import java.util.HashMap;
import java.util.Map;

/**
 * User: pdc738 Date: 06.22, 2010 Time: 3:36:20 PM 
 * To Encoder special character.
 * If you want to insert binary data into a string column (such as a BLOB column), the following characters must be represented by escape sequences. 
       NUL NUL byte (0x00). Represent this character by “\0” (a backslash followed by an ASCII “0” character). 
       \ Backslash (ASCII 92). Represent this character by “\\”. 
       ' Single quote (ASCII 39). Represent this character by “\'”. 
       " Double quote (ASCII 34). Represent this character by “\"”.  
 * Within a string, certain sequences have special meaning unless the NO_BACKSLASH_ESCAPES SQL mode is enabled. Each of these sequences begins with
   a backslash (“\”), known as the escape character. MySQL recognizes the following escape sequences in referencesMap
 */

public class MYSQLEncoder {
	
    private static Map<String,String> referencesMap = new HashMap<String,String>();

    static{
        referencesMap.put("'","\\'");
        referencesMap.put("\"","\\\"");
        referencesMap.put("\\","\\\\");
        
        referencesMap.put("\n","\\\n");
        referencesMap.put("\0","\\\0");
        referencesMap.put("\b","\\\b");
        referencesMap.put("\r","\\\r");
        referencesMap.put("\t","\\\t");
        referencesMap.put("\f","\\\f");
    }
    
    //escape sql tag with the source code.
	public static String encode(String source) {
		if (source == null)
			return "";
		
		StringBuffer sbuffer = new StringBuffer(source.length());
		
		for (int i = 0; i < source.length(); i++) {
			String c = source.substring(i,i+1);
			
			//System.out.println("c=" + c);
			//System.out.println(referencesMap.get(c));
			
			if (referencesMap.get(c) != null) {
				sbuffer.append(referencesMap.get(c));
			} else {
				sbuffer.append(c);
			}
		}
		return sbuffer.toString();
	}
	
	public static void main(String[] args){
		String tt = encode("They'are \"ok\". \\a");
		System.out.print(tt);
	}
}

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