postgresql - Parse string as json array from Postgre -


i have table in postgresql 2 columns - id , coord. column "coord" - geo coordinates stored string in json format.

example: 

[{"lat":49.09693425316379,"lng":33.61747393628419},{"lat":49.11835977646441,"lng":33.638456496907},{"lat":49.12103137811804,"lng":33.63866144845382},{"lat":49.09694682809236,"lng":33.61746879914138},{"lat":49.08920750204137,"lng":33.61734796797724},{"lat":49.07643862058337,"lng":33.61246117651179}]

how send such string json array of objects(post request).

entity without getters , setters 

public class lepcoord implements serializable {  private static final long serialversionuid = 1l; @id @basic(optional = false) @notnull @size(min = 1, max = 30) @column(name = "tplnr") private string tplnr; @size(max = 2147483647) @column(name = "coord") private string coord;

controller

@post @requestmapping(value= "/lep/{voltage}", method = requestmethod.post, headers = "accept=application/json") @responsebody public responseentity<list<lepcoord>> lep (@pathvariable  string voltage)  {     return new responseentity<>(gisdaoservice.lep(voltage), httpstatus.ok); }

and service

 @transactional(readonly = true)     public list <lepcoord> lep (string voltage) {          query  query = this.em.createquery(                  " lepcoord ");        list <lepcoord> rez = null;         try {                 rez = (list<lepcoord>) query.getresultlist();             } catch (persistenceexception r) {                 return null;             }             return rez;         }

hibernate cant handle json type if storeing coord json in postgre. may knows easier way. not write own classes work postgres json type

you using hibernate use custom usertype knows how handle json.

  1. create hibernate usertype

    public class geojsontype implements usertype  {      protected static final int[] sql_types = { java.sql.types.varchar };      @override     public int[] sqltypes()     {         return sql_types;     }      @override     public class returnedclass()     {         return geoentity.class;     }      @override     public boolean equals(object x, object y) throws hibernateexception     {         if (x == y)         {             return true;         }         else if (x == null || y == null)         {             return false;         }         else         {             return x.equals(y);         }     }      @override     public int hashcode(object x) throws hibernateexception     {         return x.hashcode();     }      @override     public object nullsafeget(resultset rs, string[] names, object owner)     throws hibernateexception, sqlexception      {  //        if (rs.wasnull()) //        { //            return null; //        }      //this json stored in db          string rsarr = rs.getstring(names[0]);          if (rsarr == null)             return null;                 geoentity detailattr = json.toobject(rsarr, geoentity.class, null);         return detailattr;     }      @override     public void nullsafeset(preparedstatement st, object value, int index) throws hibernateexception, sqlexception     {         if (value == null)         {             st.setnull(index, sql_types[0]);         }         else         {             //when stroing object db convert json             geoentity castobject = (geoentity) value;             string json = json.tojson(castobject);             st.setstring(index, json);         }     }      @override     public object deepcopy(object value) throws hibernateexception     {         return value;     }      @override     public boolean ismutable()     {         return true;     }      @override     public serializable disassemble(object value) throws hibernateexception     {         return null;     }      @override     public object assemble(serializable cached, object owner) throws hibernateexception     {         return null;     }      @override     public object replace(object original, object target, object owner) throws hibernateexception     {         return original;     }  }

  2. your entity.java

    @type(type = "fqn geojsontype")

    @column(name = "geo")

    public geoentity getgeo()

    {

    return geo;

    }


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