Chapter 9 Java and SQL. Wang Yang

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1 Chapter 9 Java and SQL Wang Yang

2 Outline Concern Data - File & IO vs. Database &SQL Database & SQL How Connect Java to SQL - Java Model for Database Java Database Connectivity (JDBC) - API

3 Concern Data File & IO vs. Database & SQL

4 Review of File & IO Experiment : Write Student Information into File 姓 名 学 号 成 绩 张 小 灵 李 小 乐 We can use two methods OutputStream Writer

5 Review of File & IO OutputStream e5 bc a0 e5 b0 8f e7 81 b5 04 3c ea ad e6 9d 8e e5 b0 8f e4 b c ea ae a

6 Review of File & IO But if we want to change content read all the record change the specific record write all the record back rewrite All the record just for one record change

7 Review of File & IO We can use RandomAccessFile use seek() to specific position override the record change 张 小 灵 score to 91

8 Review of File & IO But if we want to change record length change 张 小 灵 name to 张 灵 what we get is 张 灵? e5 bc a0 e7 81 b5 e7 81 b c ea ad

9 Review of File & IO If multiple people want to modify the file at the same time we must use synchronization the process If Someone insert wrong data, like -1 for score we must write code to insure it will not be written if we want to use another language we must learn different data type and process

10 What we concern is Data We only want write Student Information into a table like excel, can easily manipulate the data we only concern data, not the media, : binaryfile, TextFile, CSVFile, Excel, not the process OutputStream, Writer, RandomAccessFile, not the programming language Java, C, C++,

11 What we concern is Data We want to create a table struct to describe data 姓 名 : String:2 ~10 Character 学 号 : String :7Character,All Numeric 成 绩 : Int : 0 ~100

12 What we concern is Data we want to manipulate data insert data record update data record delete data record query data record

13 What we concern is Data We want there are a common system to store data Database we want to learn only a common language to process it - SQL

14 Database & SQL

15 Basic Concepts in Database Database and DBMS RDBMS ( 关 系 型 数 据 库 管 理 系 统 ) Store data in rows and columns Rows called Record ( 记 录 ), and columns called Field ( 字 段 ) A set of rows and columns are called Table ( 表 ) A table usually represents an Entity ( 实 体 ) There are Relations ( 关 系 ) between Entities, ER Map Query through SQL( 结 构 化 查 询 语 言)

16 Basic Concepts in Database Application Users Application Programs Database Management System (DBMS) System Users database

17 Basic Concepts in Database Usual RDBMS MySQL / PostgreSQL / Berkeley DB Oracle SQL Server DB2

18 Basic Concepts in Database

19 Basic Concepts in SQL Structured Query Language SQL including DDL Data Definition Language These queries are used to create database objects such as tables, indexes, procedures, constraints Create, drop, alter,truncate,comment,rename DML Data Manipulation Language These queries are used to manipulate the data in the database tables. Insert, update, delete, select (more available) DCL Data Control Language These are data control queries like grant and revoke permissions

20 CRUD Operations in SQL CRUD means Create, Read, Update, Delete Create : create the table and insert data into table Read : select data from table Update : update data in the table Delete : delete data from the table

21 Create Statement Data Query! result create table Course ( StudentName varchar(10), StudentID char(7), CourseName varchar(10), score integer, primary key (studentid));

22 Insert Statement Data! ColumnName StudentName StudentID Score DataType varchar(10) char(7) int Query! INSERT into Course (StudentName, StudentID, Score) VALUES ( 张 小 灵, , 91) ; result

23 Insert Statement First assign which fields you want to insert you can just insert one field or two fields other fields will be null or default value Then you give values for the fields String must be quoted don t use Chinese or Chinese ()

24 Select Statement Data! Query! SELECT StudentName, Score FROM Course; Result

25 Select Where Condition Data! Query SELECT StudentName, Score FROM Course! Where Score > 90; Result

26 Select Where Combined Condition Data! Query SELECT StudentName, Score FROM Course! Where Score > 90 and StudentID < ; Result

27 Select Where In Data! Query SELECT StudentName, Score FROM Course! Where StudentName in ( 张 小 灵, 李 小 乐 ); Result

28 Select Where Between Data! Query! SELECT StudentName, Score FROM Course Where SutdentID between and ; Result

29 Select Where Like Data! Query SELECT StudentName, Score FROM Course! Where StudentName Like 张 % ; Result

30 Select Where Order by Data! Query SELECT StudentName, Score FROM Course! Order by Score DESC; Result

31 Select Distinct Data! Query! SELECT Distinct(Score) FROM Course; Result

32 Select Where Count Data! Query! SELECT Count (Distinct(Score)) FROM Course; Result

33 Update Statement Data! Query UPDATE Course SET Score=95 Where! StudentID= ; Result

34 Delete Statement Data! Query! DELETE FROM Course Where Score>91; Result

35 TEST Write following SQL query Query for all coursename Query for the number of course with studentcnt > 50 Query for sales of stores with name containing 对 象, and rank the result descending according to sales Insert into table a new record (any record will do) Modify 面 向 对 象 程 序 设 计 1 课 程 的 studentcnt to 100 Delete all records related to 面 向 对 象

36 TEST

37 How Connect Java to SQL Java Model for Database

38 JDBC JDBC - Java Database Connectivity Provides API for database access JDBC Client JSP/Servlet JDBC DB Server Client App Server DB Server

39 JDBC Principle Java APPs JDBC API JDBC Driver Manager JDBC Driver JDBC Driver JDBC ODBC Sql Server Oracle MySQL

40 JDBC Principle Connection 2 Client 3 Statement ResultSet 4 DB Server DriverManager 1

41 Java Database Connectivity API

42 JDBC API Provider: Sun Package java.sql javax.sql Major Classes and Interfaces DriverManager Class Connection Interface Statement Interface ResultSet Interface

43 Establish a Connection import java.sql.*;! Load the vendor specific driver Class.forName("com.mysql.jdbc.Driver");! Dynamically loads a driver class, for Mysql database Make the connection String dburl = "jdbc:mysql://localhost:3306/" +!! "MyDB?user=your_username&password=your_password";! Connection connection = DriverManager.getConnection(dbURL);! Establishes connection to database by obtaining a Connection object

44 Create JDBC statement(s) String query = Select * From Course ;! Statement stmt = conn.createstatement() ; Creates a Statement object for sending SQL statements to the database

45 execute and get Result ResultSet rs = stmt.executequery(query);! while (rs.next()) {!! System.out.println(rs.getString("StudentName"));! } 张 小 灵! 李 小 乐! 王 小 天! 赵 小 宝

46 Close all the resource rs.close();! stmt.close();! conn.close();! release all the resources of ResultSet, Statement, and Connection

47 JDBC Process try{ // 加 载 及 注 册 JDBC 驱 动 程 序 Class.forName(...); // 创 建 JDBC 连 接 Connection connection =... // 创 建 Statement Statement statement =... // 创 建 查 询 并 处 理 查 询 结 果 ResultSet rs =... } catch (ClassNotFoundException e) {System.out.println(" 无 法 找 到 驱 动 类 ");} catch (SQLException e) {e.printstacktrace();} finally { try { rs.close(); statement.close(); connection.close(); } catch (Exception e) { e.printstacktrace();} }

48 Two Way of Executing Statement executeupdate For queries with no results returned, usually Insert \ Delete \ Update executequery For queries with results returned, usually Select

49 PreparedStatement Interface Derived from Statement interface For repeatedly executed SQL Usually for queries with no result, such as Insert \ Delete \ Update Together with addbatch() and executebatch()

50 PreparedStatement Interface

51 Reference W3C School SQL 教 程 SQL 语 句 教 程 JDBC Data Access API JDBC Technology Homepage JDBC Database Access The Java Tutorial JDBC Documentation

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