JDBC-使用PreparedStatement接口实现增、删、改操作

1 PreparedStatement接口

2 使用PreparedStatement接口实现增、删、改操作
代码框架与Statement类似，Book类和DbUtil类一样，只是修改了增、删、改的类

package com.chb.jdcb;

import java.sql.Connection;
import java.sql.PreparedStatement;

import com.chb.model.Book;
import com.chb.util.DbUtil;

public class test {

	private static DbUtil dbUtil=new DbUtil();
	
	/**
	 * 添加图书
	 * @param book
	 * @return
	 * @throws Exception
	 */
	private static int addBook(Book book)throws Exception{
		Connection con=dbUtil.getCon(); // 获取连接
		String sql="insert into t_book values(null,?,?,?,?)";
		PreparedStatement pstmt=con.prepareStatement(sql);
		pstmt.setString(1, book.getBookName());  // 给第一个坑设置值
		pstmt.setFloat(2, book.getPrice());  // 给第二个坑设置值
		pstmt.setString(3, book.getAuthor()); // 给第三个坑设置值
		pstmt.setInt(4, book.getBookTypeId());  // 给第四个坑设置值
		int result=pstmt.executeUpdate();
		dbUtil.close(pstmt, con);
		return result;
	}
	
	public static void main(String[] args) throws Exception{
		Book book=new Book("Java叉叉2", 1, "叉叉", 1);
		int result=addBook(book);
		if(result==1){
			System.out.println("添加成功！");
		}else{
			System.out.println("添加失败！");
		}
	}
}

package com.chb.jdcb;

import java.sql.Connection;
import java.sql.PreparedStatement;

import com.chb.model.Book;
import com.chb.util.DbUtil;

public class test1 {

	private static DbUtil dbUtil=new DbUtil();
	
	/**
	 * 更新图书
	 * @param book
	 * @return
	 * @throws Exception
	 */
	private static int updateBook(Book book)throws Exception{
		Connection con=dbUtil.getCon();
		String sql="update t_book set bookName=?,price=?,author=?,bookTypeId=? where id=?";
		PreparedStatement pstmt=con.prepareStatement(sql);
		pstmt.setString(1, book.getBookName());
		pstmt.setFloat(2, book.getPrice());
		pstmt.setString(3, book.getAuthor());
		pstmt.setInt(4, book.getBookTypeId());
		pstmt.setInt(5, book.getId());
		int result=pstmt.executeUpdate();
		dbUtil.close(pstmt, con);
		return result;
	}
	
	public static void main(String[] args) throws Exception{
		Book book=new Book(12,"K2", 2, "K", 2);
		int result=updateBook(book);
		if(result==1){
			System.out.println("更新成功！");
		}else{
			System.out.println("更新失败！");
		}
	}
}

package com.chb.jdcb;

import java.sql.Connection;
import java.sql.PreparedStatement;

import com.chb.util.DbUtil;

public class test2 {

	private static DbUtil dbUtil=new DbUtil();
	
	/**
	 * 删除图书
	 * @param id
	 * @return
	 * @throws Exception
	 */
	private static int deleteBook(int id)throws Exception{
		Connection con=dbUtil.getCon();
		String sql="delete from t_book where id=?";
		PreparedStatement pstmt=con.prepareStatement(sql);
		pstmt.setInt(1, id);
		int result=pstmt.executeUpdate();
		dbUtil.close(pstmt, con);
		return result;
	}
	
	public static void main(String[] args)throws Exception {
		int result=deleteBook(12);
		if(result==1){
			System.out.println("删除成功！");
		}else{
			System.out.println("删除失败！");
		}
	}
}