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JavaExercises/Java 2/J2Lesson8/CRUD.java at master · biblelamp/JavaExercises · GitHub
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CRUD.java
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/**
* Java. Level 2. Lesson 8
* CRUD — Create, Read, Update, Delete
*
* @author Sergey Iryupin
* @version 0.2 dated Jan 19, 2018
*/
import
java
.
util
.*;
import
java
.
sql
.*;
class
CRUD
implements
IConstants
{
final
String
NAME_TABLE
=
"users"
;
final
String
SQL_CREATE_TABLE
=
"DROP TABLE IF EXISTS "
+
NAME_TABLE
+
";"
+
"CREATE TABLE "
+
NAME_TABLE
+
"(login CHAR(6) PRIMARY KEY NOT NULL,"
+
" passwd CHAR(6) NOT NULL);"
;
final
String
SQL_SELECT
=
"SELECT * FROM "
+
NAME_TABLE
+
";"
;
final
String
DB_CREATED
=
"Darabase created."
;
final
String
RECORD_ADDED
=
"Record added."
;
final
String
RECORD_DELETED
=
"Record deleted."
;
final
String
RECORD_UPDATED
=
"Record updated."
;
final
String
UNKNOWN_COMMAND
=
"Unknown command, use [-c,-a,-r,-u,-d] only."
;
final
String
LOGIN_COL
=
"login"
;
Connection
connect
;
Statement
stmt
;
ResultSet
rs
;
String
sql
;
public
static
void
main
(
String
[]
args
) {
new
CRUD
(
args
);
}
CRUD
(
String
[]
args
) {
if
(
args
.
length
==
0
) {
Scanner
sc
=
new
Scanner
(
System
.
in
);
System
.
out
.
print
(
"> "
);
String
line
=
sc
.
nextLine
();
args
=
line
.
split
(
" "
);
}
switch
(
args
[
0
]) {
case
"-c"
:
openDBFile
(
SQLITE_DB
)
.
createTable
(
SQL_CREATE_TABLE
);
System
.
out
.
println
(
DB_CREATED
);
break
;
case
"-a"
:
openDBFile
(
SQLITE_DB
)
.
add
(
args
[
1
],
args
[
2
]);
System
.
out
.
println
(
RECORD_ADDED
);
break
;
case
"-r"
:
openDBFile
(
SQLITE_DB
)
.
list
();
break
;
case
"-u"
:
openDBFile
(
SQLITE_DB
)
.
update
(
args
[
1
],
args
[
2
]);
System
.
out
.
println
(
RECORD_UPDATED
);
break
;
case
"-d"
:
openDBFile
(
SQLITE_DB
)
.
delete
(
args
[
1
]);
System
.
out
.
println
(
RECORD_DELETED
);
break
;
default
:
System
.
out
.
println
(
UNKNOWN_COMMAND
);
}
}
private
CRUD
openDBFile
(
String
dbName
) {
// open/create database
try
{
Class
.
forName
(
DRIVER_NAME
);
connect
=
DriverManager
.
getConnection
(
dbName
);
stmt
=
connect
.
createStatement
();
}
catch
(
Exception
e
) {
e
.
printStackTrace
();
}
return
this
;
}
private
void
createTable
(
String
sqlCreateTable
) {
// create table
try
{
stmt
.
executeUpdate
(
sqlCreateTable
);
}
catch
(
Exception
e
) {
e
.
printStackTrace
();
}
}
private
void
add
(
String
login
,
String
passwd
) {
// add record
try
{
stmt
.
executeUpdate
(
"INSERT INTO "
+
NAME_TABLE
+
" (login, passwd) "
+
"VALUES ('"
+
login
+
"', '"
+
passwd
+
"');"
);
}
catch
(
Exception
e
) {
e
.
printStackTrace
();
}
}
private
void
update
(
String
login
,
String
passwd
) {
// update passwd by login
try
{
stmt
.
executeUpdate
(
"UPDATE "
+
NAME_TABLE
+
" set PASSWD='"
+
passwd
+
"' where LOGIN='"
+
login
+
"';"
);
}
catch
(
Exception
e
) {
e
.
printStackTrace
();
}
}
private
void
delete
(
String
login
) {
// delete record by login
try
{
stmt
.
executeUpdate
(
"DELETE from "
+
NAME_TABLE
+
" where LOGIN='"
+
login
+
"';"
);
}
catch
(
Exception
e
) {
e
.
printStackTrace
();
}
}
private
void
list
() {
// show all records
try
{
System
.
out
.
println
(
"LOGIN
\t
\t
PASSWD"
);
rs
=
stmt
.
executeQuery
(
SQL_SELECT
);
while
(
rs
.
next
())
System
.
out
.
println
(
rs
.
getString
(
LOGIN_COL
) +
"
\t
\t
"
+
rs
.
getString
(
PASSWD_COL
));
}
catch
(
Exception
e
) {
e
.
printStackTrace
();
}
}
}
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