Ofbiz project-based learning - phased Summary

First, the assembly parameters of learning

The first is the query, the query conditions, the need to determine whether a null value passed from the front? - how to deal with inquiries null values?

A determination may of course be one of, but this leads to a lot of code that can be unitary, a common method.

1, a single process by:

　　Sentenced to call the utility method empty (bottom: determine whether it is null and empty)

/ ** UtilValidate class. * /

/** Check whether string s is NOT empty. */
public static boolean isNotEmpty(String s) {
return (s != null) && s.length() > 0;
}

/** Check whether collection c is NOT empty. */
public static <E> boolean isNotEmpty(Collection<E> c) {
return (c != null) && !c.isEmpty();
}

/** Check whether charsequence c is NOT empty. */
public static <E> boolean isNotEmpty(CharSequence c) {
return ((c != null) && (c.length() > 0));
}

        if (UtilValidate.isNotEmpty(startDate)) {
            condList.add(EntityCondition.makeCondition(PackagePrepayFields.REPAY_APP_DATE,
                    EntityOperator.GREATER_THAN_EQUAL_TO,
                    startDate));
        }

1, page

1.1 Service (Method name) corresponds to XML

　　To the Senate

<attribute name="viewSize" type="Integer" mode="IN"  optional="true" description="条数" />
<attribute name="viewIndex" type="Integer" mode="IN"  optional="true" description="页码" />

　　A reference

< Attribute name = "the returnCode" type = "the Map" MODE = "OUT" optional = "to true" Description = "normal return state data" /> 
< attribute name = "totalSize" type = "Integer" MODE = "OUT"   optional = "to true" Description = "returns the total number of"  /> <- Note here that the case of the parameters ->

1.2 Java code output

result.put("list", pagedList.getData());
result.put("totalSize", pagedList.getSize());

2, EntityQuery learning

// 带分页参数
PagedList<GenericValue> pagedList = EntityQuery.use(delegator)
                    .select(columns) 
                    .from(PackagePrepayFields.COM_MESSAGE_INFO_TEXT_THREE)
                    .where(condList)
                    .cursorScrollInsensitive()
                    .queryPagedList(viewIndex - 1, viewSize);
// 不带分页
List<GenericValue> list =EntityQuery.use(delegator)

                    .select(columns) 
                    .from(PackagePrepayFields.COM_MESSAGE_INFO_TEXT_THREE)
                    .where(condList)
                    .queryList();

Ofbiz project-based learning - phased Summary

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