Home Database Mysql Tutorial 利用数据库如何存入BLOB格式图片,并从数据库中取出BLBO格式图片

利用数据库如何存入BLOB格式图片,并从数据库中取出BLBO格式图片

Jun 07, 2016 pm 03:29 PM
blob use picture how database Format

这两天需要在图片存储性能方面做一些实验,无非就是两种方法,一是将图片以BLOB式存入数据库中,二是将图片路径存入数据库中,然后从数据库中提取出来。 实验数据是从1000张图片中遍历取出100张,样本比较小哈。。。。 下面贴出代码 数据库我使用的是国产达

这两天需要在图片存储性能方面做一些实验,无非就是两种方法,一是将图片以BLOB格式存入数据库中,二是将图片路径存入数据库中,然后从数据库中提取出来。

实验数据是从1000张图片中遍历取出100张,样本比较小哈。。。。

下面贴出代码


数据库我使用的是国产达梦数据库,如果要改其他的话也比较简单。


//package lianjie;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.Blob;
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 javax.imageio.ImageIO;
public class DmTest {
// 定义 DM JDBC 驱动串
String jdbcString = "dm.jdbc.driver.DmDriver";
// 定义 DM URL 连接串
String urlString = "jdbc:dm://localhost:5236/";
// 定义连接用户名
String userName = "SYSDBA";
// 定义连接用户口令
String password = "SYSDBA";
static //定义sql语句
//String sqlString ="create table yujin3(a int,b int,c int);";
String sqlString1="insert into yujin3  values(123,14,1234);";
// 定义连接对象
static Connection conn = null;


static Statement stmt = null;   
static PreparedStatement ps = null;   
static ResultSet rs = null;  


//private static String sqlString1;
/* 加载 JDBC 驱动程序
* @throws SQLException 异常 */
public void loadJdbcDriver() throws SQLException {
try {
System.out.println("Loading JDBC Driver...");
// 加载 JDBC 驱动程序
//DriverManager.registerDriver(new dm.jdbc.driver.DmDriver()); 
Class.forName(jdbcString);
} catch (ClassNotFoundException e) {
throw new SQLException("Load JDBC Driver Error1: " + e.getMessage());
} catch (Exception ex) {
throw new SQLException("Load JDBC Driver Error : "
+ ex.getMessage());
}
}
public void connect() throws SQLException {
try {
System.out.println("Connecting to DM Server...");
// 连接 DM 数据库
conn = DriverManager.getConnection(urlString, userName, password);
} catch (SQLException e) {
throw new SQLException("Connect to DM Server Error : "
+ e.getMessage());
}
}
/* 关闭连接
* @throws SQLException 异常 */
public void disConnect() throws SQLException {
try {
// 关闭连接
conn.close();
System.out.println("close");
} catch (SQLException e) {
throw new SQLException("close connection error : " + e.getMessage());
}
}

public static void main(String args[]) {

	DmTest basicApp = new DmTest();
	// 加载驱动程序
	try {
		basicApp.loadJdbcDriver();
	} catch (SQLException e2) {
		// TODO Auto-generated catch block
		e2.printStackTrace();
	}
	try {
		basicApp.connect();
	} catch (SQLException e2) {
		// TODO Auto-generated catch block
		e2.printStackTrace();
	}
	
	 String sql = "DROP TABLE blobtest";   
     //String sql=null;
     try {   
          stmt = conn.createStatement();   
         System.out.println(sql);   
        stmt.executeUpdate(sql);   
         //创建表   
         sql = "CREATE TABLE blobtest(" +      
         "b_title int,"+   
         "b_text Blob"+    
         ")";   
     System.out.println(sql);   
     stmt.executeUpdate(sql);   
     System.out.println("创建数据表成功!");   
        
     sql="INSERT INTO blobtest(b_title,b_text)VALUES(?,?)";   
     ps = conn.prepareStatement(sql);   
     //插入图片   
     //File file = new File("F:\\image\\yahoo.jpg");   
     for(int i=0;i
<p><span>然后在相应路径下面就生成了100张图片,速度还是比较快的,关于实验数据大家可以去网上下载,或者减少样本,一两张都可以,只是要稍微修改下代码就行。</span><br>
</p>


Copy after login
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

How does Go language implement the addition, deletion, modification and query operations of the database? How does Go language implement the addition, deletion, modification and query operations of the database? Mar 27, 2024 pm 09:39 PM

Go language is an efficient, concise and easy-to-learn programming language. It is favored by developers because of its advantages in concurrent programming and network programming. In actual development, database operations are an indispensable part. This article will introduce how to use Go language to implement database addition, deletion, modification and query operations. In Go language, we usually use third-party libraries to operate databases, such as commonly used sql packages, gorm, etc. Here we take the sql package as an example to introduce how to implement the addition, deletion, modification and query operations of the database. Assume we are using a MySQL database.

How does Hibernate implement polymorphic mapping? How does Hibernate implement polymorphic mapping? Apr 17, 2024 pm 12:09 PM

Hibernate polymorphic mapping can map inherited classes to the database and provides the following mapping types: joined-subclass: Create a separate table for the subclass, including all columns of the parent class. table-per-class: Create a separate table for subclasses, containing only subclass-specific columns. union-subclass: similar to joined-subclass, but the parent class table unions all subclass columns.

iOS 18 adds a new 'Recovered' album function to retrieve lost or damaged photos iOS 18 adds a new 'Recovered' album function to retrieve lost or damaged photos Jul 18, 2024 am 05:48 AM

Apple's latest releases of iOS18, iPadOS18 and macOS Sequoia systems have added an important feature to the Photos application, designed to help users easily recover photos and videos lost or damaged due to various reasons. The new feature introduces an album called "Recovered" in the Tools section of the Photos app that will automatically appear when a user has pictures or videos on their device that are not part of their photo library. The emergence of the "Recovered" album provides a solution for photos and videos lost due to database corruption, the camera application not saving to the photo library correctly, or a third-party application managing the photo library. Users only need a few simple steps

An in-depth analysis of how HTML reads the database An in-depth analysis of how HTML reads the database Apr 09, 2024 pm 12:36 PM

HTML cannot read the database directly, but it can be achieved through JavaScript and AJAX. The steps include establishing a database connection, sending a query, processing the response, and updating the page. This article provides a practical example of using JavaScript, AJAX and PHP to read data from a MySQL database, showing how to dynamically display query results in an HTML page. This example uses XMLHttpRequest to establish a database connection, send a query and process the response, thereby filling data into page elements and realizing the function of HTML reading the database.

Detailed tutorial on establishing a database connection using MySQLi in PHP Detailed tutorial on establishing a database connection using MySQLi in PHP Jun 04, 2024 pm 01:42 PM

How to use MySQLi to establish a database connection in PHP: Include MySQLi extension (require_once) Create connection function (functionconnect_to_db) Call connection function ($conn=connect_to_db()) Execute query ($result=$conn->query()) Close connection ( $conn->close())

How to handle database connection errors in PHP How to handle database connection errors in PHP Jun 05, 2024 pm 02:16 PM

To handle database connection errors in PHP, you can use the following steps: Use mysqli_connect_errno() to obtain the error code. Use mysqli_connect_error() to get the error message. By capturing and logging these error messages, database connection issues can be easily identified and resolved, ensuring the smooth running of your application.

How to insert picture layout hexagonal cluster into PPT How to insert picture layout hexagonal cluster into PPT Mar 26, 2024 pm 05:10 PM

1. Open the slide and insert all pictures. 2. Click Picture Tools | Format | Picture Layout and select the hexagon cluster. 3. Then type the text content in the text box on the left. 4. Select the image and the system will activate the SmartArt tool menu. 5. Click the Design menu, then find the SmartArt style toolset, and then click the Change Color button. 6. Select the color you want in the pop-up theme color drop-down menu. 7. The effect after the design is completed is as shown in the figure below:

What does TikTok recommended video mean? How to use Douyin to recommend videos? What does TikTok recommended video mean? How to use Douyin to recommend videos? Mar 27, 2024 pm 03:01 PM

As a world-renowned short video social platform, Douyin has won the favor of a large number of users with its unique personalized recommendation algorithm. This article will delve into the value and principles of Douyin video recommendation to help readers better understand and make full use of this feature. 1. What is Douyin recommended video? Douyin recommended video uses intelligent recommendation algorithms to filter and push personalized video content to users based on their interests and behavioral habits. The Douyin platform analyzes users' viewing history, like and comment behavior, sharing records and other data to select and recommend videos that best suit users' tastes from a huge video library. This personalized recommendation system not only improves user experience, but also helps users discover more video content that matches their preferences, thereby enhancing user stickiness and retention rate. at this

See all articles