Warning : Readline library was not found. Line editor is disabled.

Solution：

1， check 

[root@localhost bin]# yum install readline
Loaded plugins: fastestmirror, refresh-packagekit, security
Setting up Install Process
Loading mirror speeds from cached hostfile
 * base: mirrors.cqu.edu.cn
 * extras: mirrors.opencas.cn
 * updates: mirror.lzu.edu.cn
Package readline-6.0-4.el6.x86_64 already installed and latest version
Nothing to do

2，yum search readline

Found ：readline-devel.x86_64 : Files needed to develop programs which use the
                      : readline library

3， install 

yum -y install -y  readline-devel.x86_64

xsql works normally.