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