oracle数据库CLOB类型怎么转换为String

Posted 2023-03-04

oracle数据库中的字段类型是CLOB，而JavaBean中定义的字段是String，在java中往外读取数据的时候，打印的数据时类似于内存地址值一样的字符串，请问怎么转换啊？

给你段参考代码，读取clob数据

import java.io.InputStream;
import java.io.Reader;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;

public class TestClobOut
public static void main(String args[])
String data;
Reader inStream=null;
//获得数据库连接
Connection con = ConnectionFactory.getConnection();//ConnectionFactory类是另外定义的，不必纠结
con.setAutoCommit(false);
Statement st = con.createStatement();
//不需要“for update”
ResultSet rs = st.executeQuery("select CLOBATTR from TESTCLOB where ID=1");
if (rs.next())

java.sql.Clob clob = rs.getClob("CLOBATTR");
inStream = clob.getCharacterStream();
char[] c = new char[(int) clob.length()];
inStream.read(c);
//data是读出并需要返回的数据，类型是String
data = new String(c);
inStream.close();

inStream.close();
con.commit();
con.close();

参考技术A

给你段参考代码，读取clob数据

import java.io.InputStream;
import java.io.Reader;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
public class TestClobOut
public static void main(String args[])
String data;
Reader inStream=null;
//获得数据库连接

Connection con = ConnectionFactory.getConnection();//ConnectionFactory类是另外定义的，不必纠结
con.setAutoCommit(false);
Statement st = con.createStatement();
//不需要“for update”
ResultSet rs = st.executeQuery("select CLOBATTR from TESTCLOB where ID=1");
if (rs.next())
clob 转换 String (传入 clob 类型的 obj 对象)
public static String getClob2String(Object obj)
String str = "";
try
CLOB clob = (CLOB) obj;
if (clob == null || clob.length() == 0)
str = "";
else
long clen = clob.length();
char clobArray[] = new char[(int) clen];
int readednum = clob.getChars(1, (int) clen, clobArray);
StringBuffer sb = new StringBuffer();
sb.append(clobArray);
str = sb.toString();

catch (SQLException e)
e.printStackTrace();

return str;

java.sql.Clob clob = rs.getClob("CLOBATTR");
inStream = clob.getCharacterStream();
char[] c = new char[(int) clob.length()];
inStream.read(c);
//data是读出并需要返回的数据，类型是String
data = new String(c);
inStream.close();

inStream.close();
con.commit();
con.close();