1、使用lambda進行查詢。
QueryWrapper<Student> queryWrapper = new QueryWrapper<>();
queryWrapper.lambda().eq(Student::getName, "小小");
List<Student> studentList = list(queryWrapper);
for (Student student : studentList){
Console.info(student);
}
2、條件查詢
1、多eq
QueryWrapper<Student> queryWrapper = new QueryWrapper<>();
queryWrapper.lambda()
.eq(Student::getName, "西夏")
.eq(Student::getAge, 26);
List<Student> studentList = list(queryWrapper);
for (Student student : studentList)
Console.info(new Gson().toJson(student));
2、or
QueryWrapper<Student> queryWrapper = new QueryWrapper<>();
queryWrapper.lambda()
.or(obj1 -> obj1.eq(Student::getName, "西夏"))
.or(obj2 -> obj2.eq(Student::getName, "1"));
List<Student> studentList = list(queryWrapper);
for (Student student : studentList)
Console.info(new Gson().toJson(student));
條件構造器
查詢方式 說明
setSqlSelect 設置 SELECT 查詢字段
where WHERE 語句,拼接 + WHERE 條件
and AND 語句,拼接 + AND 字段=值
andNew AND 語句,拼接 + AND (字段=值)
or OR 語句,拼接 + OR 字段=值
orNew OR 語句,拼接 + OR (字段=值)
eq 等於=
allEq 基於 map 內容等於=
ne 不等於<>
gt 大於>
ge 大於等於>=
lt 小於<
le 小於等於<=
like 模糊查詢 LIKE
notLike 模糊查詢 NOT LIKE
in IN 查詢
notIn NOT IN 查詢
isNull NULL 值查詢
isNotNull IS NOT NULL
groupBy 分組 GROUP BY
having HAVING 關鍵詞
orderBy 排序 ORDER BY
orderAsc ASC 排序 ORDER BY
orderDesc DESC 排序 ORDER BY
exists EXISTS 條件語句
notExists NOT EXISTS 條件語句
between BETWEEN 條件語句
notBetween NOT BETWEEN 條件語句
addFilter 自由拼接 SQL
last 拼接在最後,例如:last("LIMIT 1")