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