JavaScript operation Oracle database example_javascript skills
I am still a newbie in the IT world and have not been working for a long time. However, with my eagerness to learn and my never-ending pace of learning, I have gained a lot in programming~~
I always thought that JavaScript must call server-side code (C# or JAVA) through AJAX if it wants to interact with the database, but recently I discovered that JavaScript can interact with the database directly... The following is a simple call from the database A small example of loading data into the interface (if you have any good suggestions about JS operation data, I hope you can leave them, we can learn from each other and make progress together)~~
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script type="text/javascript">
function getData()
{
//定义SQL语句
var sql = "select obj_id,obj_caption from mw_sys.mwt_om_obj where rownum<5000";
//新建数据库连接对象和数据集存取对象
var ConnDB = new ActiveXObject("ADODB.Connection");
ConnDB.open("Provider=MSDAORA.1;Password=app;User ID=mw_app;Data Source=pms;Persist Security Info=True");
var rs = new ActiveXObject("ADODB.Recordset");
rs.ActiveConnection = ConnDB;
rs.Open(sql);
//遍历
var s;
var rownum=0;
var shtml="<table cellpadding=0; cellspacing=0; style='border:solid 1px gray;'><thead><td style='border:solid 1px gray; text-align:center;'>行号</td><td style='border:solid 1px gray; text-align:center;'>作业文本ID号</td><td style='border:solid 1px gray;'>专业编号</td><tbody>";
while(!rs.EOF)
{
shtml+="<tr><td style='border:solid 1px gray; text-align:center;'>";
shtml+=rownum+1;
shtml+="</td>";
for(i = 0;i<rs.Fields.Count;++i)
{
shtml+="<td style='border:solid 1px gray; background-color:yellow;'>";
shtml+=rs.Fields(i).value==null?" ":rs.Fields(i).value;
shtml+="</td>";
}
shtml+="</tr>";
rownum++;
if(rownum==1000)
break;
rs.MoveNext();
}
shtml+="</tbody></table>";
rs.close();
ConnDB.close();
document.getElementById("data").innerHTML=shtml;
}
</script>
</HEAD>
<BODY>
<input type="button" value="Table" onclick="getData()"/>
<div id="data">
</div>
</BODY>
</HTML>
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1664
14
1423
52
1317
25
1268
29
1245
24
MySQL: An Introduction to the World's Most Popular Database
Apr 12, 2025 am 12:18 AM
MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.
How to create cursors in oracle loop
Apr 12, 2025 am 06:18 AM
In Oracle, the FOR LOOP loop can create cursors dynamically. The steps are: 1. Define the cursor type; 2. Create the loop; 3. Create the cursor dynamically; 4. Execute the cursor; 5. Close the cursor. Example: A cursor can be created cycle-by-circuit to display the names and salaries of the top 10 employees.
Why Use MySQL? Benefits and Advantages
Apr 12, 2025 am 12:17 AM
MySQL is chosen for its performance, reliability, ease of use, and community support. 1.MySQL provides efficient data storage and retrieval functions, supporting multiple data types and advanced query operations. 2. Adopt client-server architecture and multiple storage engines to support transaction and query optimization. 3. Easy to use, supports a variety of operating systems and programming languages. 4. Have strong community support and provide rich resources and solutions.
What steps are required to configure CentOS in HDFS
Apr 14, 2025 pm 06:42 PM
Building a Hadoop Distributed File System (HDFS) on a CentOS system requires multiple steps. This article provides a brief configuration guide. 1. Prepare to install JDK in the early stage: Install JavaDevelopmentKit (JDK) on all nodes, and the version must be compatible with Hadoop. The installation package can be downloaded from the Oracle official website. Environment variable configuration: Edit /etc/profile file, set Java and Hadoop environment variables, so that the system can find the installation path of JDK and Hadoop. 2. Security configuration: SSH password-free login to generate SSH key: Use the ssh-keygen command on each node
What to do if the oracle log is full
Apr 12, 2025 am 06:09 AM
When Oracle log files are full, the following solutions can be adopted: 1) Clean old log files; 2) Increase the log file size; 3) Increase the log file group; 4) Set up automatic log management; 5) Reinitialize the database. Before implementing any solution, it is recommended to back up the database to prevent data loss.
Oracle's Role in the Business World
Apr 23, 2025 am 12:01 AM
Oracle is not only a database company, but also a leader in cloud computing and ERP systems. 1. Oracle provides comprehensive solutions from database to cloud services and ERP systems. 2. OracleCloud challenges AWS and Azure, providing IaaS, PaaS and SaaS services. 3. Oracle's ERP systems such as E-BusinessSuite and FusionApplications help enterprises optimize operations.
MySQL vs. Other Databases: Comparing the Options
Apr 15, 2025 am 12:08 AM
MySQL is suitable for web applications and content management systems and is popular for its open source, high performance and ease of use. 1) Compared with PostgreSQL, MySQL performs better in simple queries and high concurrent read operations. 2) Compared with Oracle, MySQL is more popular among small and medium-sized enterprises because of its open source and low cost. 3) Compared with Microsoft SQL Server, MySQL is more suitable for cross-platform applications. 4) Unlike MongoDB, MySQL is more suitable for structured data and transaction processing.
How to stop oracle database
Apr 12, 2025 am 06:12 AM
To stop an Oracle database, perform the following steps: 1. Connect to the database; 2. Shutdown immediately; 3. Shutdown abort completely.
