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JavaExercises/Java 2/SQLite.java at master · biblelamp/JavaExercises · GitHub
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/**
* Java. Level 2. Lesson 7. Homework
* Simple operations with SQLite database
* Note:
* a) Download latest ver of sqlite-jdbc-(VER).jar from https://bitbucket.org/xerial/sqlite-jdbc/downloads
* b) Put this jar into \jre\lib\ext
* c) See also http://www.tutorialspoint.com/sqlite/sqlite_java.htm
*
* @author Sergey Iryupin
* @version 29 July 2016
*/
import
java
.
sql
.*;
public
class
SQLite
{
static
final
String
DRIVER_NAME
=
"org.sqlite.JDBC"
;
static
Connection
connect
=
null
;
static
String
nameDB
=
"sqlite.db"
;
static
String
tableDB
=
"COMPANY"
;
public
static
void
main
(
String
[]
args
) {
openDB
(
nameDB
);
createTable
(
tableDB
);
insertRecords
(
tableDB
);
selectRecords
(
tableDB
);
updateRecord
(
tableDB
);
selectRecords
(
tableDB
);
deleteRecord
(
tableDB
);
selectRecords
(
tableDB
);
try
{
connect
.
close
();
}
catch
(
Exception
e
) {
e
.
printStackTrace
();
System
.
exit
(-
1
);
}
}
static
void
openDB
(
String
nameDB
) {
try
{
Class
.
forName
(
DRIVER_NAME
);
connect
=
DriverManager
.
getConnection
(
"jdbc:sqlite:"
+
nameDB
);
}
catch
(
Exception
e
) {
e
.
printStackTrace
();
System
.
exit
(-
1
);
}
System
.
out
.
println
(
"Opening database "
+
nameDB
+
" successfully"
);
}
static
void
createTable
(
String
table
) {
try
{
Statement
stmt
=
connect
.
createStatement
();
String
sql
=
"CREATE TABLE "
+
table
+
"(ID INT PRIMARY KEY NOT NULL,"
+
" NAME TEXT NOT NULL,"
+
" AGE INT NOT NULL,"
+
" ADDRESS CHAR(50),"
+
" SALARY REAL)"
;
stmt
.
executeUpdate
(
sql
);
stmt
.
close
();
}
catch
(
Exception
e
) {
e
.
printStackTrace
();
System
.
exit
(-
1
);
}
System
.
out
.
println
(
"Create table in database "
+
nameDB
+
" successfully"
);
}
static
void
insertRecords
(
String
table
) {
try
{
Statement
stmt
=
connect
.
createStatement
();
String
sql
=
"INSERT INTO "
+
table
+
" (ID,NAME,AGE,ADDRESS,SALARY) "
+
"VALUES (1, 'Paul', 32, 'California', 20000.00);"
;
stmt
.
executeUpdate
(
sql
);
sql
=
"INSERT INTO "
+
table
+
" (ID,NAME,AGE,ADDRESS,SALARY) "
+
"VALUES (2, 'Allen', 25, 'Texas', 15000.00);"
;
stmt
.
executeUpdate
(
sql
);
sql
=
"INSERT INTO "
+
table
+
" (ID,NAME,AGE,ADDRESS,SALARY) "
+
"VALUES (3, 'Teddy', 23, 'Norway', 20000.00);"
;
stmt
.
executeUpdate
(
sql
);
stmt
.
close
();
}
catch
(
Exception
e
) {
e
.
printStackTrace
();
System
.
exit
(-
1
);
}
System
.
out
.
println
(
"Records in database "
+
nameDB
+
" added successfully"
);
}
static
void
selectRecords
(
String
table
) {
try
{
Statement
stmt
=
connect
.
createStatement
();
ResultSet
rs
=
stmt
.
executeQuery
(
"SELECT * FROM "
+
table
+
";"
);
while
(
rs
.
next
()) {
int
id
=
rs
.
getInt
(
"id"
);
String
name
=
rs
.
getString
(
"name"
);
int
age
=
rs
.
getInt
(
"age"
);
String
address
=
rs
.
getString
(
"address"
);
float
salary
=
rs
.
getFloat
(
"salary"
);
System
.
out
.
println
(
"ID = "
+
id
);
System
.
out
.
println
(
"NAME = "
+
name
);
System
.
out
.
println
(
"AGE = "
+
age
);
System
.
out
.
println
(
"ADDRESS = "
+
address
);
System
.
out
.
println
(
"SALARY = "
+
salary
);
System
.
out
.
println
();
}
rs
.
close
();
stmt
.
close
();
}
catch
(
Exception
e
) {
e
.
printStackTrace
();
System
.
exit
(-
1
);
}
}
static
void
updateRecord
(
String
table
) {
try
{
Statement
stmt
=
connect
.
createStatement
();
String
sql
=
"UPDATE "
+
table
+
" set SALARY = 35000.00 where ID=1;"
;
stmt
.
executeUpdate
(
sql
);
stmt
.
close
();
}
catch
(
Exception
e
) {
e
.
printStackTrace
();
System
.
exit
(-
1
);
}
}
static
void
deleteRecord
(
String
table
) {
try
{
Statement
stmt
=
connect
.
createStatement
();
String
sql
=
"DELETE from "
+
table
+
" where ID=2;"
;
stmt
.
executeUpdate
(
sql
);
stmt
.
close
();
}
catch
(
Exception
e
) {
e
.
printStackTrace
();
System
.
exit
(-
1
);
}
}
}
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