1.所需功能：

游览所有图书、查找书籍、建立新图书，借出和归还图书，删除某一图书

2.流程：

数据库连接

选择需要的操作 释放连接

3.环境及其语言：

Idea，JDK13，驱动包Microsoft JDBC Driver 8.2.2 for SQL Server

4.数据库建立

5.操作：

数据库连接：sql.T3.Test1.java

官网下载驱动包Microsoft JDBC Driver 8.2.2 for SQL Server并加载到程序中。

//注册驱动
	DriverManager.registerDriver(new com.microsoft.sqlserver.jdbc.SQLServerDriver());
//建立连接
String dbUL="jdbc:sqlserver://localhost:1433;DatabaseName=Library";
String Name="sa";
String Paw="123456";
conn=DriverManager.getConnection(dbUL,Name,Paw);

选择需要的操作：sql.T3.Test1.java

1.游览所有图书

try{
          
   
    DriverManager.registerDriver(new com.microsoft.sqlserver.jdbc.SQLServerDriver());
    conn = DriverManager.getConnection(dbUL, Name, Paw);
    st = conn.createStatement();
    sql = "select * from Book";
    rs = st.executeQuery(sql);
    while (rs.next()){
          
   
        int id = rs.getInt("id");
        String name = rs.getString("name");
        String aut = rs.getString("aut");
        int num = rs.getInt("num");
        System.out.println("id=" + id + " name=" + name + " aut:" + aut + " num:" + num);
    }
}catch (SQLException e){
          
   
    e.printStackTrace();
}finally{
          
   
    JDBCUtil.release(conn, st, rs);
}

2.查找书籍

3.建立新图书

4借出图书

5. 归还图书删除某一图书

try{
          
   
    DriverManager.registerDriver(new com.microsoft.sqlserver.jdbc.SQLServerDriver());
    conn = DriverManager.getConnection(dbUL, Name, Paw);
    st = conn.createStatement();
    System.out.println("输入归还书id:");
    book_id = sc.nextInt();
    sql = "select * from Book where id=" + book_id;
    rs = st.executeQuery(sql);
    while (rs.next()){
          
   
        int id = rs.getInt("id");
        String name = rs.getString("name");
        String aut = rs.getString("aut");
        int num = rs.getInt("num");
        System.out.println("id=" + id + " name=" + name + " aut:" + aut + " num:" + num);
        b_h = num;
    }
    b_h++;
    sql1 = "UPDATE Book SET num=" + b_h + "WHERE id =" + book_id;
    st.executeUpdate(sql1);
}catch (SQLException e){
          
   
    e.printStackTrace();
}finally{
          
   
    JDBCUtil.release(conn, st, rs);
}

6.删除某一图书

try{
          
   
    DriverManager.registerDriver(new com.microsoft.sqlserver.jdbc.SQLServerDriver());
    conn = DriverManager.getConnection(dbUL, Name, Paw);
    st = conn.createStatement();
    System.out.println("输入删除书id:");
    book_id = sc.nextInt();
    sql1 = "delete from Book where id=" + book_id;
    st.executeUpdate(sql1);
}catch (SQLException e){
          
   
    e.printStackTrace();
}finally{
          
   
    JDBCUtil.release(conn, st, rs);
}

释放连接: sql.T1.JDBCUtil.java

public static void release(Connection conn, Statement st, ResultSet rs)//当rs不为空时
{
          
   
    closeRs(rs);
    closeSt(st);
    closeConn(conn);
}

public static void release(Connection conn, Statement st)// 当rs为空时
{
          
   
    closeSt(st);
    closeConn(conn);
}

6.运行结果演示 sqlserver中的部分数据：

idea中的演示结果： 显示书籍：

查找书籍及借出：

归还书籍及删除书籍：