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A collection of Hibernate mappings I got from https://github.com/jamesward/spring_hibernate_hstore_demo and https://hibernate.atlassian.net/browse/HB-450

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package net.backtothefront;


import org.springframework.util.StringUtils;

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

// courtesy of: http://backtothefront.net/2011/storing-sets-keyvalue-pairs-single-db-column-hibernate-postgresql-hstore-type/
public class HstoreHelper {

    private static final String K_V_SEPARATOR = "=>";

    public static String toString(Map m) {
        if (m.isEmpty()) {
            return "";
        }
        StringBuilder sb = new StringBuilder();
        int n = m.size();
        for (String key : m.keySet()) {
            sb.append("\"" + key + "\"" + K_V_SEPARATOR + "\"" + m.get(key) + "\"");
            if (n > 1) {
                sb.append(", ");
                n--;
            }
        }
        return sb.toString();
    }

    public static Map toMap(String s) {
        Map m = new HashMap();
        if (! StringUtils.hasText(s)) {
            return m;
        }
        String[] tokens = s.split(", ");
        for (String token : tokens) {
            String[] kv = token.split(K_V_SEPARATOR);
            String k = kv[0];
            k = k.trim().substring(1, k.length() - 1);
            String v = kv[1];
            v = v.trim().substring(1, v.length() - 1);
            m.put(k, v);
        }
        return m;
    }
}