This module provide escape machinery for bytes and text types.

reference: http://dev.mysql.com/doc/refman/5.7/en/string-literals.html

• Escape Sequence Character Represented by Sequence
• 0 An ASCII NUL (X'00') character
• ' A single quote (“'”) character
• " A double quote (“"”) character
• b A backspace character
• n A newline (linefeed) character
• r A carriage return character
• t A tab character
• Z ASCII 26 (Control+Z); see note following the table
• \ A backslash (“”) character
• % A “%” character; see note following the table
• _ A “_” character; see note following the table

The % and _ sequences are used to search for literal instances of % and _ in pattern-matching contexts where they would otherwise be interpreted as wildcard characters, so we won't auto escape % or _ here.