org.xerial.db
Class Relation

java.lang.Object
  org.xerial.db.Relation

public class Relation
extends Object

A Relation holds one or more DataTypes and denotes their relationships. For example, in relational databases, a table has a structure, e.g. (pid:integer, name:string, address:string) You can construct this structure as follows: Relation r = new Relation(); r.add("pid", new IntegerType()); r.add("name", new StringType()); r.add("address", new StringType()); JSON format example. {"relation":[["id", "integer"], ["name", "string"], ...]}

Author:

leo

Constructor Summary

Relation()

Relation(JSONObject jsonObj)

Relation(String jsonStr)

Method Summary

void	add(DataType dataType)
DataType	getDataType(int index)
static DataType	getDataType(String parameterName, String typeName)
int	getDataTypeIndex(String parameterName)
List<DataType>	getDataTypeList()
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Relation

public Relation()

Relation

public Relation(String jsonStr)
         throws JSONException

Throws:

JSONException

Relation

public Relation(JSONObject jsonObj)
         throws JSONException

Throws:

JSONException

Method Detail

getDataType

public static DataType getDataType(String parameterName,
                                   String typeName)

add

public void add(DataType dataType)

getDataType

public DataType getDataType(int index)

getDataTypeIndex

public int getDataTypeIndex(String parameterName)

getDataTypeList

public List<DataType> getDataTypeList()

toString

public String toString()

Overrides:

toString in class Object