注意除了 find 的前綴之外，我們查看 PartTree 的源碼，還有如下幾種前綴：

private static final String QUERY_PATTERN = "find|read|get|query|stream"; private static final String COUNT_PATTERN = "count"; private static final String EXISTS_PATTERN = "exists"; private static final String DELETE_PATTERN = "delete|remove";

使用的時候要配合不同的返回結果進行使用，例如：

interface UserRepository extends CrudRepository<User, Long> {long countByLastname(String lastname);//查詢總數long deleteByLastname(String lastname);//根據一個字段進行刪除操作List<User> removeByLastname(String lastname); }

大家也可以通過 Intellij IDEA ：Edit -> Find -> Find In Path 工具查找到關鍵字對應的枚舉在哪個類里面，如下：

?所以在這里作者介紹一工作中的小技巧，直接查看源碼就可以知道框架支持了哪些關鍵字。

Type 枚舉的關鍵源碼如下：

public static enum Type {BETWEEN(2, new String[]{"IsBetween", "Between"}),IS_NOT_NULL(0, new String[]{"IsNotNull", "NotNull"}),IS_NULL(0, new String[]{"IsNull", "Null"}),LESS_THAN(new String[]{"IsLessThan", "LessThan"}),LESS_THAN_EQUAL(new String[]{"IsLessThanEqual", "LessThanEqual"}),GREATER_THAN(new String[]{"IsGreaterThan", "GreaterThan"}),GREATER_THAN_EQUAL(new String[]{"IsGreaterThanEqual", "GreaterThanEqual"}),BEFORE(new String[]{"IsBefore", "Before"}),AFTER(new String[]{"IsAfter", "After"}),NOT_LIKE(new String[]{"IsNotLike", "NotLike"}),LIKE(new String[]{"IsLike", "Like"}),STARTING_WITH(new String[]{"IsStartingWith", "StartingWith", "StartsWith"}),ENDING_WITH(new String[]{"IsEndingWith", "EndingWith", "EndsWith"}),IS_NOT_EMPTY(0, new String[]{"IsNotEmpty", "NotEmpty"}),IS_EMPTY(0, new String[]{"IsEmpty", "Empty"}),NOT_CONTAINING(new String[]{"IsNotContaining", "NotContaining", "NotContains"}),CONTAINING(new String[]{"IsContaining", "Containing", "Contains"}),NOT_IN(new String[]{"IsNotIn", "NotIn"}),IN(new String[]{"IsIn", "In"}),NEAR(new String[]{"IsNear", "Near"}),WITHIN(new String[]{"IsWithin", "Within"}),REGEX(new String[]{"MatchesRegex", "Matches", "Regex"}),EXISTS(0, new String[]{"Exists"}),TRUE(0, new String[]{"IsTrue", "True"}),FALSE(0, new String[]{"IsFalse", "False"}),NEGATING_SIMPLE_PROPERTY(new String[]{"IsNot", "Not"}),SIMPLE_PROPERTY(new String[]{"Is", "Equals"}); ....}

總結

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