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

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

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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();
}
}

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