JDBC连接Oracle小技巧
1import java.math.BigDecimal;
2import java.sql.Connection;
3import java.sql.DriverManager;
4import java.sql.ResultSet;
5import java.sql.ResultSetMetaData;
6import java.sql.SQLException;
7import java.sql.Statement;
8import java.util.ArrayList;
9import java.util.Iterator;
10import java.util.List;
11
12public class newJdbc {
13 private String url = "jdbc:oracle:thin:@localhost:1521:nitpro";
14
15 private String dbUserName = "scott";
16
17 private String dbUserPassword = "tiger";
18
19 private Connection conn = null;
20
21 private Statement stmt = null;
22
23 private ResultSet rs = null;
24
25 public newJdbc() {
26 try {
27 Class.forName("oracle.jdbc.driver.OracleDriver");
28 } catch (ClassNotFoundException e) {
29 e.printStackTrace();
30 }
31 }
32
33 public Connection getConnection() {
34 try {
35 conn = DriverManager.getConnection(url, dbUserName, dbUserPassword);
36 } catch (SQLException e) {
37 e.printStackTrace();
38 }
39 return conn;
40 }
41
42 public void close(ResultSet rs, Statement stmt, Connection conn) {
43 if (rs != null) {
44 try {
45 rs.close();
46 } catch (SQLException e) {
47 e.printStackTrace();
48 }
49 }
50 if (stmt != null) {
51 try {
52 stmt.close();
53 } catch (SQLException e) {
54 e.printStackTrace();
55 }
56 }
57 if (conn != null) {
58 try {
59 conn.close();
60 } catch (SQLException e) {
61 e.printStackTrace();
62 }
63 }
64 }
65
66 public List query(String sql) {
67 List list = new ArrayList();
68
69 conn = this.getConnection();
70 try {
71 stmt = conn.createStatement();
72 rs = stmt.executeQuery(sql);
73 //获取数据库表结构
74 ResultSetMetaData rsm = rs.getMetaData();
75 //取得数据库的列数
76 int col = rsm.getColumnCount();
77 //生成col长度的Object数组
78 Object[] obj = new Object[col];
79 //遍历结果集,将结果存入Object数组
80 while (rs.next()) {
81 for (int i = 0; i < col; i++) {
82 obj[i] = rs.getObject(i + 1);
83 }
84 list.add(obj);
85 }
86 } catch (SQLException e) {
87 e.printStackTrace();
88 } finally {
89 this.close(rs, stmt, conn);
90 }
91 return list;
92 }
93
94 public void update(String sql) {
95 try {
96 conn = this.getConnection();
97 stmt = conn.createStatement();
98 stmt.executeUpdate(sql);
99 } catch (SQLException e) {
100 e.printStackTrace();
101 }
102 }
103
104 public static void main(String args[]) {
105 newJdbc nj = new newJdbc();
106 String sql = "select * from users";
107 List list = nj.query(sql);
108 //返回list的迭代器
109 Iterator it = list.iterator();
110 //遍历迭代器,取出结果
111 while (it.hasNext()) {
112 Object[] o = (Object[]) it.next();
113 int id = ((BigDecimal) o[0]).intValue();
114 System.out.println(id);
115 }
116
117 }
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