Ofiz一些查询示例

Ofbiz架构讲解与讨论 http://wenku.baidu.com/view/b631f311f18583d049645903
 1. 创建记录  
Map planetValues = UtilMisc.toMap("planetId", "JUPITER", " planetName", "Jupiter"); 
GenericValue planetGV = delegator.makeValue("Planet", planetValues); planetGV.create(); 
 
UtilMisc是集合类操作的工具类,ofbiz优化了map,list,set。 GenericValue 对象是对应数据库中一条记录。  
以上代码等价于 
INSERT INTO Planet (planetId, planetName)  VALUES ("JUPITER", "Jupiter"). 
 
2. 更新记录  
Map planetValues = UtilMisc.toMap("planetId", "JUPITER"); 
GenericValue planetGV = delegator.findByPrimaryKey("Planet",planetValues); planetGV.put("planetName", "Joopiter"); planetGV.store();
 以上代码等价于 
UPDATE Planet  SET planetName = "Joopiter"  WHERE planetId = "JUPITER" 

3. 删除记录  
Map planetValues = UtilMisc.toMap("planetId", "JUPITER"); 
GenericValue planetGV = delegator.findByPrimaryKey("Planet",  planetValues); planetGV.remove(); 

以上代码等价于 
DELETE FROM Planet WHERE planetId = "JUPITER"  

4. 查询记录  
condition = new EntityExpr("planetId", EntityOperator.EQUALS, "EARTH"); data = delegator.findByCondition("Planet", condition, null, null);
 以上代码等价于 
SELECT * FROM Planet WHERE planetId = "EARTH" 其中 
EntityOperator 为ofbiz逻辑操作符号类。 
EQUALS NOT_EQUAL LESS_THAN GREATER_THAN 
LESS_THAN_EQUAL_TO (less than or equal to) GREATER_THAN_EQUAL_TO IN NOT_IN BETWEEN LIKE NOT_LIKE NOT  
findByCondition(entityName,condition,filedList,orderList)方法的四个参数。 
entityName:查询的实体名 
condition :查询条件 
filedList :实体属性列表 
orderList : 属性排序列表  
fields = UtilMisc.toList("planetId", "planetName"); 
data = delegator.findByCondition("Planet", condition, fields, null);
 以上代码等价于 
SELECT  plantetId,name  FROM  Planet  
fields = UtilMisc.toList("planetId DESC"); //fields = UtilMisc.toList("-planetId "); 
以上代码等价于 
SELECT * FROM Planet ORDER BY planetId DESC  

模糊查询 
condition = new EntityExpr("planetName", EntityOperator.LIKE,  "%AR%"); data = delegator.findByCondition("Planet", condition, null, null); 
以上代码等价于 
SELECT * FROM Planet WHERE planetName LIKE "%ar%"  

复合条件查询 
conditionList = UtilMisc.toList  
  (new EntityExpr("planetName", EntityOperator.LIKE, "%ar%"),     new EntityExpr("planetName", EntityOperator.LIKE, "%m%")); condition1 = new EntityConditionList(conditionList,   
                                     EntityOperator.OR); condition2 = new EntityConditionList  
  (UtilMisc.toList(new EntityExpr("planetName", EntityOperator.LIKE, "%s%"),      new EntityExpr("planetName", EntityOperator.LIKE, "%P%")),     EntityOperator.OR); 
combined = new EntityConditionList(UtilMisc.toList(condition1, condition2), EntityOperator.AND); data = delegator.findByCondition("Planet", combined, null, null); 
以上代码等价于 SELECT  * FROM  
Planet 
WHERE  
(planetName LIKE "%ar%" OR planetName LIKE "%t%") AND  
(planetName LIKE "%s%" OR planetName LIKE "%P%") 


Accessing the Entities and View Entities http://blog.csdn.net/ztk3939339/article/details/8781483
无条件遍历
使用如下代码即可:
findList(EntityName, null, null, null, null,false); 


条件遍历
需要先了解如下概念:
条件的表达
EntityWhereString - SQL语句描述,OFBiz的开发者强烈不建议使用这个,因为破坏了OFBiz的封装性
EntityExpr - 使用OFBiz封装好的操作符来描述一个条件,推荐使用,简单易懂。EntityExpr = 左值 + operator + 右值。我们使用EntityCondition.makeCondition()来生成EntityExpr
EntityOperator - 定义了条件中的操作符

EQUALS,NOT_EQUAL,LESS_THAN,GREATER_THAN,LESS_THAN_EQUAL_TO (less than or equal to),GREATER_THAN_EQUAL_TO - 用于数值的比较
condition = EntityCondition.makeCondition("planetId", EntityOperator.NOT_EQUAL,"EARTH");  


IN,NOT_IN - 规定遍历的结果的某个属性值需要在/不在某个集合中
condition = EntityCondition.makeCondition("planetId", EntityOperator.IN, UtilMisc.toList("EARTH", "PLUTO"));
 

LIKE,NOT_LIKE - 用于字符串匹配
condition = new EntityExpr("planetName", EntityOperator.LIKE, "%AR%");  

这里的意思是找出名字里面还有AR的所有planet
% - any number of characters
_ - any one character


EntityConditionList - 由多个EntityExpr连接来。 EntityConditionList = list_of(condition1,condition2,...) + EntityJoinOperator
conditionList = UtilMisc.toList(EntityCondition.makeCondition("planetName", EntityOperator.LIKE, "%ar%"),   
                    EntityCondition.makeCondition("planetName", EntityOperator.LIKE, "%t%"));  
conditions = EntityCondition.makeCondition(conditionList, EntityOperator.AND); 

EntityJoinOperator - 两个值AND和OR。其实它是继承EntityOperator得来的,所以使用EntityOperator.AND和EntityOperator.OR也行
public List<GenericValue> findList(String entityName, EntityCondition entityCondition, Set<String> fieldsToSelect, List<String> orderBy, EntityFindOptions findOptions, boolean useCache) - 返回查找的列表


entityName
entityCondition - 查找的条件,可以为EntityExpr,也可以为EntityConditionList,因为他们都是继承于EntityCondition的
fieldsToSelect - 结果中需要显示field,即选择要显示的列
orderBy - 结果的排序,排序的规则是:orders the retrieved records by those fields. If there is more than one field in the list, ordering is performed by the first field, then the second, and so on。默认是升序排列。如果要降序排列,可以这样:
order = UtilMisc.toList("planetId DESC");  

注意:此处planetId和DESC之间的空格有且只能有一个,多了少了都会出错,其他地方有多少个空格都无所谓

或者
order = UtilMisc.toList("-planetId");  

注意:-和planetId之间不能有空格,否则出错,其他地方空格随意
findOptions - 不常用,设为null
useCache - 不常用,设为false

单一条件查找
import org.ofbiz.base.util.*;  
import org.ofbiz.entity.*;  
import org.ofbiz.entity.condition.*;  
  
condition = EntityCondition.makeCondition("planetId", EntityOperator.IN,UtilMisc.toList("EARTH", "PLUTO"));  
data = delegator.findList("Planet", condition, null, null, null,false);  


多条件查找
import org.ofbiz.base.util.*; 
import org.ofbiz.entity.*; 
import org.ofbiz.entity.condition.*; 
 
conditionList = UtilMisc.toList(EntityCondition.makeCondition("planetName", EntityOperator.LIKE, "%ar%"),  
    EntityCondition.makeCondition("planetName", EntityOperator.LIKE, "%t%")); 
conditions = EntityCondition.makeCondition(conditionList, EntityOperator.AND); 
data = delegator.findList("Planet", conditions, null, null, null,false);


查找结果排序
import org.ofbiz.base.util.*;  
order = UtilMisc.toList("planetId DESC");  
data = delegator.findList("Planet", null, null, order, null, false);  


选择要结果中Field
import org.ofbiz.base.util.*;  
fields = UtilMisc.toSet("planetId", "planetName");  
data = delegator.findList("Planet", null, fields, null, null, false);  




分页
int listSize = 0;
				int lowIndex = 0;
				int highIndex = 0;
				int viewSize = 10;

				lowIndex = (Integer.parseInt(pagenumber) - 1) * viewSize + 1;
				highIndex = Integer.parseInt(pagenumber) * viewSize;

				List<GenericValue> list = null;
				String entityName = "SandbagUserTotalScoreProgramView";
				TransactionUtil.begin();
				EntityListIterator pli = null;
				Set<String> fieldToSet = FastSet.newInstance();
				List<String> orderBy = FastList.newInstance();
				orderBy.add("-score");

				EntityFindOptions findOpts = new EntityFindOptions();
				findOpts.setResultSetType(EntityFindOptions.TYPE_SCROLL_INSENSITIVE);
				findOpts.setMaxRows(15);
				List<EntityCondition> mainCondList = FastList.newInstance();
				if (UtilValidate.isNotEmpty(traineeId)) {
					mainCondList.add(EntityCondition.makeCondition("traineeId", EntityOperator.EQUALS, traineeId));
				}
				mainCondList.add(EntityCondition.makeCondition("fromType", EntityOperator.EQUALS, "program"));

				EntityCondition mainCond = EntityCondition.makeCondition(mainCondList, EntityOperator.AND);

				pli = delegator.find(entityName, mainCond, null, fieldToSet, orderBy, findOpts);
				if (lowIndex > 0 && viewSize > 0) {
					list = pli.getPartialList(lowIndex, viewSize);
				} else {
					list = pli.getCompleteList();
				}

				listSize = pli.getResultsSizeAfterPartialList();
				if (highIndex > listSize) {
					highIndex = listSize;
				}
				TransactionUtil.commit();

				success = "1";
				resultObj.put("rows", viewSize);
				resultObj.put("total", listSize);
				resultObj.put("pagecount", listSize % viewSize > 0 ? listSize / viewSize + 1 : listSize / viewSize);
				resultObj.put("data", parseViewDatList(list));
				resultObj.put("success", success);

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