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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
