Special Character escaping and wildcards of SQLite

Source: Internet
Author: User

1. escape characters in sqlikte

Select * from table where number like '%/%' escape '/'

    When the sqlite3 database is searching, some special characters need to be escaped,The escape is as follows:
     /  ->   //
     '  ->   ''
     [  ->   /[
     ]  ->   /]
     %  ->   /%
     &  ->   /&
     _  ->   /_
     (  ->   /(
     )  ->   /)Note that special characters do not use the Backslash "\" to indicate escape characters.

public static String sqliteEscape(String keyWord){
    keyWord = keyWord.replace("/", "//");
    keyWord = keyWord.replace("'", "''");
    keyWord = keyWord.replace("[", "/[");
    keyWord = keyWord.replace("]", "/]");
    keyWord = keyWord.replace("%", "/%");
    keyWord = keyWord.replace("&","/&");
    keyWord = keyWord.replace("_", "/_");
    keyWord = keyWord.replace("(", "/(");
    keyWord = keyWord.replace(")", "/)");
    return keyWord;
}

2. wildcards that indicate a single character and any multiple characters in SQL statements

%
Any string that contains zero or multiple characters.
Where title like '% Computer %' searches for all titles containing the word "computer" anywhere in the title.

_ (Underline)
Any single character.
Where au_fname like '_ EAN' searches for the names of all four letters ending with EAN (such as dean and Sean ).

[]
Specifies any single character in the range ([a-f]) or set ([abcdef.
Where au_lname like '[C-P] Arsen' will look for the author's surname that ends with arsen and starts with any single character between C and P, such as Carsen, Larsen, Karsen, etc.

[^]
It does not belong to any single character in the specified range ([a-f]) or set ([abcdef.
Where au_lname like 'de [^ L] %' searches for the last names of all authors whose names start with De and whose subsequent letters are not l.


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