月归档：九月 2011

网友反馈blob插入一些字段报错，查询metalink，发现使用rawtohex处理即可，测试如下：

SQL> create table t_lob (t blob);

Table created.

SQL> insert into t_lob values('-------');
insert into t_lob values('-------')
                         *
ERROR at line 1:
ORA-01465: invalid hex number


SQL> insert into t_lob values(rawtohex('---------'));

1 row created.

SQL> insert into t_lob values('－－－－－－－－－－&');
insert into t_lob values('－－－－－－－－－－&')
                         *
ERROR at line 1:
ORA-01465: invalid hex number

SQL> insert into t_lob values(rawtohex('－－－－－－－－－－&'));

1 row created.

SQL> commit;

Commit complete.

网友提供java处理代码如下：

///插入
public void test()
	{
		conn=DBUtil.getActiveConnection();
		String sqlStr="Set define off";
		String ss="————";
		String sql="insert into test1(names,btestname) values('12',rawtohex('"+ss+"'))";
		System.out.println(sqlStr);
		System.out.println(sql);
		try {
			pstmt=conn.prepareStatement(sqlStr);
			pstmt.addBatch();  
			
			pstmt=conn.prepareStatement(sql);
			pstmt.addBatch();
			pstmt.executeBatch();
			
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		finally
		{
			DBUtil.closeStatement(pstmt);
			DBUtil.closeConnection(conn);
		}
	}

／／／／查询语句
public void getTest()
	{
		conn=DBUtil.getActiveConnection();
		String sql="select * from test1 where names='12'";
		//oracle.sql.BLOB blob = null;
		InputStream inStream=null;
		
		try {
			pstmt=conn.prepareStatement(sql);
			set=pstmt.executeQuery();
			if(set!=null && set.next())
			{
				//接收blob类型
				java.sql.Blob blob = (oracle.sql.BLOB)set.getBlob("btestname");
				//注意
				inStream = blob.getBinaryStream();
		        if(blob!=null) System.out.println("有值＝＝＝＝＝＝＝＝＝＝＝＝");
				try {
					byte[] data = new byte[200];
						
					 int length=0;//每次读取的实际字节长度
						//is.read()方法：从buff缓中区的第0个位开始读取字节，每次最多读取200，
						//方法会返回一个实际读取的长度，用length接收，当值为-1时，表示所有的字节全部读取完毕
					 while((length=inStream.read(data,0,200))!=-1)
					{
						//把字节以平台的默认编码方式转为字符，从buff的第0个位开始转换，实际要转换的长度是length
						String str=new String(data,0,length);	
						System.out.println("最终结果====  "+str+"  ====");
					}
	 
					//关闭流
					inStream.close();	
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}

			}	
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		finally
		{
			DBUtil.closeResultSet(set);
			DBUtil.closeStatement(pstmt);
			DBUtil.closeConnection(conn);
		}
	}