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  • initial

    2018-01-08 20:36:00
    首先说说结构化过程语句,在verilog中有两种结构化的过程语句:initial语句和always语句,他们是行为级建模的两种基本语句。其他所有的行为语句只能出现在这两种语句里 与C语言不通,verilog在本质上是并发而非...

    摘自http://blog.csdn.net/liming0931/article/details/7039680

    首先说说结构化过程语句,在verilog中有两种结构化的过程语句:initial语句和always语句,他们是行为级建模的两种基本语句。其他所有的行为语句只能出现在这两种语句里

     

    与C语言不通,verilog在本质上是并发而非顺序的。verilog中的各个执行流程(进程)并发执行,而不是顺序执行的。每个initial语句和always语句代表一个独立的执行过程,每个执行过程从仿真时间0开始执行并且两种语句不能嵌套使用。下面举例解释之:

    initial语句

    所有的initial语句内的语句构成了一个initial块。initial块从仿真0时刻开始执行,在整个仿真过程中只执行一次。如果一个模块中包括了若干个initial块,则这些initial块从仿真0时刻开始并发执行,且每个块的执行是各自独立的。如果在块内包含了多条行为语句,那么需要将这些语句组成一组,一般式使用关键字begin和end将他们组合在一个块语句;如果块内只有一条语句,则不必使用begin和end.下面给出了initial语句的例子:

    [cpp] view plain copy
     
    1. module stimulus  
    2.   
    3. reg x,y, a,b, m  
    4.   
    5. initial  
    6.     m = 1'b0;  
    7.       
    8. initial  
    9. begin  
    10.     #5 a = 1'b1;  
    11.     #25 b = 1'b0;  
    12. end  
    13.   
    14. initial  
    15. begin  
    16.     #10 x = 1'b0;  
    17.     #25 y = 1'b1;  
    18. end  
    19.   
    20. initial  
    21.     #50 $finish;  
    22.       
    23. endmodule  


     


    在上面例子中,三条initial语句在仿真0时刻开始并行执行。如果在某一条语句前面存在延迟#<delay>,那么这条initial语句的仿真将会停顿下来,在经过指定的延迟时间之后再继续执行。因此上面的initial语句执行顺序为:

    [cpp] view plain copy
     
    1. 时间              所执行的语句  
    2. 0                   m = 1'b0;  
    3. 5                   a = 1'b1;  
    4. 10                  x = 1'b0;  
    5. 30                  b = 1'b0;  
    6. 35                  y = 1'b1;  
    7. 50                  $finish;  


     

    摘自《VerilogHDL数字设计与综合(第二版)》夏宇闻译

    转载于:https://www.cnblogs.com/xiaoxuesheng993/p/8244786.html

    展开全文
  • Initial

    2015-05-23 22:49:41
    起源之地。梦与逐的故事。

    起源之地。梦与逐的故事。

    展开全文
  • Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property. 从错误的提示信息中发现字符集设置出现问题 mysql...

     

    Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property.

    从错误的提示信息中发现字符集设置出现问题

     

     

    mysql连接数据库时报此错误:

    //String url = "jdbc:mysql://localhost:3306/db_cjky" 如果使用这句就会报错。
    //Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property.
    String url = "jdbc:mysql://localhost:3306/db_cjky?useUnicode=true&characterEncoding=utf8";//改成这句,就可以了

     

    最终解决方法:

    删除 \WebContent\WEB-INF\lib目录下的。mysql-connector的jar文件。原因是:MySQL驱动和数据库字符集设置不搭配

     

    再补充一下,如果是在mybatis配置文件中的话应该修改成jdbc:mysql://localhost:3306/ssm?useUnicode=true&amp;characterEncoding=utf8

     

     

     

     

    package com.lyq.bean;
    
    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.PreparedStatement;
    import java.sql.ResultSet;
    import java.sql.SQLException;
    import java.sql.Statement;
    import java.util.ArrayList;
    import java.util.List;
    
    /**
     * ��Ʒ���ݿ����
     * @author Li YongQiang
     *
     */
    
    public class BookDao {
    	/**
    	 * ��ȡ���ݿ�����
    	 * @return Connection����
    	 */
    	public Connection getConnection(){
    		// ���ݿ�����
    		Connection conn = null;
    		try {
    			// �������ݿ�������ע�ᵽ����������
    			Class.forName("com.mysql.jdbc.Driver");
    			// ���ݿ������ַ���
    			//String url = "jdbc:mysql://localhost:3306/db_cjky" 如果使用这句就会报错。
    			//Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property.
    			String url = "jdbc:mysql://localhost:3306/db_cjky?useUnicode=true&characterEncoding=utf8";//改成这句,就可以了。
    			// ���ݿ��û���
    			String username = "root";
    			// ���ݿ�����
    			String password = "123456";
    			// ����Connection����
    			conn = DriverManager.getConnection(url,username,password);
    			if(conn!=null)
    			{System.out.println("database is good, you are good");}
    		} catch (ClassNotFoundException e) {
    			e.printStackTrace();
    		} catch (SQLException e) {
    			e.printStackTrace();
    		}
    		// �������ݿ�����
    		return conn;
    	}
    	
    	/**
    	 * ��ҳ��ѯ������Ʒ��Ϣ
    	 * @param page ҳ��
    	 * @return List<Product>
    	 */
    	public List<Product> find(int page){
    		// ����List
    		List<Product> list = new ArrayList<Product>();
    		// ��ȡ���ݿ�����
    		Connection conn = getConnection();
    		// ��ҳ��ѯ��SQL���
    		String sql = "select * from tb_product order by id limit ?,?";
    		try {
    			// ��ȡPreparedStatement
    			PreparedStatement ps = conn.prepareStatement(sql);
    			ps.setInt(1, (page - 1) * Product.PAGE_SIZE);
    			// ��SQL����еĵ�2��������ֵ
    			ps.setInt(2, Product.PAGE_SIZE);
    			// ִ�в�ѯ����
    			ResultSet rs = ps.executeQuery();
    			// �������ƶ������ж��Ƿ���Ч
    			while(rs.next()){
    				// ʵ����Product
    				Product p = new Product();
    				// ��id���Ը�ֵ
    				p.setId(rs.getInt("id"));
    				// ��name���Ը�ֵ
    				p.setName(rs.getString("name"));
    				// ��num���Ը�ֵ
    				p.setNum(rs.getInt("num"));
    				// ��price���Ը�ֵ
    				p.setPrice(rs.getDouble("price"));
    				// ��unit���Ը�ֵ
    				p.setUnit(rs.getString("unit"));
    				// ��Product��ӵ�List������
    				list.add(p);
    			}
    			// �ر�ResultSet
    			rs.close();
    			// �ر�PreparedStatement
    			ps.close();
    			// �ر�Connection
    			conn.close();
    		} catch (SQLException e) {
    			e.printStackTrace();
    		}
    		return list;
    	}
    	
    	/**
    	 * ��ѯ�ܼ�¼��
    	 * @return �ܼ�¼��
    	 */
    	public int findCount(){
    		// �ܼ�¼��
    		int count = 0;
    		// ��ȡ���ݿ�����
    		Connection conn = getConnection();
    		// ��ѯ�ܼ�¼��SQL���
    		String sql = "select count(*) from tb_product";
    		try {
    			// ����Statement
    			Statement stmt = conn.createStatement();
    			// ��ѯ����ȡResultSet
    			ResultSet rs = stmt.executeQuery(sql);
    			// �������ƶ������ж��Ƿ���Ч
    			if(rs.next()){
    				// ���ܼ�¼����ֵ
    				count = rs.getInt(1);
    			}
    			// �ر�ResultSet
    			rs.close();
    			// �ر�Connection
    			conn.close();
    		} catch (SQLException e) {
    			e.printStackTrace();
    		}
    		// �����ܼ�¼��
    		return count;
    	}
    }
    

     

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  • Initial D

    2020-04-12 02:32:57
    目录Initial D Initial D 记录一些技术方面的东西,不谈其他。hope

    目录

    Initial D

    记录一些技术方面的东西,不谈其他。hope

    展开全文
  • RTT Initial measurement

    2020-12-29 23:32:53
    <div><p>On receiving the INITIAL packet, the server passes the CRYPTO data to TLS which then does a bunch of things like computing handshake key, generate INITIAL data etc and then passes it to QUIC....
  • meta name="viewport" content="width=device-width,initial-scale=1.0" 解释 <meta name="viewport" content="width=device-width,initial-scale=1.0"> content属性值 : width:可视区域的宽度,值可为...
  • 15:11:12.650 [S1AP] TO 127.0.1.1:39307 Initial context setup request initiatingMessage: { procedureCode id-InitialContextSetup, criticality reject, value { protocolIEs { { id .
  • conda安装库时报错: conda install keras Collecting package metadata (current_repodata....Solving environment: failed with initial frozen solve. Retrying with flexible solve. Solving environment: fai...
  • 踩了很多坑,网上也查了很多,看懵逼了也没解决,自己捣鼓一下午终于是解决了,解决方法如下: 嗯。。。报错的图当时忘了截。。。...首先把你安装的anaconda卸了重装,反正我是这么干的,强迫症患者,这样干净 ...
  • initial-scale

    2020-06-24 11:12:41
    initial-scale=1.0:表示初始的缩放比例 minimum-scale=0.5:表示最小的缩放比例 maximum-scale=2.0:表示最大的缩放比例 user-scalable=yes:表示用户是否可以调整缩放比例 如果是想要一打开网页,自动以原始比例...
  • <div><p>Is it possible to set initial state based on attribute? In README I see example with static initial state, in closed issues I see examples with static initial state and "initial ...
  • <div><p>In my case, even if you give an initial value to a float variable, json parsing gives you an initial value. Without the initial value, the result is a little bit like 4.6085e+33. ...
  • innitial语句_initial

    2020-12-19 14:23:40
    品牌简介​时装品牌initial于2000年创立,分店分布于主要的购物热点。以法国为的创作团队,致力研发独特的剪裁initialinitial及崭新的设计元素,为顾客带来一次非寻常的体验。Initial相信,时装并非作装饰物,而是一...
  • innitial语句_initial造句

    2020-12-19 14:23:40
    1、This is our initial concentration.2、Financial markets' initial response was euphoric.3、But the initial results are quite promising.4、After initial logarithmic progress growth plateaued sharply.5...
  • <div><p>Select2Choice components always display initial values, except when Settings.setStateless(true) is used (field is always empty). This is because field construction uses getSettings()....
  • Unknown initial character set index '255' received from server. Initial clie 当遇到这句话时,一般是因为 conn=DriverManager.getConnection("jdbc:mysql://localhost/rc","root","123456"); jdbc:mysql://...
  • <div><p>The user data script that executes on the initial manager VM is <strong>not generated via Infrakit</strong> and has specific bootstrapping commands; this works great for the initial manager ...
  • Unknown initial character set index ‘255’ received from server. Initial client character set can be forced via the ‘characterEncoding’ property. 从错误的提示信息中发现字符集设置出现问题 mysql连接...
  • verilog中的initial语句

    千次阅读 2019-01-28 10:53:13
    1.每个initial语句和always语句代表一个独立的执行过程,每个执行过程从仿真时间0开始执行并且两种语句不能嵌套使用。 所有的initial语句内的语句构成了一个initial块。initial块从仿真0时刻开始执行,在整个仿真...
  • Unknown initial character set index ‘255’ received from server. Initial client character set can be forced via the 'characte 编码错误 解决方法: 添加: ?characterEncoding=utf8 运行成功
  • Initial packets are protected with a secret derived from the Destination Connection ID field from the client’s first Initial packet of the connection." This sounds like a second Initial packet ...
  • 1. Field 的 <code>initialValue</code> 同 Form 的 <code>initialValues</code> 冲突时 * Field 的 <code>initialValue</code> 不生效并 warning 2. 多个 Field 同时设置 <code>initialValue</code> 时 * <code>...
  • java.sql.SQLException: Unknown initial character set index ‘45’ received from server. Initial client character set can be forced via the ‘characterEncoding’ property. 问题出现原因大多数使用了MySQL...
  • Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property. 在myeclipe连接JDBC时出现上面这个问题,后来在url后面...
  • Initial Blog

    2009-09-28 20:40:00
    This page is for my initial blog.
  • video initial-time属性

    千次阅读 2018-09-10 18:00:28
    initial-time默认从1s开始播放 initial-time = 1;
  • Unknown initial character set index ‘255’ received from server. Initial client character set can be 这是mysql的连接错误,在网上查找到是编码不匹配的原因 直接在连接的URL后加上?useUnicode=true&...

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