData{param='B'}        | Int{val=7}  |
|       StringData{param='C'}        | Int{val=8}  |
|       StringData{param='D'}        | Int{val=9}  |
|       StringData{param='E'}        | Int{val=10} |
|       StringData{param='F'}        | Int{val=11} |
|      StringData{param='tyx'}       | Int{val=12} |
|      StringData{param='tyx'}       | Int{val=13} |
|      StringData{param='tyx'}       | Int{val=14} |
| StringData{param='"lebron_james"'} | Int{val=15} |
|  StringData{param='lebron_james'}  | Int{val=16} |
|  StringData{param='lebron_james'}  | Int{val=17} |
|  StringData{param='james_harden'}  | Int{val=21} |
| StringData{param='"lebron_james"'} | Int{val=20} |
|  StringData{param='james_harden'}  | Int{val=19} |
|  StringData{param='james_harden'}  | Int{val=18} |
+------------------------------------+-------------+
Size of queried table : 21
>>>

select * from stu;
executing: select * from stu;
+------------------------------------+-------------+
|                name                |     id      |
+------------------------------------+-------------+
|    StringData{param='huchang'}     | Int{val=1}  |
|    StringData{param='huchang'}     | Int{val=2}  |
|    StringData{param='huchang'}     | Int{val=3}  |
|    StringData{param='huchang'}     | Int{val=4}  |
|     StringData{param='asdsad'}     | Int{val=5}  |
|       StringData{param='A'}        | Int{val=6}  |
|       StringData{param='B'}        | Int{val=7}  |
|       StringData{param='C'}        | Int{val=8}  |
|       StringData{param='D'}        | Int{val=9}  |
|       StringData{param='E'}        | Int{val=10} |
|       StringData{param='F'}        | Int{val=11} |
|      StringData{param='tyx'}       | Int{val=12} |
|      StringData{param='tyx'}       | Int{val=13} |
|      StringData{param='tyx'}       | Int{val=14} |
| StringData{param='"lebron_james"'} | Int{val=15} |
|  StringData{param='lebron_james'}  | Int{val=16} |
|  StringData{param='lebron_james'}  | Int{val=17} |
|  StringData{param='james_harden'}  | Int{val=21} |
| StringData{param='"lebron_james"'} | Int{val=20} |
|  StringData{param='james_harden'}  | Int{val=19} |
|  StringData{param='james_harden'}  | Int{val=18} |
+------------------------------------+-------------+
Size of queried table : 21
>>>update stu set name=new where name == "tyx";
executing: update stu set name=new where name == "tyx";
Update OK;
>>>select * from stu;
executing: select * from stu;
+------------------------------------+-------------+
|                name                |     id      |
+------------------------------------+-------------+
|    StringData{param='huchang'}     | Int{val=1}  |
|    StringData{param='huchang'}     | Int{val=2}  |
|    StringData{param='huchang'}     | Int{val=3}  |
|    StringData{param='huchang'}     | Int{val=4}  |
|     StringData{param='asdsad'}     | Int{val=5}  |
|       StringData{param='A'}        | Int{val=6}  |
|       StringData{param='B'}        | Int{val=7}  |
|       StringData{param='C'}        | Int{val=8}  |
|       StringData{param='D'}        | Int{val=9}  |
|       StringData{param='E'}        | Int{val=10} |
|       StringData{param='F'}        | Int{val=11} |
|      StringData{param='new'}       | Int{val=12} |
|      StringData{param='new'}       | Int{val=13} |
|      StringData{param='new'}       | Int{val=14} |
| StringData{param='"lebron_james"'} | Int{val=15} |
|  StringData{param='lebron_james'}  | Int{val=16} |
|  StringData{param='lebron_james'}  | Int{val=17} |
|  StringData{param='james_harden'}  | Int{val=21} |
| StringData{param='"lebron_james"'} | Int{val=20} |
|  StringData{param='james_harden'}  | Int{val=19} |
|  StringData{param='james_harden'}  | Int{val=18} |
+------------------------------------+-------------+
Size of queried table : 21
>>>

Name		Name	Last commit message	Last commit date
Latest commit History 39 Commits
imgs		imgs
src		src
.gitignore		.gitignore
README.md		README.md
pom.xml		pom.xml

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Repository files navigation

makeyourowndatabase

Run this project

Run this project in IDEA:

Run this project in terminal:

About

Releases

Packages

Languages

Chang-LeHung/makeyourowndatabase

Folders and files

Latest commit

History

Repository files navigation

makeyourowndatabase

Run this project

Run this project in IDEA:

Run this project in terminal:

About

Resources

Stars

Watchers

Forks

Releases

Packages 0

Languages

Packages