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JDBC (Java Data Base Connectivity) 是 Java 语言中用于连接关系数据库的 API，提供了统一的访问接口，允许开发者使用 Java 语言编写的应用程序与各种关系数据库进行交互。 JDBC 的主要功能是提供了一个标准的 API，用于访问各种关系数据库，包括 Oracle、Sybase、Informix 等。JDBC 使得开发者可以使用 Java 语言编写的应用程序与不同的数据库进行交互，而不需要为每个数据库编写专门的程序。同时，JDBC 也提供了一个 BRAND NAME，作为一个标准的 API，提供了一个统一的访问接口。 JDBC 的架构主要包括两个部分：Java 端和数据库端。Java 端包括 Java 应用程序和 JDBC.driver，用于将 Java 应用程序与数据库连接起来。数据库端则包括数据库服务器和 JDBC.driver，用于将数据库服务器与 Java 应用程序连接起来。 JDBC 的主要优点是提供了一个统一的访问接口，允许开发者使用 Java 语言编写的应用程序与各种关系数据库进行交互，同时也提供了一个 BRAND NAME，作为一个标准的 API。JDBC 的使用可以提高开发效率，降低开发成本，并且可以提高应用程序的可移植性。 JDBC 的主要组件包括： 1. JDBC.driver：是一个 Java 类库，提供了访问数据库的接口。 2. Connection：是一个 Java 对象，用于表示与数据库的连接。 3. Statement：是一个 Java 对象，用于执行 SQL 语句。 4. ResultSet：是一个 Java 对象，用于存储查询结果。 JDBC 的使用可以分为以下几个步骤： 1. 导入 JDBC.driver：首先需要导入 JDBC.driver，以便使用 JDBC 访问数据库。 2. 建立连接：使用 Connection 对象建立与数据库的连接。 3. 执行 SQL 语句：使用 Statement 对象执行 SQL 语句。 4. 处理结果：使用 ResultSet 对象处理查询结果。 JDBC 的优点包括： 1. 提高开发效率：JDBC 提供了一个统一的访问接口，允许开发者使用 Java 语言编写的应用程序与各种关系数据库进行交互。 2. 降低开发成本：JDBC 提供了一个标准的 API，降低了开发成本。 3. 提高应用程序的可移植性：JDBC 允许应用程序在不同的平台上运行。 4. 简化数据库访问：JDBC 提供了一个简单的访问接口，简化了数据库访问。 JDBC 的缺点包括： 1. 性能问题：JDBC 的性能可能不如直接访问数据库。 2. 安全问题：JDBC 的使用可能会带来安全问题。 JDBC 是一个功能强大且广泛使用的 API，提供了一个统一的访问接口，允许开发者使用 Java 语言编写的应用程序与各种关系数据库进行交互。

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JDBC (Java Data Base Connectivity)

JDBC (Java Data Base Connectivity,) is a SQL statement for the implementation of the

Java API, for a variety of relational databases to provide a unified visit by a group, it’s using

Java language preparation classes and interface. JDBC for tools / database development

provides a standard API, which can build more sophisticated tools and interfaces to database

developers. Pure Java API can be used to prepare database applications, at the same time,

JDBC is also a brand name. With JDBC, data sent to the various relationships SQL statement

is a very easy matter. In other words with JDBC API, we do not have to visit a Sybase

database to write specialized procedures, visit the Oracle database specifically to write a

program, or visit Informix database and the preparation of another procedure, programmers

should use the JDBC API to write a procedure enough, it can be sent to the corresponding

SQL database calls. Meanwhile, the Java language and JDBC to integrate non-programmers

do not have to, with a platform for the preparation of different applications, just write it again

in the process can be run on any platform, which is the Java language language once, run run

advantage. Java database Connect Architecture for Java application of the

standard method of connecting to the database. JDBC is the case of Java programmers API,

and the realization of the database connection is the case of service providers interface model.

As API, JDBC program development for the provision of standard interfaces, and

database vendors and third-party middleware vendors to achieve connectivity and database

provides a standard method. JDBC use the existing SQL standard - Support and other

databases and connectivity standards, such as bridge between ODBC. JDBC achieve all these

objectives and standards for a simple, high-performance and strict definition of achieving type

interface. Java with a solid, safe, easy to use, easy to understand and can be automatically

downloaded from the Internet and other characteristics of the preparation of the outstanding

database application language. Need is a Java application Database with a variety of different

procedures for a dialogue between the methods. The JDBC is the mechanism for such

purposes. Java JDBC expanded functionality. For example, with Java and JDBC API Applet

can be issued containing the page, and the applet may use the information from remote

databases enterprises can also use JDBC to all staff through the Intranet will be connected to

one or more Internal database (even if those staff computers are used by Windows, Macintosh,

and UNIX, and other various operating systems). As more and more programmers using Java

Programming language, Java from the convenient access to the database requirements are

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increasing. MIS administrators like the combination of Java and JDBC, because it makes it

easy to disseminate information and Economy. Enterprises can continue to use their installed

database, and can easily access information, even if this information is stored in the different

database management systems. The development of new procedures is a very short period. An

Equipment and version control will be greatly simplified. Programmers can prepare only what

applications or updated only once, and then put it on the server, and then on any person can

get the latest version of the application. Sales for the business information services, Java and

JDBC for external customers with better access to information update method.

First, the use of JDBC

Simply put, JDBC to do three things: establish a connection with the database, send SQL

statements and the results. The following codes are the basic examples: statements and the results. The following codes are the basic examples: statements and the results. The following codes are the basic examples:

Statement stmt = con.createStatement (); Statement stmt = con.createStatement ();

While (rs.next ()) { While (rs.next ()) { While (rs.next ()) { While (rs.next ()) {

Based on the above code JDBC database access to a summary of the classic, of course, in

this part of the follow-up section we will do a detailed analysis.

Second, JDBC API

it functions very good, and other than the easy-to-use database connectivity API, but it also

has been designed as a basis interface, it can be established on the High interface and tools.

High interface is is interface, which uses a more comprehensible and more

convenient API. This API is converted in the behind-the-scenes such as JDBC such a a

table corresponding to the category of an example, the value of each column the examples

should be an attribute. Therefore, programmers can directly operate on the Java objects; SQL

for data access call will be be the guise guise automatically generated. They can also be

more complex mapping, for example, a number of rows in the table integrated into a Java

class. With the interest of the people of JDBC the growing, and more and more developers

have been using JDBC-based tools So that the preparation process more easily. Programmers

has been trying to make in the preparation of end-user database access has become more

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simple applications. For example, applications can provide a choice of According to the

mandate of the menu. Task was chosen, the application will be given tips and blank selected

for the task of completing the implementation of the necessary information. Application

procedures for the importation of the required information will automatically call for SQL

Order. In such a process with the assistance, even if they do not understand the fundamental

SQL syntax, but also can perform database tasks.

Third, JDBC and ODBC compared with other API

Currently, Microsoft's ODBC API is the most widely used for the visit of the relational

database programming interface. It can connect almost all platforms almost all databases. For

What Java does not use ODBC? The answer to this question is: Java can use ODBC, but

preferably with the help of the JDBC to JDBC-ODBC Bridge in the form of use of this point, preferably with the help of the JDBC to JDBC-ODBC Bridge in the form of use of this point,

ODBC not suitable for direct use in Java, because it uses C language interface. Transferred

from Java C code in the local security, achieved solid and procedural aspects of the automatic

transplantation has many shortcomings. From ODBC C API Java API to the literal translation

is not advisable. For example, Java does not guide, and it has ODBC indicators used very

widely (including very error-prone Guidelines Guidelines Guidelines You can imagine JDBC will be

converted into the object-oriented interface to the ODBC, and the object-oriented interface to

make it easier for Java programmers to receive. ODBC is difficult to learn. It simple and

advanced features of the mix, and even the simple query, the options are extremely complex.

On the contrary, JDBC to guarantee simple function of simplicity, At the same time, if

necessary, to allow the use of advanced features. The opening of of of mechanism

needs such as JDBC Java API. If you use ODBC, it is necessary to manually will be ODBC

driver management and driver installation in each client machines. If completely written in

Java JDBC Driver in all the JDBC code on the Java platform (from the computer network to

the mainframe) can be Automatic installation, and guarantee the safety of transplantation.

In short, JDBC API for SQL abstract and basic concepts of Java is a natural interface. It

is built on ODBC rather than starting from scratch. Therefore, programmers will be familiar

with ODBC JDBC found very easy to use. ODBC JDBC retains the basic design features; In

fact, the two interfaces are based on the X / Open SQL CLI (call-level interface). Among

them the largest district, another is: Java JDBC to style and based on the merits and

optimization, more easy to use.

At present, Microsoft has introduced a new addition to ODBC API: RDO, ADO and

OLE DB. These design in many ways and JDBC is the same, that is, they are the

object-oriented Based on the database interface and can be achieved on ODBC in the category.

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