如何使用JDBC程序连接到Derby数据库?
ApacheDerby是一个关系数据库管理系统,它完全基于Java编程语言(以Java编程语言编写/实现)。它是由ApacheSoftwareFoundation开发的开源数据库。
安装derby:
请按照下面给出的步骤安装derby:
访问ApacheDerby主页https://db.apache.org/derby/的主页。单击下载选项卡。
选择并单击最新版本的ApacheDerby的链接。
单击所选链接后,您将被重定向到apachederby的“分发”页面。如果您在此处观察到,则derby提供的发行版分别是db-derby-bin,db-derbylib.zip,db-derby-lib-debug.zip和db-derby-src.zip。
下载db-derby-bin文件夹。将其内容复制到要安装ApacheDerby的单独文件夹中。(例如,说C:\Derby)
现在,要与Derby合作,
通过传递Java安装文件夹中bin文件夹的位置,确保已设置JAVA_HOME变量,并将JAVA_HOME/bin包含在PATH变量中。
创建一个新的环境变量DERBY_HOME,其值为C:\Derby。
db-derby-bin发行版的bin文件夹(我们将其更改为C:\Derby\bin)包含所有必需的jar文件。
示例
接下来的JDBC程序建立与Apachederby数据库的连接,创建一个名为employeedata的表,在其中插入记录,检索并显示表的内容。
public class InsertData { public static void main(String args[]) throws Exception { //注册驱动程序 Class.forName("org.apache.derby.jdbc.EmbeddedDriver"); //获取连接对象 String URL = "jdbc:derby:mydatabs;create=true"; Connection conn = DriverManager.getConnection(URL); //创建Statement对象 Statement stmt = conn.createStatement(); //在Derby数据库中创建表 String query = "CREATE TABLE EmployeeData( " + "Id INT NOT NULL GENERATED ALWAYS AS IDENTITY, " + "Name VARCHAR(255), " + "Salary INT NOT NULL, " + "Location VARCHAR(255), " + "PRIMARY KEY (Id))"; stmt.execute(query); System.out.println("Table created"); //插入数据 query = "INSERT INTO EmployeeData(" + "Name, Salary, Location) VALUES " + "('Amit', 30000, 'Hyderabad'), " + "('Kalyan', 40000, 'Vishakhapatnam'), " + "('Renuka', 50000, 'Delhi'), " + "('Archana', 15000, 'Mumbai'), " + "('Trupthi', 45000, 'Kochin'), " + "('Suchatra', 33000, 'Pune'), " + "('Rahul', 39000, 'Lucknow'), " + "('Trupthi', 45000, 'Kochin')"; stmt.execute(query); System.out.println("Values inserted"); //检索数据 ResultSet rs = stmt.executeQuery("Select * from EmployeeData"); System.out.println("表EmployeeData表的内容:"); while(rs.next()) { System.out.print("ID: "+rs.getInt("ID")+", "); System.out.print("Name: "+rs.getString("Name")+", "); System.out.print("Salary: "+rs.getInt("Salary")+", "); System.out.print("Location: "+rs.getString("Location")); System.out.println(); } } }
输出结果
Table created Values inserted 表EmployeeData表的内容: ID: 1, Name: Amit, Salary: 30000, Location: Hyderabad ID: 2, Name: Kalyan, Salary: 40000, Location: Vishakhapatnam ID: 3, Name: Renuka, Salary: 50000, Location: Delhi ID: 4, Name: Archana, Salary: 15000, Location: Mumbai ID: 5, Name: Trupthi, Salary: 45000, Location: Kochin ID: 6, Name: Suchatra, Salary: 33000, Location: Pune ID: 7, Name: Rahul, Salary: 39000, Location: Lucknow ID: 8, Name: Trupthi, Salary: 45000, Location: Kochin