JDBC的CRUD操作之PreparedStatement的删除操作

@Test
	/**
	 * 删除操作
	 */
	public void demo3(){
		Connection conn = null;
		PreparedStatement pstmt  = null;
		try{
			// 获得连接：
			conn = JDBCUtils.getConnection();
			// 编写SQL语句:
			String sql = "delete from user where id = ?";
			// 预编译SQL
			pstmt = conn.prepareStatement(sql);
			// 设置参数:
			pstmt.setInt(1, 4);
			// 执行SQL:
			int num = pstmt.executeUpdate();
			if(num > 0){
				System.out.println("删除成功！");
			}
		}catch(Exception e){
			e.printStackTrace();
		}finally{
			JDBCUtils.release(pstmt, conn);
		}
	}