【JAVA】JAVAで各DBに接続する方法(JDBC)の纏め（未完結）
■目録
■ソース
①SQLite3
package cn.com.sy; import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement; public class SQLiteTest { Connection con = null;
Statement stmt = null; public SQLiteTest() { try {
this.getConnection();
this.dropTbl();
this.createTbl();
this.insertData();
this.selectData();
this.updateData();
this.deleteData();
} catch (Exception e) {
System.err.println(e.getClass().getName() + ": " + e.getMessage());
System.exit(0);
} finally {
try {
if (con != null && !con.isClosed()) {
con.close();
System.out.println("DB Connection is Closed.");
}
} catch (Exception e2) {
System.out.println(e2.getMessage());
}
}
} public void getConnection() throws Exception {
Class.forName("org.sqlite.JDBC");
con = DriverManager.getConnection("jdbc:sqlite:./db_data/sqlite/test.db");
System.out.println("DB Connectioning.....");
} public void dropTbl() {
System.out.println("---------------DROP TABLE---------------------");
try {
stmt = con.createStatement();
String sql = "DROP TABLE COMPANY;";
stmt.executeUpdate(sql);
stmt.close();
} catch (Exception e) { }
} public void createTbl() throws Exception {
System.out.println("---------------Create TABLE---------------------");
stmt = con.createStatement();
String sql = "";
sql += "CREATE TABLE COMPANY ";
sql += "(ID INT PRIMARY KEY NOT NULL,";
sql += " NAME TEXT NOT NULL, ";
sql += " AGE INT NOT NULL, ";
sql += " ADDRESS CHAR(50), ";
sql += " SALARY REAL)"; stmt.executeUpdate(sql);
stmt.close();
} public void insertData() throws Exception {
System.out.println("---------------INSERT DATA---------------------");
con.setAutoCommit(false);
stmt = con.createStatement();
String sql = "";
sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " + "VALUES (1, 'Paul', 32, 'California', 20000.00 );";
stmt.executeUpdate(sql); sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " + "VALUES (2, 'Allen', 25, 'Texas', 15000.00 );";
stmt.executeUpdate(sql); sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " + "VALUES (3, 'Teddy', 23, 'Norway', 20000.00 );";
stmt.executeUpdate(sql); sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " + "VALUES (4, 'Mark', 25, 'Rich-Mond ', 65000.00 );";
stmt.executeUpdate(sql); stmt.close();
con.commit();
} public void selectData() throws Exception {
System.out.println("---------------SELECT DATA---------------------");
//con.setAutoCommit(false);
stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM COMPANY;");
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();
} stmt.close();
con.commit();
} public void updateData() throws Exception {
System.out.println("---------------UPDATE DATA---------------------");
con.setAutoCommit(false);
stmt = con.createStatement();
String sql = "UPDATE COMPANY set SALARY = 25000.00 where ID=1;";
stmt.executeUpdate(sql);
con.commit();
ResultSet rs = stmt.executeQuery("SELECT * FROM COMPANY;");
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();
} public void deleteData() throws Exception {
System.out.println("---------------DELETE DATA---------------------");
stmt = con.createStatement();
String sql = "DELETE from COMPANY where ID=2;";
stmt.executeUpdate(sql);
con.commit(); ResultSet rs = stmt.executeQuery("SELECT * FROM COMPANY;");
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();
} public static void main(String[] args) {
new SQLiteTest();
} }
SQLiteTest.java
②H2
package cn.com.sy; import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement; public class H2Test { Connection con = null;
Statement stmt = null;
public H2Test() { try {
this.getConnection();
this.dropTbl();
this.createTbl();
this.insertData();
this.selectData();
this.updateData();
this.deleteData();
} catch (Exception e) {
System.err.println(e.getClass().getName() + ": " + e.getMessage());
System.exit(0);
} finally {
try {
if (con != null && !con.isClosed()) {
con.close();
System.out.println("DB Connection is Closed.");
}
} catch (Exception e2) {
System.out.println(e2.getMessage());
}
}
} public void getConnection() throws Exception {
Class.forName("org.h2.Driver");
con = DriverManager.getConnection("jdbc:h2:./db_data/h2/test.db","SA","PASS");
System.out.println("DB Connectioning.....");
} public void dropTbl() {
System.out.println("---------------DROP TABLE---------------------");
try {
stmt = con.createStatement();
String sql = "DROP TABLE IF EXISTS COMPANY;";
stmt.executeUpdate(sql);
stmt.close();
} catch (Exception e) { }
} public void createTbl() throws Exception {
System.out.println("---------------Create TABLE---------------------");
stmt = con.createStatement();
String sql = "";
sql += "CREATE TABLE COMPANY ";
sql += "(ID INT PRIMARY KEY NOT NULL,";
sql += " NAME VARCHAR(50) NOT NULL, ";
sql += " AGE INT NOT NULL, ";
sql += " ADDRESS VARCHAR(50), ";
sql += " SALARY REAL)"; stmt.executeUpdate(sql);
stmt.close();
} public void insertData() throws Exception {
System.out.println("---------------INSERT DATA---------------------");
con.setAutoCommit(false);
stmt = con.createStatement();
String sql = "";
sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " + "VALUES (1, 'Paul', 32, 'California', 20000.00 );";
stmt.executeUpdate(sql); sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " + "VALUES (2, 'Allen', 25, 'Texas', 15000.00 );";
stmt.executeUpdate(sql); sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " + "VALUES (3, 'Teddy', 23, 'Norway', 20000.00 );";
stmt.executeUpdate(sql); sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " + "VALUES (4, 'Mark', 25, 'Rich-Mond ', 65000.00 );";
stmt.executeUpdate(sql); stmt.close();
con.commit();
} public void selectData() throws Exception {
System.out.println("---------------SELECT DATA---------------------");
//con.setAutoCommit(false);
stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM COMPANY;");
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();
} stmt.close();
con.commit();
} public void updateData() throws Exception {
System.out.println("---------------UPDATE DATA---------------------");
con.setAutoCommit(false);
stmt = con.createStatement();
String sql = "UPDATE COMPANY set SALARY = 25000.00 where ID=1;";
stmt.executeUpdate(sql);
con.commit();
ResultSet rs = stmt.executeQuery("SELECT * FROM COMPANY;");
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();
} public void deleteData() throws Exception {
System.out.println("---------------DELETE DATA---------------------");
stmt = con.createStatement();
String sql = "DELETE from COMPANY where ID=2;";
stmt.executeUpdate(sql);
con.commit(); ResultSet rs = stmt.executeQuery("SELECT * FROM COMPANY;");
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();
} public static void main(String[] args) {
new H2Test();
} }
H2Test.java
③HSQLDB
package cn.com.sy; import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement; public class HSQLTest2 { Connection con = null;
Statement stmt = null;
public HSQLTest2() { try {
this.getConnection();
this.dropTbl();
this.createTbl();
this.insertData();
this.selectData();
this.updateData();
this.deleteData();
} catch (Exception e) {
System.err.println(e.getClass().getName() + ": " + e.getMessage());
System.exit(0);
} finally {
try {
if (con != null && !con.isClosed()) {
con.close();
System.out.println("DB Connection is Closed.");
}
} catch (Exception e2) {
System.out.println(e2.getMessage());
}
}
} public void getConnection() throws Exception {
Class.forName("org.hsqldb.jdbc.JDBCDriver");
con = DriverManager.getConnection("jdbc:hsqldb:./db_data/hsql/test.db","SA","PASS");
System.out.println("DB Connectioning.....");
} public void dropTbl() {
System.out.println("---------------DROP TABLE---------------------");
try {
stmt = con.createStatement();
String sql = "DROP TABLE IF EXISTS COMPANY;";
stmt.executeUpdate(sql);
stmt.close();
} catch (Exception e) { }
} public void createTbl() throws Exception {
System.out.println("---------------Create TABLE---------------------");
stmt = con.createStatement();
String sql = "";
sql += "CREATE TABLE COMPANY ";
sql += "(ID INT PRIMARY KEY NOT NULL,";
sql += " NAME VARCHAR(50) NOT NULL, ";
sql += " AGE INT NOT NULL, ";
sql += " ADDRESS VARCHAR(50), ";
sql += " SALARY REAL)"; stmt.executeUpdate(sql);
stmt.close();
} public void insertData() throws Exception {
System.out.println("---------------INSERT DATA---------------------");
con.setAutoCommit(false);
stmt = con.createStatement();
String sql = "";
sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " + "VALUES (1, 'Paul', 32, 'California', 20000.00 );";
stmt.executeUpdate(sql); sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " + "VALUES (2, 'Allen', 25, 'Texas', 15000.00 );";
stmt.executeUpdate(sql); sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " + "VALUES (3, 'Teddy', 23, 'Norway', 20000.00 );";
stmt.executeUpdate(sql); sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " + "VALUES (4, 'Mark', 25, 'Rich-Mond ', 65000.00 );";
stmt.executeUpdate(sql); stmt.close();
con.commit();
} public void selectData() throws Exception {
System.out.println("---------------SELECT DATA---------------------");
//con.setAutoCommit(false);
stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM COMPANY;");
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();
} stmt.close();
con.commit();
} public void updateData() throws Exception {
System.out.println("---------------UPDATE DATA---------------------");
con.setAutoCommit(false);
stmt = con.createStatement();
String sql = "UPDATE COMPANY set SALARY = 25000.00 where ID=1;";
stmt.executeUpdate(sql);
con.commit();
ResultSet rs = stmt.executeQuery("SELECT * FROM COMPANY;");
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();
} public void deleteData() throws Exception {
System.out.println("---------------DELETE DATA---------------------");
stmt = con.createStatement();
String sql = "DELETE from COMPANY where ID=2;";
stmt.executeUpdate(sql);
con.commit(); ResultSet rs = stmt.executeQuery("SELECT * FROM COMPANY;");
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();
} public static void main(String[] args) {
new HSQLTest2();
} }
HSQLTest2
※補足（Maven Repository）※
参考URL：https://mvnrepository.com/
【H2】
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.4.197</version>
<scope>test</scope>
</dependency>
【HSQLDB】
<dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
<version>2.4.1</version>
<scope>test</scope>
</dependency>
【SQLite】
<dependency>
<groupId>org.xerial</groupId>
<artifactId>sqlite-jdbc</artifactId>
<version>3.25.2</version>
</dependency>
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