packageedu.aeon.jdbc;importjava.sql.Connection;importjava.sql.Driver;importjava.sql.DriverManager;importjava.sql.ResultSet;importjava.sql.SQLException;importjava.sql.Statement;/*** [說明]:測試jdbc

*@authoraeon(qq:1584875179)

**/

public classTest {/*** jdbc執行DQL語句*/

public static voidtestDQL(){

Connection connection=null;

Statement statement=null;

ResultSet resultSet=null;try{

Driver driver=newcom.mysql.jdbc.Driver();

DriverManager.registerDriver(driver);

String url="jdbc:mysql://localhost:3306/jdbc";

String username="root";

String password="root";

connection=DriverManager.getConnection(url, username, password);

statement=connection.createStatement();

String dql_sql="select * from test;";

resultSet=statement.executeQuery(dql_sql);

System.out.println("序號\t名 稱");while(resultSet.next()){int id=resultSet.getInt("id");

String name=resultSet.getString("name");

System.out.println(id+"\t"+name);

}

}catch(SQLException e) {

e.printStackTrace();

}finally{try{if(null!=resultSet){

resultSet.close();

}

}catch(SQLException e) {

e.printStackTrace();

}try{if(null!=statement){

statement.close();

}

}catch(SQLException e) {

e.printStackTrace();

}try{if(null!=connection){

connection.close();

}

}catch(SQLException e) {

e.printStackTrace();

}

}

}/*** jdbc執行DML語句*/

public static voidtestDML(){

Connection connection=null;

Statement statement=null;try{

Driver driver=newcom.mysql.jdbc.Driver();

DriverManager.registerDriver(driver);

String url="jdbc:mysql://localhost:3306/jdbc";

String username="root";

String password="root";

connection=DriverManager.getConnection(url, username, password);

statement=connection.createStatement();

String dml_sql="insert into test(name) values('name6')";int num=statement.executeUpdate(dml_sql);

System.out.println("受影響的行數為："+num);

}catch(SQLException e) {

e.printStackTrace();

}finally{try{if(null!=statement){

statement.close();

}

}catch(SQLException e) {

e.printStackTrace();

}try{if(null!=connection){

connection.close();

}

}catch(SQLException e) {

e.printStackTrace();

}

}

}/*** jdbc執行DDL語句*/

public static voidtestDDL(){

Connection connection=null;

Statement statement=null;try{

Driver driver=newcom.mysql.jdbc.Driver();

DriverManager.registerDriver(driver);

String url="jdbc:mysql://localhost:3306/jdbc";

String username="root";

String password="root";

connection=DriverManager.getConnection(url, username, password);

statement=connection.createStatement();

String ddl_sql="create table users(id int(4) primary key auto_increment,name varchar(10),password varchar(16));";int num=statement.executeUpdate(ddl_sql);

System.out.println("受影響的行數為："+num);

}catch(SQLException e) {

e.printStackTrace();

}finally{try{if(null!=statement){

statement.close();

}

}catch(SQLException e) {

e.printStackTrace();

}try{if(null!=connection){

connection.close();

}

}catch(SQLException e) {

e.printStackTrace();

}

}

}/*** jdbc使用excute方法同時可以執行DQL/DML/DDL語句*/

public static voidtestDQLDMLDDL(){

Connection connection=null;

Statement statement=null;

ResultSet resultSet=null;try{

Driver driver=newcom.mysql.jdbc.Driver();

DriverManager.registerDriver(driver);

String url="jdbc:mysql://localhost:3306/jdbc";

String username="root";

String password="root";

connection=DriverManager.getConnection(url, username, password);

statement=connection.createStatement();

String sql="insert into test(name) values('name6')";if(statement.execute(sql)){//如果返回true則表示執行的是DQL,有結果集返回，如果為false則表示返回的是更新計數器

resultSet=statement.getResultSet();

System.out.println("序號\t名 稱");while(resultSet.next()){int id=resultSet.getInt("id");

String name=resultSet.getString("name");

System.out.println(id+"\t"+name);

}

}else{//如果為false則表示返回的是更新計數器

int num =statement.getUpdateCount();

System.out.println("更新了"+num+"條數據！");

}

}catch(SQLException e) {

e.printStackTrace();

}finally{try{if(null!=statement){

statement.close();

}

}catch(SQLException e) {

e.printStackTrace();

}try{if(null!=connection){

connection.close();

}

}catch(SQLException e) {

e.printStackTrace();

}

}

}public static voidmain(String[] args) {//testDQL();//testDML();//testDDL();

testDQLDMLDDL();

}

}

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