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Mysql:1292 truncated incorrect double value -- concat 函数用法

Gavin.lee — Fri, 01 Jul 2011 04:57:00 GMT

update 表，做整体替换时��Z��?/p>

update service_config set update_url = 'xxxxxxxx' + agent_id + '.apk';

update service_config set update_url = concat('xxxxxxxx', agent_id, '.apk');

语义�Q�更新表service_config的update_url字段

�q�回�l�果��接参��C�生的字符丌Ӏ�如有�Q何一个参��CؓNULL �Q�则�q�回��gؓ NULL�?br />

Gavin.lee 2011-07-01 12:57 发表评论

Gavin.lee — Sat, 25 Jun 2011 11:08:00 GMT

NOW()函数以`'YYYY-MM-DD HH:MM:SS'�q�回当前的日期时��_��可以直接存到DATETIME字段中�?br />CURDATE()�?#8217;YYYY-MM-DD’的格式返回今天的日期�Q�可以直接存到DATE字段中�?br />CURTIME()�?#8217;HH:MM:SS’的格式返回当前的旉��Q�可以直接存到TIME字段中�?br />例：insert into tablename (fieldname) values (now())

原文�Q?a >http://www.hackbase.com/lib/2006-09-21/22505.html

Gavin.lee 2011-06-25 19:08 发表评论

hibernate.dialect (Hibernate SQL方言)-备用

Gavin.lee — Thu, 17 Feb 2011 03:07:00 GMT

RDBMS	方言
DB2	`org.hibernate.dialect.DB2Dialect`
DB2 AS/400	`org.hibernate.dialect.DB2400Dialect`
DB2 OS390	`org.hibernate.dialect.DB2390Dialect`
PostgreSQL	`org.hibernate.dialect.PostgreSQLDialect`
MySQL	`org.hibernate.dialect.MySQLDialect`
MySQL with InnoDB	`org.hibernate.dialect.MySQLInnoDBDialect`
MySQL with MyISAM	`org.hibernate.dialect.MySQLMyISAMDialect`
Oracle (any version)	`org.hibernate.dialect.OracleDialect`
Oracle 9i/10g	`org.hibernate.dialect.Oracle9Dialect`
Sybase	`org.hibernate.dialect.SybaseDialect`
Sybase Anywhere	`org.hibernate.dialect.SybaseAnywhereDialect`
Microsoft SQL Server	`org.hibernate.dialect.SQLServerDialect`
SAP DB	`org.hibernate.dialect.SAPDBDialect`
Informix	`org.hibernate.dialect.InformixDialect`
HypersonicSQL	`org.hibernate.dialect.HSQLDialect`
Ingres	`org.hibernate.dialect.IngresDialect`
Progress	`org.hibernate.dialect.ProgressDialect`
Mckoi SQL	`org.hibernate.dialect.MckoiDialect`
Interbase	`org.hibernate.dialect.InterbaseDialect`
Pointbase	`org.hibernate.dialect.PointbaseDialect`
FrontBase	`org.hibernate.dialect.FrontbaseDialect`
Firebird	`org.hibernate.dialect.FirebirdDialect`

Gavin.lee 2011-02-17 11:07 发表评论

Gavin.lee — Thu, 04 Nov 2010 06:10:00 GMT

proxool�q�接�?br /> (1) 先写proxool的配�|�文�Ӟ��文�g名：proxool.xml�Q�一般放在与hibernate.cfg.xml文�g在同一个目录中�Q�本例配�|�的是MYSQL数据库，数据库的名字为schoolproject

xml version="1.0" encoding="UTF-8"?>

<something-else-entirely>
<proxool>


   <alias>DBPoolalias>



   <driver-url>jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8driver-url>

   —JDBC驱动�E�序-->
   <driver-class>com.mysql.jdbc.Driverdriver-class>
   <driver-properties>
    <property name="user" value="root"/>
    <property name="password" value=""/>
   driver-properties>


   <house-keeping-sleep-time>90000house-keeping-sleep-time>


   <maximum-new-connections>20maximum-new-connections>


   <prototype-count>5prototype-count>


   <maximum-connection-count>100maximum-connection-count>


   <minimum-connection-count>10minimum-connection-count>

proxool>
something-else-entirely>

(2)配置hibernate.cfg.xml文�g

xml version='1.0' encoding='UTF-8'?>

DOCTYPE hibernate-configuration
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory >
   <property name="hibernate.connection.provider_class">org.hibernate.connection.ProxoolConnectionProviderproperty>
   <property name="hibernate.proxool.pool_alias">DBPoolproperty>
   <property name="hibernate.proxool.xml">proxoolconf.xmlproperty>


   <property name="show_sql">trueproperty>


   <property name="dialect">org.hibernate.dialect.MySQLDialectproperty>


   <mapping resource="com/wqbi/model/pojo/student.hbm.xml" />
session-factory>
hibernate-configuration>

(1) hibernate.connection.provider_class定义Hibernate的连接加载类�Q�这里Proxool�q�接池是用这个，不同的连接池有不同的加蝲�c�，可以查阅Hibernate文档获取相关信息
(2) hibernate.proxool.pool_alias�q�里��是用我们上面提到的�q�接池的别名
(3) hibernate.proxool.xml是向Hibernate声明�q�接池的配置文�g位置�Q�可以用相对或绝对�\径，用相对�\径时要注意一定在要Path范围内！不然会抛出异常�?br /> (4) dialect是声明Ｓ�Q�Ｌ语句的方�a�
(5) show_sql定义是否昄��Hibernate生成的Ｓ�Q�Ｌ语言�Q�一般在调试阶段设�ؓtrue,完成后再�Ҏ��false�Q�这��h��利于调试�?br /> (6) 资源文�g映射

Gavin.lee 2010-11-04 14:10 发表评论

Gavin.lee — Sat, 13 Mar 2010 19:43:00 GMT

http://blog.csdn.net/coklo/archive/2009/02/22/3920346.aspx

Gavin.lee 2010-03-14 03:43 发表评论

Gavin.lee — Sun, 13 Dec 2009 07:58:00 GMT

下面是一哥们的文章，出处�Q?a >http://dev.yesky.com/154/7530154.shtml
我姑且不看他的内容，主要看下做法�Q?br /> 一下意思就是插入一条数据，无则插入�Q�有则失败：
创徏表：

CREATE TABLE [BookUser] (
    [UserID] [int] IDENTITY (1, 1) NOT NULL ,
    [UserName] [varchar] (50) COLLATE Chinese_PRC_CI_AS NOT NULL ,
    [Title] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NOT NULL ,
    [Guid] [uniqueidentifier] NOT NULL CONSTRAINT [DF_BookUser_Guid] DEFAULT (newid()),
    [BirthDate] [datetime] NOT NULL ,
    [Description] [ntext] COLLATE Chinese_PRC_CI_AS NOT NULL ,
    [Photo] [image] NULL ,
    [Other] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL CONSTRAINT
           [DF_BookUser_Other] DEFAULT ('默认�?/span>'),
    CONSTRAINT [PK_BookUser] PRIMARY KEY  CLUSTERED
    (
        [UserID]
    )  ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO

创徏存储�q�程�Q?

CREATE PROCEDURE InsertUser
@UserName varchar(50),
@Title varchar(255),
@Guid uniqueidentifier,
@BirthDate DateTime,
@Description ntext,
@Photo image,
@Other nvarchar(50),
@UserID int output
As

Set NOCOUNT ON
If Exists (select UserID from BookUser Where UserName = @UserName)
RETURN 0
ELSE
Begin
INSERT INTO BookUser (UserName,Title,Guid,BirthDate,Description,Photo,Other) VALUES(@UserName,@Title,@Guid,@BirthDate,@Description,@Photo,@Other)
SET @UserID = @@IDENTITY
RETURN 1
End
GO

JSP�Q?

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    <title>My JSP 'MyJsp2.jsp' starting pagetitle>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">


  head>
  <body>
�Q?
    //注意�Q�下面的�q�接�Ҏ��采用最新的SQL Server的JDBC�Q?br />     //请到 http://msdn2.microsoft.com/zh-cn/data/aa937724.aspx 下蝲
    Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
    String url="jdbc:sqlserver://localhost:1433;databaseName=Book;user=sa;password=";
    String sql = "{? = call InsertUser(?,?,?,?,?,?,?,?)}";
    Connection cn = null;
    CallableStatement cmd = null;
    try {
        cn = DriverManager.getConnection(url);
        cmd = cn.prepareCall(sql);
        java.util.UUID Guid = java.util.UUID.randomUUID();
        String FilePath = application.getRealPath("") + "\test\logo.gif";
        java.io.FileInputStream f = new java.io.FileInputStream(FilePath);
        Date rightNow = Date.valueOf("2007-9-9");
        cmd.setString("UserName","mengxianhui"); //注意修改�q�里�Q�存储过�E�验证了UserName的唯一性�?br />         cmd.setString("Title","孟宪�?);
        cmd.setString("Guid",Guid.toString());
        cmd.setString("BirthDate","2007-9-9");
        cmd.setDate("BirthDate",rightNow);
        cmd.setString("Description","【孟子E章�?);
        cmd.setBinaryStream("Photo",f,f.available());
        cmd.setString("Other",null);
        cmd.registerOutParameter(1,java.sql.Types.INTEGER);
        cmd.registerOutParameter("UserID",java.sql.Types.INTEGER);
    　    cmd.execute();
        int returnValue = cmd.getInt(1);
    　    int UserID = cmd.getInt("UserID");
        if(returnValue == 1)　{
    　　        out.print("�Q�li�Q�添加成功！");
    　　        out.print("�Q�li�Q�UserID = " + UserID);
    　　        out.print("�Q�li�Q�returnValue = " + returnValue);
        }　else　{
            out.print("�Q�li�Q�添加失败！");
        }
    　    f.close();
    } catch(Exception e) {
        out.print(e.getLocalizedMessage());
    }finally {
    　    try　{
        　　    if(cmd != null)　{
                cmd.close();
        　　　    cmd = null;
        　　    } if(cn != null)　{
        　　　    cn.close();
        　　　    cn = null;
        　　    }
    　    } catch (Exception e) {
    　　        e.printStackTrace();
        }
    }
%�Q?br /> body>
html>

用了�q�么久，才知道原来这么基��的我都还没搞清楚�Q�惭愧啊�Q�多谢这位仁兄了··

Gavin.lee 2009-12-13 15:58 发表评论

C3P0�q�接�?---Resin

Gavin.lee — Thu, 10 Dec 2009 09:42:00 GMT

摘要: C3P0.xml �q�接池配�|�文�Ӟ��