java通过JDBC访问Oracle的2个异常

1. 连接非常慢, 连接成功后执行select操作出现异常:

Exception in thread "main" Java.sql.SQLException: ORA-00600: 内部错误代码，参数: [ttcgcshnd-1], [0], [], [], [], [], [], []

解决: 使用Oracle安装目录下的jdbc\lib\classes12.jar后正常.

2. 使用PreparedStatement的setString(i, s)时出现:

可以参考帖子:http://community.csdn.net/EXPert/topic/3936/3936672.XML?temp=.2879145

java.sql.SQLException: 数据大小超出此类型的最大值: 3000

后面那个值大小不定, 感觉与s大小有关

表结构

create table test(

name char(32),

addr varchar(3000) //varchar2也一样

)

解决办法: 采用setCharacterStream

import java.sql.*;import java.io.*;import java.util.*;

/** * oracle测试 * @author kingfish * @version 1.0 */public class TestOra { public static void testORACLE() { String url = "jdbc:oracle:thin:@localhost:1521:oradb"; String username = "system"; String passWord = "manager";

Connection conn = null; try { Class.forName("oracle.jdbc.driver.OracleDriver"); conn = DriverManager.getConnection(url, username, password); } catch (Exception e) { e.printStackTrace(); return; }

char[] carray = new char[1000]; Arrays.fill(carray, '我'); String s = new String(carray); try { PreparedStatement pst = conn.prepareStatement( "insert into test(name,addr) values(?,?)"); pst.setString(1, "kingfish");

pst.setCharacterStream(2, new InputStreamReader(new ByteArrayInputStream(s. getBytes())), s.length());

//pst.setString(2,s); //用此句则异常 pst.execute();

Statement st = conn.createStatement(); ResultSet r = st.executeQuery("SELECT * from test");

while (r.next()) { s = r.getString(2); System.out.println("len=" + s.length()); System.out.println("value=" + s); }

r.close(); st.close(); conn.close(); } catch (Exception e) { e.printStackTrace(); } }

/** * 测试 * @param args String[] */ public static void main(String[] args) { testORACLE(); }}

说明: 引起此问题的原因估计和OraclePreparedStatement中的setString的实现有关.

kingfish

2005.4.14