freepeople性欧美熟妇, 色戒完整版无删减158分钟hd, 无码精品国产vα在线观看DVD, 丰满少妇伦精品无码专区在线观看,艾栗栗与纹身男宾馆3p50分钟,国产AV片在线观看,黑人与美女高潮,18岁女RAPPERDISSSUBS,国产手机在机看影片

正文內(nèi)容

計(jì)算機(jī)專業(yè)畢業(yè)設(shè)計(jì)外文翻譯--jdbc接口技術(shù)(完整版)

2025-07-10 17:37上一頁面

下一頁面
  

【正文】 database connectivity is more easily Now. It is also constructed at the same time highlevel API and database development tools. Highlevel API and database development tools should be more friendly user interface, the use of more side Then, more easily understandable. However, all this API will eventually be translated into JDBC such as the bottom of API. At present, two highlevel API based on JDBC is in development stage Paragraph. 1) SQL language embedded Java preprocessor. While the DBMS has achieved the SQL query, but the JDBC requirements of SQL statements as a string parameter transmitted to the Java way Sequence. The embedded SQL preprocessor allows a programmer to mix SQL statements: Java variables can be used in SQL statements to receive or provide the value. And the preSQL This processor will be Java / SQL mix procedures translated into the Java program with JDBCAPI. 2) implementation from the relational database to the Java type of direct mapping. Javasoft and other panies have announced plans to achieve this technology. At this object / relational Mapping table of each line will bee an example of this type, each column corresponds to the value of a property instance. Java programmers can directly operate the object。而且,在許多情況下,三層模型可以提供更好的性能。這就需要能直接被訪問的數(shù)據(jù)庫進(jìn)行連接的 JDBC 驅(qū)動(dòng)器。 JDBC 保持了 ODBC 的基本設(shè)計(jì)特征。因此,對(duì) Java 程序員來說,把 JDBC 設(shè)想成將 ODBC 轉(zhuǎn)換成面向?qū)ο蟮?API 是很自然的。同時(shí),程序員也正在開發(fā)對(duì)最終用戶來說訪問數(shù)據(jù)庫更加容易的應(yīng)用程序。然后 SQL 的預(yù)處理器將把這種Java/ SQL 混用的程序翻譯成帶有 JDBCAPI 的 Java 程序。 JDBC 完全勝任這個(gè)任務(wù),而且比其他數(shù)據(jù)庫互聯(lián)更加容易實(shí)現(xiàn)?;蛘咂髽I(yè)可以通過 JDBC 讓全部的職工(他們可以使用不同的操作系統(tǒng),如 Windwos, Machintosh 和 UNIX)在 Intra 上連接到幾個(gè)全球數(shù)據(jù)庫上,而這幾個(gè)全球數(shù)據(jù)庫可以是不相同的。 JDBC 給數(shù)據(jù)庫應(yīng)用開發(fā)人員、數(shù)據(jù)庫前臺(tái)工具開發(fā)人員提供了一種標(biāo)準(zhǔn)的應(yīng)用程序設(shè)計(jì)接口,使開發(fā) 人員可以用純 Java 語言編寫完整的數(shù)據(jù)庫應(yīng)用程序。出現(xiàn)大量的用 java 語言編寫的程序,其中也包括數(shù)據(jù)庫應(yīng)用程序。 驅(qū)動(dòng)器管理器:為應(yīng)用程序裝載數(shù)據(jù)庫驅(qū)動(dòng)器。它由一些 Java 語言編寫的類和界面組成。通 過ODBCAPI,應(yīng)用程序可以存取保存在多種不同數(shù)據(jù)庫管理系統(tǒng)( DBMS)中的數(shù)據(jù),而不論每個(gè) DBMS 使用了何種數(shù)據(jù)存儲(chǔ)格式和編程接口。因此當(dāng)應(yīng)用系統(tǒng)發(fā)出調(diào)用與數(shù)據(jù)源進(jìn)行連接時(shí),數(shù)據(jù)庫驅(qū)動(dòng)器能管理通信協(xié)議。在 JDK1. x版本中, JDBC 只是一個(gè)可選部件,到了 JDK1. 1 公布時(shí), SQL 類包(也就是 JDBCAPI)山西大學(xué)本科畢業(yè)論文(設(shè)計(jì))外文翻譯資料 就成為 Java 語言的標(biāo)準(zhǔn)部件。 Java 和 JDBC 的結(jié)合可以讓開發(fā)人員在開發(fā)數(shù)據(jù)庫應(yīng)用時(shí) 真正實(shí)現(xiàn)“ WriteOnce, RunEverywhere!” Java 具有健壯、安全、易用等特性,而且支持自動(dòng)網(wǎng)上下載,本質(zhì)上是一種很好的數(shù)據(jù)庫應(yīng)用的編程語言。對(duì)于信息服務(wù)行業(yè), Java 和 JDBC 提供了一種很好的向外界用戶更新信息的方法。 1) SQL 語言嵌入 Java 的預(yù)處理器。還可以實(shí)現(xiàn)更加復(fù)雜的映射,比如多張表的行在一個(gè) Java 的類中實(shí)現(xiàn)。 ODBC 是一個(gè) C 語言實(shí)現(xiàn)的 API,從 Java 程序調(diào)用本地的 C 程序會(huì)帶來一系列類似安全性、完整性、健壯性的缺點(diǎn)。如 果 JDBC 驅(qū)動(dòng)器是完全用 Java 語言實(shí)現(xiàn)的話,那么 JDBC 的代碼就可以自動(dòng)的下載和安裝,并保證其安全性,而且,這將適應(yīng)任何Java 平臺(tái),從網(wǎng)絡(luò)計(jì)算機(jī) NC 到大型主機(jī) Mainframe。然而,這些接口目前并不能代替 ODBC,尤其在 ODBC 驅(qū)動(dòng)器已經(jīng)在市場(chǎng)完全形成的時(shí)候,更重要的是它們只是 ODBC 的“漂亮的包裝”。 如圖所示,在三層模型中,命令將被發(fā)送到服務(wù)的“中間層”,而“中間層”將 SQL語句發(fā)送到數(shù)據(jù)庫。s SQLServer. Writing with JDBC procedures can automatically SQL Statement sent to the appropriate database management system (DBMS). Not only that, the use of Java applications can be prepared at any support running on Java platform, not Must in the preparation of different platforms on different applications. The bination of Java and JDBC allows developers to develop database applications really achieve WriteOnce, RunEverywhere! Java has a robust, secure, easytouse and other characteristics, but also support the automatic downloading, in essence, is a good database application programming language. It needs Java application is how to work with various database connection, JDBC is the key to achieve this connection. JDBC expanded the ability of Java, such as the use of Java and JDBCAPI can 山西大學(xué)本科畢業(yè)論文(設(shè)計(jì))外文翻譯資料 publish a Web page, page with access to remote databases Ap plet. Either Enterprises through JDBC to allow all the workers (who can use different operating systems, such as Windwos, Machintosh and UNIX) at In tra up to connect to the On a number of global databases, which can be several global databases are not identical. As more and more developers use Java language,
點(diǎn)擊復(fù)制文檔內(nèi)容
畢業(yè)設(shè)計(jì)相關(guān)推薦
文庫吧 www.dybbs8.com
備案圖鄂ICP備17016276號(hào)-1