JDBC的简单封装使用，Oracle方向

其他 2019-09-17 19:57:54 阅读次数: 0 
driver=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin:@localhost:1521:XE
user=briup
password=briup

配置文件 jdbc.properties
package com.briup.driver.form.Dao;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

//封装配置文件，注册，连接，关闭资源
//注意事项：
//(1)配置类路径(2)异常处理
public class ConnectionFactory {
    private static String driver;
    private static String url;
    private static String user;
    private static String password;

    static Connection conn;

    // 配置信息
    static {
        Properties p = new Properties();
        try {
            p.load(ConnectionFactory.class.getResourceAsStream("jdbc.properties"));
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        driver = p.getProperty("driver");
        System.out.println(driver);
        url = p.getProperty("url");
        user = p.getProperty("user");
        password = p.getProperty("password");
    }

    // 注册
    public static Connection getConnection() {
        // 1.注册驱动
        try {
            Class.forName(driver);
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        // 2.建立连接
        try {
            conn = DriverManager.getConnection(url, user, password);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return conn;
    }

    // 关闭资源
    // PreparedStatement继承自Statement
    public static void close(Connection conn, Statement stmt) {
        close(null, conn, stmt);
    }

    public static void close(ResultSet rs, Connection conn, Statement stmt) {
        try {
            if (rs != null)
                rs.close();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        try {
            if (stmt != null)
                stmt.close();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        try {
            if (conn != null)
                conn.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    // public static void main(String[] args) {}
}
ConnectionFactory类 
package com.briup.driver.form.Dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;

//封装工具类
public class JDBCUtil {

    public static void execute_DML_stmt(String sql) {
        Connection conn = null;
        Statement stmt = null;
        try {
            conn = ConnectionFactory.getConnection();
            stmt = conn.createStatement();
            stmt.execute(sql);
            System.out.println("操作完成");
            ConnectionFactory.close(conn, stmt);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    // select,需要处理结果集
    public static void executeQuery_select_stmt(String sql, IWorkAdapter work) {
        Connection conn = null;
        Statement stmt = null;
        try {
            conn = ConnectionFactory.getConnection();
            stmt = conn.createStatement();
            ResultSet rs = stmt.executeQuery(sql);
            // 处理结果集
            work.processRs(rs);
            ConnectionFactory.close(conn, stmt);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public static int executeUpdate_DML_ps(String sql, IWorkAdapter work) {
        Connection conn = null;
        PreparedStatement ps = null;
        int change = 0;
        try {
            conn = ConnectionFactory.getConnection();
            ps = conn.prepareStatement(sql);
            work.setValues(ps);
            change = ps.executeUpdate();
            // ps.executeBatch();
            ConnectionFactory.close(conn, ps);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return change;
    }

    public static void executeBatch_DML_ps(String sql, IWorkAdapter work) {
        Connection conn = null;
        PreparedStatement ps = null;

        try {
            conn = ConnectionFactory.getConnection();
            ps = conn.prepareStatement(sql);
            work.setValues(ps);
            ps.executeBatch();
            // ps.executeBatch();
            ConnectionFactory.close(conn, ps);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

    // select，prepareStatement方法
    public static Object executeQuery_select_ps(String sql, IWorkAdapter work) {
        Connection conn = null;
        PreparedStatement ps = null;
        ResultSet rs = null;
        Object object = null;
        try {
            conn = ConnectionFactory.getConnection();
            // 预定义
            ps = conn.prepareStatement(sql);
            // 设置参数
            work.setValues(ps);
            rs = ps.executeQuery();
            object = work.processRs(rs);
            ConnectionFactory.close(conn, ps);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return object;
    }

}
package com.briup.driver.form.Dao;

import java.sql.PreparedStatement;
import java.sql.ResultSet;

public interface IWork {
    // 处理结果集
    public Object processRs(ResultSet rs);

    // PreparedStatement预定义后设置参数
    public void setValues(PreparedStatement ps);
}
IWork类 
package com.briup.driver.form.Dao;

import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class IWorkAdapter implements IWork {

    @Override
    public Object processRs(ResultSet rs) {
        return null;
        // TODO Auto-generated method stub

    }

    @Override
    public void setValues(PreparedStatement ps) {
        // TODO Auto-generated method stub

    }

}
package com.briup.driver.form.Dao;

//缺陷事务都是自动提交的，在增删改查操作的顺序可能会有一定的变化
//根据需求改变代码
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.briup.driver.Student;

public class JDBCFunction {
    // 插入,PreparedStatement 预定义插入
    public static void insert(Student s) {
        String sql = "insert into t_student values(?,?,?)";
        JDBCUtil.executeUpdate_DML_ps(sql, new IWorkAdapter() {
            @Override
            public void setValues(PreparedStatement ps) {
                try {
                    ps.setInt(1, s.getId());
                    ps.setString(2, s.getName());
                    ps.setInt(3, s.getAge());
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }

        });
        System.out.println("插入成功");
    }

    // 改 根据id
    public static void update(Student s) {
        String sql = "update t_student set name= ? where id = ?";
        int change = JDBCUtil.executeUpdate_DML_ps(sql, new IWorkAdapter() {
            @Override
            public void setValues(PreparedStatement ps) {
                try {
                    ps.setString(1, "fys");
                    ps.setInt(2, s.getId());
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        });
        if (change == 0) {
            System.out.println("修改的数据不存在");
        } else {
            System.out.println("修改成功");
        }
    }

    // DML删除，根据id
    public static void delete(Student s) {
        String sql = "delete from t_student where id =?";
        int change = JDBCUtil.executeUpdate_DML_ps(sql, new IWorkAdapter() {
            @Override
            public void setValues(PreparedStatement ps) {
                try {
                    ps.setInt(1, s.getId());
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        });
        if (change == 0) {
            System.out.println("删除的数据不存在");
        } else {
            System.out.println("删除成功");
        }
    }

    // 查,根据id
    public static Student select(Student s) {

        String sqlS = "select * from t_student where id=?";
        Object object = JDBCUtil.executeQuery_select_ps(sqlS, new IWorkAdapter() {
            @Override
            public void setValues(PreparedStatement ps) {
                try {
                    ps.setInt(1, s.getId());
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }

            @Override
            public Student processRs(ResultSet rs) {
                Student s1 = null;
                try {
                    while (rs.next()) {
                        int id = rs.getInt("id");
                        String name = rs.getString("name");
                        int age = rs.getInt("age");
                        s1 = new Student(id, name, age);
                    }
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                return s1;

            }
        });
        if (object == null) {
            System.out.println("查找的数据不存在");
            return null;
        } else {
            return (Student) object;
        }
    }

    // 插入批处理
    public static void insertBatch(List<Student> list) {
        String sqlI = "insert into t_student values(?,?,?)";
        JDBCUtil.executeBatch_DML_ps(sqlI, new IWorkAdapter() {
            @Override
            public void setValues(PreparedStatement ps) {
                try {
                    for (int i = 0; i < list.size(); i++) {
                        ps.setLong(1, list.get(i).getId());
                        ps.setString(2, list.get(i).getName());
                        ps.setInt(3, list.get(i).getAge());
                        ps.addBatch();
                    }

                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }

        });
        System.out.println("插入完毕");
    }

    // 插入批删除
    public static void deleteBatch(List<Student> list) {
        String sqlI = "delete from t_student where id =?";
        JDBCUtil.executeBatch_DML_ps(sqlI, new IWorkAdapter() {
            @Override
            public void setValues(PreparedStatement ps) {
                try {
                    for (int i = 0; i < list.size(); i++) {
                        ps.setInt(1, list.get(i).getId());
                        ps.addBatch();

                    }

                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }

        });
        System.out.println("删除完毕");
    }

}
JDBCFunction

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