JDBC连接Oracle的简单例子

杨洋洋 — Mon, 08 Jun 2009 05:00:00 GMT

最近在学习数据库，无意中找到个连接Oracle的简单的例子，稍微修改了下。特此记录：

1import java.sql.*;
2import java.util.logging.Level;
3import java.util.logging.Logger;
4
5/**
6 * Title: JDBC连接数据库
7 * Description: 本实例演示如何使用JDBC连接Oracle数据库，并演示添加数据和查询数据.
8 */
9public class JDBCExample {
10
11    public static void main(String[] arg) {
12        try {
13            try {
14                //注册JDBC驱动
15                Class.forName("oracle.jdbc.driver.OracleDriver");
16            } catch (ClassNotFoundException ex) {
17                Logger.getLogger(JDBCExample.class.getName()).log(Level.SEVERE, null, ex);
18            }
19            //创建数据库连接
20            String url = "jdbc:oracle:thin:@127.0.0.1:1521:NEW";
21            String username = "scott";
22            String password = "tiger";
23            Connection con = null;
24            try {
25                con = DriverManager.getConnection(url, username, password);
26            } catch (SQLException ex) {
27                Logger.getLogger(JDBCExample.class.getName()).log(Level.SEVERE, null, ex);
28            }
29            Statement statement = null;
30            try {
31                statement = con.createStatement();
32            } catch (SQLException ex) {
33                Logger.getLogger(JDBCExample.class.getName()).log(Level.SEVERE, null, ex);
34            }
35            ResultSet result;
36            //创建表
37            System.out.println("--Creating Tables--");
38            statement.executeUpdate("CREATE TABLE Person(name VARCHAR2(100) PRIMARY KEY,age INTEGER,live_in VARCHAR2(100) )");
39            //插入记录
40            System.out.println("--Inserting Data--");
41            statement.executeUpdate("INSERT INTO Person (name, age, live_in) VALUES('Robert Bellamy',24,'England')");
42            statement.executeUpdate("INSERT INTO Person (name, age, live_in) VALUES ('Grayham Downer',null,'Africa')");
43            statement.executeUpdate("INSERT INTO Person (name, age, live_in) VALUES ('Timothy French',24,'Africa')");
44            statement.executeUpdate("INSERT INTO Person (name, age, live_in) VALUES ('Butch Fad',53,'USA')");
45            statement.executeUpdate("INSERT INTO Person (name, age, live_in) VALUES ('Judith Brown',34,'Africa')");
46            // 查询
47            System.out.println("--SQL queries--");
48            result = statement.executeQuery("SELECT AVG(age) FROM Person");
49            if (result.next()) {
50                System.out.println("AV.age: " + result.getDouble(1));
51            }
52            System.out.println();
53            result = statement.executeQuery("SELECT name FROM Person WHERE live_in = 'Africa'");
54            System.out.println("All people that live in Africa:");
55            while (result.next()) {
56                System.out.println("  " + result.getString(1));
57            }
58            //删除表
59            statement.execute("DROP TABLE Person");
60            statement.close();
61            con.close();
62        } catch (SQLException ex) {
63            Logger.getLogger(JDBCExample.class.getName()).log(Level.SEVERE, null, ex);
64        }
65    }
66}

发现几个问题：
1.这里任何的SQL语句必须去掉分号，若有分号则会提示java.sql.SQLException: ORA-00911: invalid character的错误。
2.插入语句不能用逗号隔开的形式。如：INSERT INTO Person (name, age, live_in) VALUES ('Butch Fad',53,'USA')， ('Judith Brown',34,'Africa')，"INSERT INTO Person (name, age, live_in) VALUES ('Grayham Downer',null,'Africa')"。
3.NetBeans 6.5里面导入连接Oracle驱动的jar包的步骤是在项目窗口中右键点击“库”，选择添加库将oracle中自带的classes12.jar导入。

杨洋洋 2009-06-08 13:00 发表评论

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JDBC连接Oracle的简单例子