select * from pdpla_approve_proj; create or replace procedure proj_xml(st_id varchar2) is pro_rows pdpla_approve_proj%rowtype;--行游标 tempsql varchar2(100) :='select * from pdpla_approve_proj where st_id='''||st_id||'''';-- type cur is re
select * from pdpla_approve_proj;
create or replace procedure proj_xml(st_id varchar2)
is
pro_rows pdpla_approve_proj%rowtype;--行游标
tempsql varchar2(100) :='select * from pdpla_approve_proj where st_id='''||st_id||'''';--
type cur is ref cursor;--自定义游标
proj_cur cur ;--自定义游标实例
doc xmldom.DOMDocument := xmldom.newDOMDocument;--文档对象
doc_node xmldom.DOMNode := xmldom.makeNode(doc);--文档节点
root_ele xmldom.DOMElement := xmldom.createElement(doc,'root');--文档根元素
st_pro_ele xmldom.DOMElement;
project_ele xmldom.DOMElement;
st_pro_node xmldom.DOMNode;
root_node xmldom.DOMNode;
project_node xmldom.DOMNode;
t_node xmldom.DOMNode;
cnt number :=1;
buf varchar2(1000);
begin
dbms_output.put_line('tempsql'||tempsql);
root_node := xmldom.appendChild(doc_node,xmldom.makeNode(root_ele));
xmldom.setAttribute(root_ele,'id',st_id);
open proj_cur for tempsql;--打开游标
loop
fetch proj_cur into pro_rows;
exit when proj_cur%notfound;
project_ele := xmldom.createElement(doc,'project');
project_node := xmldom.appendChild(root_node,xmldom.makeNode(project_ele));
st_pro_ele := xmldom.createElement(doc,'st_pro_id');
st_pro_node := xmldom.appendChild(project_node,xmldom.makeNode(st_pro_ele));
t_node := xmldom.appendChild(st_pro_node,xmldom.makeNode(xmldom.createTextNode(doc,pro_rows.st_project_id)));
st_pro_ele := xmldom.createElement(doc,'st_info_type');
st_pro_node := xmldom.appendChild(project_node,xmldom.makeNode(st_pro_ele));
t_node := xmldom.appendChild(st_pro_node,xmldom.makeNode(xmldom.createTextNode(doc,pro_rows.st_info_type)));
cnt :=cnt+1;
end loop;
close proj_cur;
xmldom.writeToBuffer(doc,buf);
xmldom.freeDocument(doc);
dbms_output.put_line('cnt'||cnt);
dbms_output.put_line('doc'||buf);
exception
when others then
dbms_output.put_line('sqlerrm'||sqlerrm);
end;
create or replace procedure p_parse (ID in varchar2) is--创建xml解析器实例xmlparser.ParserxmlPar xmlparser.Parser :=xmlparser.newParser;--定义DOM文档xDoc xmldom.DOMDocument;--定义DATA子节点数目变量lenItme integer;--定义节点列表,存放DATA节点们itemNodes xmldom.DOMNodeList;--定义节点列表,,存放DATA子节点们childNodes xmldom.DOMNodeList;--定义节点,存放单个DATA节点itemNode xmldom.DOMNode;--定义属性变量,存放节点属性itemArrMap xmldom.DOMNamedNodeMap;--定义其他变量,存放子节点的值name varchar(100);value varchar(100);newid NUMBER(10);--定义clob变量,存放xml字符串para_namexmlStr clob;begin for cur in (select t.xml_data para_name ,t.id from xmldata t where t.id=ID ) --从xmldata表中查询数据,id不是唯一标识,一个id可查出多条数据(XML中多条数据),故用loop循环 loop --获取para_name中的xml字符串 xmlStr:=cur.para_name; xmlPar :=xmlparser.newParser; --解析xmlStr中xml字符串,并存放到xmlPar中 xmlparser.parseClob(xmlPar, xmlStr); --将xmlPar中的数据转存到dom文档中 xDoc:=xmlparser.getDocument(xmlPar); xmlparser.freeParser(xmlPar); --释放解析器实例 --获取所有DATA节点 itemNodes:=xmldom.getElementsByTagName(xDoc,'DATA'); --获取DATA节点的个数 lenItme :=xmldom.getLength(itemNodes); --遍历所有的DATA节点 for i in 0..lenItme-1 loop begin --获取节点列表中的第i个DATA节点 itemNode:=xmldom.item(itemNodes,i); --获取第i个DATA节点的所有子节点 childNodes:=xmldom.getChildNodes(itemNode); --获取所有子节点的值 newid:=xmldom.getNodeValue(xmldom.getFirstChild(xmldom.item(childNodes,0))); name:=xmldom.getNodeValue(xmldom.getFirstChild(xmldom.item(childNodes,1))); value:=xmldom.getNodeValue(xmldom.getFirstChild(xmldom.item(childNodes,2))); --将子节点的值newid,name,value存放到xmltest insert into xmltest values(newid,name,value); commit; end; end loop; end loop; --是否dom文档 xmldom.freeDocument(xDoc); --异常和错误处理 EXCEPTION WHEN OTHERS THEN DBMS_output.PUT_LINE(SQLERRM);end p_parse;

InnoDBBufferPool reduces disk I/O by caching data and indexing pages, improving database performance. Its working principle includes: 1. Data reading: Read data from BufferPool; 2. Data writing: After modifying the data, write to BufferPool and refresh it to disk regularly; 3. Cache management: Use the LRU algorithm to manage cache pages; 4. Reading mechanism: Load adjacent data pages in advance. By sizing the BufferPool and using multiple instances, database performance can be optimized.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

MySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA


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