JAVA_JDBC

测试类：
 1 import java.util.ArrayList;
 import java.util.List;

 /**
  * 创建数据库：
  *     1.加载驱动
  *         Class.forName("org.sqlite.JDBC");
  *     2.通过驱动管理类获得Connection对象 jdbc:sqlite:+数据库的路径
  *         Connection connection = DriverManager.getConnection("jdbc:sqlite:d:/myTest.db");
  *     3.通过Connection对象获得Statement对象
  *         Statement statement = connection.createStatement();
  *    4.通过statement对象执行sql语句,获得结果集
  *        ResultSet rSet = statement.executeQuery("select * from Student");
  *
  * @author Administrator
  *
  */
 /**
  * exc:
  *     通过Java代码实现，创建表，并对其进行增删改查的功能
  *
  * 注意：需自导入 sqlitejdbc-0.5.4.jar
  * @author Administrator
  *    !!!
  *    如果出现以下错误：Unsupported major.minor version 52.0
  *    解决方法：    修改编译方式，降低javaee ,javase的版本，同时让编译方式和Jdk版本对应。
  *            右击项目 properties或者alt + enter 选择java Complier 选择 Complier compliance level的版本和当前jdk版本对应，
  *            如果是web项目还要降低 jstl 和javaee的版本。
  */
 public class Test {
     public static void main(String[] args) {
         TestJDBC tj = new TestJDBC();
         tj.createTable();
         tj.addUser("张三", "男");
         tj.addUser("李四", "女");
         tj.addUser("王五", "男");
         tj.addUser("赵六", "男");
         System.out.println(    "增："+tj.addUser("周七", "女"));
         System.out.println("删："+tj.deleteUser(4));
         System.out.println("改："+tj.updateUser(2, "haha", "不详"));
         List<User> list = tj.getAllUser();
         for (User user : list) {
             System.out.println("查："+user);
         }

     }
 }

User类：

 public class User {
     private String name;
     private int _id;
     private String sex;
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public int getId() {
         return _id;
     }
     public void setId(int id) {
         this._id = id;
     }
     public String getSex() {
         return sex;
     }
     public void setSex(String sex) {
         this.sex = sex;
     }
     @Override
     public String toString() {
         return "User [name=" + name + ", _id=" + _id + ", sex=" + sex + "]";
     }

 }

TestJDBC类

 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
 import java.util.ArrayList;
 import java.util.List;

 public class TestJDBC {
     Connection con;//数据库一个连接对象
     Statement statement;//执行sql语句
     ResultSet rs;//得到select语句执行的结果集

     public Statement getStatement(){
         try {
             //加载驱动
             Class.forName("org.sqlite.JDBC");
             //获得connection对象
             con = DriverManager.getConnection("jdbc:sqlite:d:/mySqlite.db");//没有会自动创建一个数据库
             //得到Statement对象
             statement = con.createStatement();
         } catch (ClassNotFoundException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return statement;

     }
     public void closeConnection(){
         if(con!= null){
             try {
                 con.close();
             } catch (SQLException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
             }
         }
         if(statement != null){
             try {
                 statement.close();
             } catch (SQLException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
             }
         }

     }
     public void createTable(){
         statement = getStatement();
         try {
             statement.execute("create table if not exists User(_id Integer primary key autoincrement,name varchar(20),sex varchar(20))");
         } catch (SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }finally{
             closeConnection();
         }
     }
     public boolean addUser(String name,String sex){
         statement = getStatement();
         try {
             //insert into User(name,age) values('张三',18)
             int count = statement.executeUpdate("insert into User(name,sex) values('"+name+"','"+sex+"')");
             if(count>0){
                 return true;
             }
         } catch (SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }finally{
             closeConnection();
         }
         return false;
     }
     public boolean deleteUser(int id){
         statement = getStatement();
         try {
             int count = statement.executeUpdate("delete from User where _id = "+id);
             if(count>0)
                 return true;
         } catch (SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return false;
     }
     public boolean updateUser(int id,String name,String sex){
         statement = getStatement();
         try {
             int count = statement.executeUpdate("update User set name='"+name+"',sex='"+sex+"'where _id ="+id);
             if(count>0)
                 return true;
         } catch (SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return false;
     }
     public List<User> getAllUser(){
         List<User> list = new ArrayList<User>();

         statement =  getStatement();
         try {
             rs = statement.executeQuery("select * from User");
             while(rs.next()){
                 User user = new User();
                 user.setName(rs.getString("name"));
                 user.setSex(rs.getString("sex"));
                 user.setId(rs.getInt("_id"));
                 list.add(user);
             }
         } catch (SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }finally{
             closeConnection();
         }

         return list;

     }
 }