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一、整形的显示宽度 　　在mysql的数据类型中有如下定义， 整型类型(显示宽度) 　　注意，正确的理解，其实是显示宽度， 因为整型的显示宽度，对数值大小无影响，只是当设置了zerofill的时候，在显示的时候补0而已。 　　 从上面的显示我们看到，设置了宽度为5， 并且zerofill了 ，这样在查询的时候，会在前面自动补0。 宽度可以不设置，因为整数数据类型都有默认的显示宽度，不设就采用默认的。 　　另外，即使设置了显示宽度，也能赋超过显示宽度的值，整型的显示宽度仅仅用于显示补0。 　 二、浮点型与定点型 　　在mysql的数据类型中浮点型分为两种，float()与double()类型，定点型为decimal()。 数据类型(M,D) M：精度，数据的总长度； D：标度，小数点后的长度； 　　其区别在于： 当不指定精度时，Float、Double默认会保存实际精度，而Decimal默认是整数； 当标度不够时，都会四舍五入，但Decimal会警告信息。 　　 三、日期与时间类型 　　MySQL日期时间所有种类如下： 类型 字节数 取值范围 零值 YEAR 1 1901~2155 0000 DATE 4 1000-01-01~9999-12-31 0000:00:00 TIME 3 -838:59:59~838:59:59 00:00:00 DATETIME 8 1000-01

In POJO i have: public void setBlob(InputStream in, Long l) { this.blob = Hibernate.getLobCreator(SessionFactoryHelper.sessionFactory.getCurrentSession()).createBlob(in, l); } I made hibernate.jdbc.use_streams_for_binary true in config, but does it really change something? when saving entity, on session.flush() i get: org.hibernate.engine.jdbc.batch.internal.AbstractBatchImpl release INFO: HHH000010: On release of batch it still contained JDBC statements Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap space Heap dump file created [46180174 bytes in 1.662 secs] at

I am just trying to Convert a blob string which is in Database to Byte array and then after converting it convert to buffered Image and then assign it to a label Here's my code package ims.project; import java.sql.*; import javax.swing.*; import java.awt.*; import java.awt.image.BufferedImage; import java.io.ByteArrayInputStream; import javax.imageio.ImageIO; public class readingdata extends JFrame { readingdata() { JPanel pane = new JPanel(); JLabel label1 = new JLabel("help"); JLabel label2 = new JLabel("33"); pane.add(label1); pane.add(label2); setVisible(true); add(pane); try { Class

This question already has answers here : Possible Duplicate: Storing Images in DB - Yea or Nay? Images in database vs file system I've been developing a web application using RIA technologies (Flex + PHP + MySQL + Ajax) and now I'm in a dilemma about image files. I use some images in my Flex app, so I think "it could be awesome if I store them into database, and then retrieve from it; consecuently, maintain process should be more easy". But, here is my dilemma: Should I store the physical URL of my images, or is going to be better if I store directly the image? For example, should my Cars

1. 进行数据库的设置 create table image_lob(t_id varchar2(5) not null,t_image blob not null); create or replace directory "images" as 'f:\pic\'; create or replace procedure img_insert(tid varchar2,filename varchar2)as f_lob bfile; b_lob blob; begin insert into image_lob(t_id,t_image) values(tid,empty_blob())return t_image into b_lob; f_lob:=bfilename('images',filename); dbms_lob.fileopen(f_lob,dbms_lob.file_readonly); dbms_lob.loadfromfile(b_lob,f_lob, dbms_lob.getlength(f_lob)); dbms_lob.fileclose(f_lob); commit; end; / 在 f:\pic 文件夹下(这个需要自己建立)， 一张图片 cat.png exec img_insert('1','cat.png'); 或者 CALL IMG

SQL Server 数据类型 Oracle 数据类型 bigint NUMBER(19,0) binary(1-2000) RAW(1-2000) binary(2001-8000) BLOB bit NUMBER(1) char(1-2000) CHAR(1-2000) char(2001-4000) VARCHAR2(2001-4000) char(4001-8000) CLOB date DATE datetime DATE datetime2(0-7) TIMESTAMP(7)（对于 Oracle 9 和 Oracle 10）；VARCHAR(27)（对于 Oracle 8） datetimeoffset(0-7) TIMESTAMP(7) WITH TIME ZONE（对于 Oracle 9 和 Oracle 10）；VARCHAR(34)（对于 Oracle 8） decimal(1-38, 0-38) NUMBER(1-38, 0-38) float(53) FLOAT float FLOAT 地理 BLOB geometry BLOB hierarchyid BLOB 图像 BLOB int NUMBER(10,0) money NUMBER(19,4) nchar(1-1000) CHAR(1-1000) nchar(1001-4000) NCLOB ntext

I've got following issue and I can't find resolution. I created endpoint with Spring Boot and when I'm using Postman I'm getting response with image on body request. But when I'm trying download and save file on computer using Angular and Blob and FileSaver my saved file is unable to read. This is my angular controller: vm.download = function (filename) { console.log("Start download. File name:", filename); $http.get('api/files/download/' + filename) .then(function (response) { console.log(data); var data = new Blob([response.data], {type: 'image/jpeg;charset=UTF-8'}); FileSaver.saveAs(data,

I want to download xlsx file from the client on angular 2 using rest api. I'm getting a byte array as a response from my GET request and I'm sending it to download function with subscribe: let options = new RequestOptions({ search: params }); this.http.get(this.restUrl, options) .subscribe(this.download); download function using blob: download(res: Response) { let data = new Blob([res.arrayBuffer()], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;' }); FileSaver.saveAs(data, this.fileName);}; my problem is that my file is corrupted all the time. I tried a lot of