Java连接数据库，及增删改查

自定义连接数据库的util类

package com.shuzf.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class JDBCUtil {
    // 定义驱动器类的路径
    private static final String DRIVER = "oracle.jdbc.driver.OracleDriver";
    // 定义用于连接数据库的URL
    private static final String URL = "jdbc:oracle:thin****l";
    // 定义用于访问数据库的用户名及密码
    private static final String USERNAME = "s****t";
    private static final String PASSWORD = "t***r";

    // 加载驱动器类
    static {
        try {
            Class.forName(DRIVER);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    // 定义获得连接的方法
    public static Connection getConnection() {
        Connection conn = null;
        ;
        try {
            conn = DriverManager.getConnection(URL, USERNAME, PASSWORD);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return conn;
    }

    // 定义释放数据库资源的方法
    public static void destory(Connection con, Statement stat, ResultSet rs) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (stat != null) {
            try {
                stat.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (con != null) {
            try {
                con.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

}

基本类

package com.shuzf.jdbc;

public class Student {
    private Integer Id;
    private String Name;
    private String Sex;
    private int Age;
     
    public Student() {
        super();
    }
    public Student(String name, String sex, int age) {
        Id = null;
        Name = name;
        Sex = sex;
        Age = age;
    }
    public Integer getId() {
        return Id;
    }
    public void setId(Integer id) {
        Id = id;
    }
    public String getName() {
        return Name;
    }
    public void setName(String name) {
        Name = name;
    }
    public String getSex() {
        return Sex;
    }
    public void setSex(String sex) {
        Sex = sex;
    }
    public int getAge() {
        return Age;
    }
    public void setAge(int age) {
        Age = age;
    }

}

增删改查

package com.shuzf.jdbc;

import java.sql.Connection;
import java.sql.Date;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

public class JdbcTest {

    public int insert(Student student) {
        Connection conn = JDBCUtil.getConnection();
        int i = 0;
        PreparedStatement pst = null;
        String sql = "insert into students (Name,Sex,Age,Addtime) values(?,?,?,?)";
        try {
            pst = conn.prepareStatement(sql);
            pst.setString(1, student.getName());
            pst.setString(2, student.getSex());
            pst.setInt(3, student.getAge());
            pst.setDate(4, new Date(new java.util.Date().getTime()));
            i = pst.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            JDBCUtil.destory(conn, pst, null);
        }
        return i;
    }

    public int update(Student student) {
        Connection conn = JDBCUtil.getConnection();
        int i = 0;
        PreparedStatement pst = null;
        String sql = "update students set Age='" + student.getAge() + "' where Name='" + student.getName() + "'";
        try {
            pst = conn.prepareStatement(sql);
            i = pst.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            JDBCUtil.destory(conn, pst, null);
        }
        return i;
    }

    public int delete(Student student) {
        Connection conn = JDBCUtil.getConnection();
        int i = 0;
        PreparedStatement pst = null;
        String sql = "delete from students where Name='" + student.getName() + "'";
        try {
            pst = conn.prepareStatement(sql);
            i = pst.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            JDBCUtil.destory(conn, pst, null);
        }
        return i;
    }

    public ArrayList<Student> getStudent(String name) {
        Connection conn = JDBCUtil.getConnection();
        PreparedStatement pst = null;
        ResultSet rs = null;
        ArrayList<Student> students = new ArrayList<Student>();
        String sql = "select * from students where Name='" + name + "'";
        try {
            pst = conn.prepareStatement(sql);
            rs = pst.executeQuery();
            // int count = rs.getMetaData().getColumnCount();// 指示列数目的 int值
            while (rs.next()) {
                Student s = new Student();
                s.setId(rs.getInt("id"));
                s.setName(rs.getString("name"));
                s.setSex(rs.getString("sex"));
                s.setAge(rs.getInt("age"));
                students.add(s);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            JDBCUtil.destory(conn, pst, rs);
        }
        return students;
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub

    }

}