postgresql数据库使用bytea类型字段

具体存储时使用的是postgresql自定义函数（存储过程）

函数如下：

create or replace function savepicture(xpicture varchar,xpicname varchar)

returns int as $$

begin

insert in temp_picture(picture,picturename) values(cast(xpicture as bytea),xpicname);

return 1;

end $$ language plpgsql;

部分代码处理

String picture= null;

byte[] data = null;
File file = new File(path);
FileInputStream input = null;
try {
input = new FileInputStream (file);
ByteArrayOutputStream output = new ByteArrayOutputStream();
byte[] buf = new byte[(int)file.length()];
int byteread = 0;
try {
while((byteread = input.read(buf))!=-1){
output.write(buf,byteread);
}
data = output.toByteArray();
picture= binarys(data);
output.close();
input.close();
} catch (IOException e) {
e.printStackTrace();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}catch (IOException e1) {
e1.printStackTrace();
}

public static String binarys(byte[] bytes){
StringBuffer sbf = new StringBuffer("");
for (int i = 0; i < bytes.length; i++) {
String tmp = Integer.toOctalString(bytes[i] & 0xff);
switch (tmp.length()) {
case 1:
tmp = "\\00" +tmp;
break;
case 2:
tmp = "\\0" +tmp;
break;
case 3:
tmp = "\\" +tmp;
break;
default:
break;
}
sbf.append(tmp);
}

return sbf.toString();
}

postgresql存储二进制数据需要转为3位八进制数据存储。