oracle|访问
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