public Object convertArgsToSqlCommandParam(Object[] args) {
 final int paramCount = params.size();
 if (args == null || paramCount == 0) {
 return null;
 } else if (!hasNamedParameters && paramCount == 1) {
 return args[params.keySet().iterator().next()];
 } else {
 final Map<String, Object> param = new ParamMap<Object>();
 int i = 0;
 for (Map.Entry<Integer, String> entry : params.entrySet()) {
 param.put(entry.getValue(), args[entry.getKey()]);
 // issue #71, add param names as param1, param2...but ensure backward compatibility
 final String genericParamName = "param" + String.valueOf(i + 1);
 if (!param.containsKey(genericParamName)) {
 param.put(genericParamName, args[entry.getKey()]);
 }
 i++;
 }
 return param;
 }
}

List<User> select(@Param('sex')String sex,Integer age);

{
 0:'sex',
 1:'1'
}

Object param = method.convertArgsToSqlCommandParam(args);
result = sqlSession.<E>selectList(command.getName(), param);

private Object wrapCollection(final Object object) {
 if (object instanceof Collection) {
 StrictMap<Object> map = new StrictMap<Object>();
 map.put("collection", object);
 if (object instanceof List) {
 map.put("list", object);
 }
 return map; 
 } else if (object != null && object.getClass().isArray()) {
 StrictMap<Object> map = new StrictMap<Object>();
 map.put("array", object);
 return map;
 }
 return object;
}

public DynamicContext(Configuration configuration, Object parameterObject) {
 if (parameterObject != null && !(parameterObject instanceof Map)) {
 MetaObject metaObject = configuration.newMetaObject(parameterObject);
 bindings = new ContextMap(metaObject);
 } else {
 bindings = new ContextMap(null);
 }
 bindings.put(PARAMETER_OBJECT_KEY, parameterObject);
 bindings.put(DATABASE_ID_KEY, configuration.getDatabaseId());
}

static class ContextMap extends HashMap<String, Object> {
 private MetaObject parameterMetaObject;
 public ContextMap(MetaObject parameterMetaObject) {
 this.parameterMetaObject = parameterMetaObject;
 }
 public Object get(Object key) {
 String strKey = (String) key;
 if (super.containsKey(strKey)) {
 return super.get(strKey);
 }
 if (parameterMetaObject != null) {
 // issue #61 do not modify the context when reading
 return parameterMetaObject.getValue(strKey);
 }
 return null;
 }
}

bindings.put(PARAMETER_OBJECT_KEY, parameterObject);
bindings.put(DATABASE_ID_KEY, configuration.getDatabaseId());

public static final String PARAMETER_OBJECT_KEY = "_parameter";
public static final String DATABASE_ID_KEY = "_databaseId";

static {
 OgnlRuntime.setPropertyAccessor(ContextMap.class, new ContextAccessor());
}

@Override
public Object getProperty(Map context, Object target, Object name)
 throws OgnlException {
 Map map = (Map) target;

 Object result = map.get(name);
 if (map.containsKey(name) || result != null) {
 return result;
 }

 Object parameterObject = map.get(PARAMETER_OBJECT_KEY);
 if (parameterObject instanceof Map) {
 return ((Map)parameterObject).get(name);
 }

 return null;
}

throw new BindingException("Parameter '" + key + "' not found. Available parameters are " + keySet());

MetaObject metaObject = configuration.newMetaObject(parameterObject);
bindings = new ContextMap(metaObject);

public Object get(Object key) {
String strKey = (String) key;
if (super.containsKey(strKey)) {
 return super.get(strKey);
}
if (parameterMetaObject != null) {
 return parameterMetaObject.getValue(strKey);
}
return null;
}

return parameterMetaObject.getValue(strKey)

throw new ReflectionException("Could not get property '" + prop.getName() + "' from " + object.getClass() + ". Cause: " + t.toString(), t);

@Override
public String handleToken(String content) {
 Object parameter = context.getBindings().get("_parameter");
 if (parameter == null) {
 context.getBindings().put("value", null);
 } else if (SimpleTypeRegistry.isSimpleType(parameter.getClass())) {
 context.getBindings().put("value", parameter);
 }
 Object value = OgnlCache.getValue(content, context.getBindings());
 String srtValue = (value == null ? "" : String.valueOf(value)); // issue #274 return "" instead of "null"
 checkInjection(srtValue);
 return srtValue;
}

<select id="selectOrderby" resultType="User">
select * from user order by ${value}
</select>

Object value = OgnlCache.getValue(content, context.getBindings());
String srtValue = (value == null ? "" : String.valueOf(value));

package com.abel533.mybatis;
public interface Code{
 public static final String ENABLE = "1";
 public static final String DISABLE = "0";
}

<select id="selectUser" resultType="User">
 select * from user where enable = ${@com.abel533.mybatis.Code@ENABLE}
</select>

public void setParameters(PreparedStatement ps) throws SQLException {
 ErrorContext.instance().activity("setting parameters").object(mappedStatement.getParameterMap().getId());
 List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
 if (parameterMappings != null) {
 for (int i = 0; i < parameterMappings.size(); i++) {
  ParameterMapping parameterMapping = parameterMappings.get(i);
  if (parameterMapping.getMode() != ParameterMode.OUT) {
  Object value;
  String propertyName = parameterMapping.getProperty();
  if (boundSql.hasAdditionalParameter(propertyName)) { // issue #448 ask first for additional params
   value = boundSql.getAdditionalParameter(propertyName);
  } else if (parameterObject == null) {
   value = null;
  } else if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
   value = parameterObject;
  } else {
   MetaObject metaObject = configuration.newMetaObject(parameterObject);
   value = metaObject.getValue(propertyName);
  }
  TypeHandler typeHandler = parameterMapping.getTypeHandler();
  JdbcType jdbcType = parameterMapping.getJdbcType();
  if (value == null && jdbcType == null) {
   jdbcType = configuration.getJdbcTypeForNull();
  }
  typeHandler.setParameter(ps, i + 1, value, jdbcType);
  }
 }
 }
}

if (boundSql.hasAdditionalParameter(propertyName)) { // issue #448 ask first for additional params
 value = boundSql.getAdditionalParameter(propertyName);
} else if (parameterObject == null) {
 value = null;
} else if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
 value = parameterObject;
} else {
 MetaObject metaObject = configuration.newMetaObject(parameterObject);
 value = metaObject.getValue(propertyName);
}

private static String itemizeItem(String item, int i) {
return new StringBuilder(ITEM_PREFIX).append(item).append("_").append(i).toString();
}

__frch_user_0,__frch_user_1,__frch_user_2…

<insert id="insertUserList">
 INSERT INTO user(username,password)
 VALUES
 <foreach collection="userList" item="user" separator=",">
 (#{user.username},#{user.password})
 </foreach>
</insert>

int insertUserList(@Param("userList")List<User> list);

Map<String, Object> bindings = context.getBindings();
final Iterable<?> iterable = evaluator.evaluateIterable(collectionExpression, bindings);

{
 "_parameter":{
 "param1":list,
 "userList":list
 },
 "_databaseId":null,
}

public Iterable<?> evaluateIterable(String expression, Object parameterObject) {
 Object value = OgnlCache.getValue(expression, parameterObject);
 if (value == null) {
  throw new BuilderException("The expression '" + expression + "' evaluated to a null value.");
 }
 if (value instanceof Iterable) {
  return (Iterable<?>) value;
 }
 if (value.getClass().isArray()) {
  int size = Array.getLength(value);
  List<Object> answer = new ArrayList<Object>();
  for (int i = 0; i < size; i++) {
   Object o = Array.get(value, i);
   answer.add(o);
  }
  return answer;
 }
 if (value instanceof Map) {
  return ((Map) value).entrySet();
 }
 throw new BuilderException("Error evaluating expression '" + expression + "'. Return value (" + value + ") was not iterable.");
}

Object value = OgnlCache.getValue(expression, parameterObject);

if (o instanceof Map.Entry) {
 @SuppressWarnings("unchecked") 
 Map.Entry<Object, Object> mapEntry = (Map.Entry<Object, Object>) o;
 applyIndex(context, mapEntry.getKey(), uniqueNumber);
 applyItem(context, mapEntry.getValue(), uniqueNumber);
} else {
 applyIndex(context, i, uniqueNumber);
 applyItem(context, o, uniqueNumber);
}