本文整理汇总了Java中javax.persistence.criteria.CriteriaBuilder.isNull方法的典型用法代码示例。如果您正苦于以下问题：Java CriteriaBuilder.isNull方法的具体用法？Java CriteriaBuilder.isNull怎么用？Java CriteriaBuilder.isNull使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类javax.persistence.criteria.CriteriaBuilder的用法示例。
在下文中一共展示了CriteriaBuilder.isNull方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: buildJpaPredicate
import javax.persistence.criteria.CriteriaBuilder; //导入方法依赖的package包/类
@Override
public Predicate buildJpaPredicate(CriteriaBuilder cb, Root<?> root) {
Expression<?> path = QueryFormHelper.getPath(root,field);
return cb.isNull(path);
}
示例2: toPredicate
import javax.persistence.criteria.CriteriaBuilder; //导入方法依赖的package包/类
@Override
public Predicate toPredicate(final Root<?> root, final CriteriaQuery<?> query, final CriteriaBuilder cb) {
return cb.isNull(PredicateBuilderUtil.getPath(root, naam));
}
示例3: toPredicate
import javax.persistence.criteria.CriteriaBuilder; //导入方法依赖的package包/类
@SuppressWarnings({ "rawtypes", "unchecked" })
public Predicate toPredicate(Root<?> root, CriteriaQuery<?> query, CriteriaBuilder builder) {
Path expression = null;
if (fieldName.contains(".")) {
System.out.println(root);
String[] names = StringUtils.split(fieldName, ".");
expression = root.get(names[0]);
for (int i = 1; i < names.length; i++) {
expression = expression.get(names[i]);
}
} else {
expression = root.get(fieldName);
}
switch (operator) {
case EQ:
return builder.equal(expression, value);
case NE:
return builder.notEqual(expression, value);
case LIKE:
return builder.like((Expression<String>) expression, "%" + value + "%");
case RLIKE:
return builder.like((Expression<String>) expression, value + "%");
case LLIKE:
return builder.like((Expression<String>) expression, value + "%");
case LT:
return builder.lessThan(expression, (Comparable) value);
case GT:
return builder.greaterThan(expression, (Comparable) value);
case LTE:
return builder.lessThanOrEqualTo(expression, (Comparable) value);
case GTE:
return builder.greaterThanOrEqualTo(expression, (Comparable) value);
case ISNULL:
return builder.isNull(expression);
case NOTNULL:
return builder.isNotNull(expression);
default:
return null;
}
}