【通用条件:】
【比较大小: ( =, <>, >, >=, <, <= )】

  eq(R column, Object val); // 等价于 =,例: eq("name", "老王") ---> name = '老王'
    ne(R column, Object val); // 等价于 <>,例: ne("name", "老王") ---> name <> '老王'
    gt(R column, Object val); // 等价于 >,例: gt("name", "老王") ---> name > '老王'
    ge(R column, Object val); // 等价于 >=,例: ge("name", "老王") ---> name >= '老王'
    lt(R column, Object val); // 等价于 <,例: lt("name", "老王") ---> name < '老王'
    le(R column, Object val); // 等价于 <=,例: le("name", "老王") ---> name <= '老王'

【范围:(between、not between、in、not in)】

   between(R column, Object val1, Object val2); // 等价于 between a and b, 例:             between("age", 18, 30) ---> age between 18 and 30
   notBetween(R column, Object val1, Object val2); // 等价于 not between a and b, 例:     notBetween("age", 18, 30) ---> age not between 18 and 30
   in(R column, Object... values); // 等价于 字段 IN (v0, v1, ...),例: in("age",{1,2,3}) ---> age in (1,2,3)
   notIn(R column, Object... values); // 等价于 字段 NOT IN (v0, v1, ...), 例: notIn("age",{1,2,3}) ---> age not in (1,2,3)
   inSql(R column, Object... values); // 等价于 字段 IN (sql 语句), 例: inSql("id", "select id from table where id < 3") ---> id in (select id from table where id < 3)
   notInSql(R column, Object... values); // 等价于 字段 NOT IN (sql 语句)

【模糊匹配:(like)】

  like(R column, Object val); // 等价于 LIKE '%值%',例: like("name", "王") ---> name like '%王%'
    notLike(R column, Object val); // 等价于 NOT LIKE '%值%',例: notLike("name", "王") ---> name not like '%王%'
    likeLeft(R column, Object val); // 等价于 LIKE '%值',例: likeLeft("name", "王") ---> name like '%王'
    likeRight(R column, Object val); // 等价于 LIKE '值%',例: likeRight("name", "王") ---> name like '王%'

【空值比较:(isNull、isNotNull)】

    isNull(R column); // 等价于 IS NULL,例: isNull("name") ---> name is null
    isNotNull(R column); // 等价于 IS NOT NULL,例: isNotNull("name") ---> name is not null

【分组、排序:(group、having、order)】

    groupBy(R... columns); // 等价于 GROUP BY 字段, ..., 例: groupBy("id", "name") ---> group by id,name
    orderByAsc(R... columns); // 等价于 ORDER BY 字段, ... ASC, 例: orderByAsc("id", "name") ---> order by id ASC,name ASC
    orderByDesc(R... columns); // 等价于 ORDER BY 字段, ... DESC, 例: orderByDesc("id", "name") ---> order by id DESC,name DESC
    having(String sqlHaving, Object... params); // 等价于 HAVING ( sql语句 ), 例: having("sum(age) > {0}", 11) ---> having sum(age) > 11

【拼接、嵌套 sql:(or、and、nested、apply)】

   or(); // 等价于 a or b, 例:eq("id",1).or().eq("name","老王") ---> id = 1 or name = '老王'
   or(Consumer<Param> consumer); // 等价于 or(a or/and b),or 嵌套。例: or(i -> i.eq("name", "李白").ne("status", "活着")) ---> or (name = '李白' and status <> '活着')
   and(Consumer<Param> consumer); // 等价于 and(a or/and b),and 嵌套。例: and(i -> i.eq("name", "李白").ne("status", "活着")) ---> and (name = '李白' and status <> '活着')
   nested(Consumer<Param> consumer); // 等价于 (a or/and b),普通嵌套。例: nested(i -> i.eq("name", "李白").ne("status", "活着")) ---> (name = '李白' and status <> '活着')
   apply(String applySql, Object... params); // 拼接sql(若不使用 params 参数,可能存在 sql 注入),例: apply("date_format(dateColumn,'%Y-%m-%d') = {0}", "2008-08-08") ---> date_format(dateColumn,'%Y-%m-%d') = '2008-08-08'")
   last(String lastSql); // 无视优化规则直接拼接到 sql 的最后,可能存若在 sql 注入。
   exists(String existsSql); // 拼接 exists 语句。例: exists("select id from table where age = 1") ---> exists (select id from table where age = 1)

【QueryWrapper 条件:】

    select(String... sqlSelect); // 用于定义需要返回的字段。例: select("id", "name", "age") ---> select id, name, age
    select(Predicate<TableFieldInfo> predicate); // Lambda 表达式,过滤需要的字段。
    lambda(); // 返回一个 LambdaQueryWrapper

【UpdateWrapper 条件:】

  set(String column, Object val); // 用于设置 set 字段值。例: set("name", null) ---> set name = null
    etSql(String sql); // 用于设置 set 字段值。例: setSql("name = '老李头'") ---> set name = '老李头'
    lambda(); // 返回一个 LambdaUpdateWrapper 

文档更新时间: 2023-11-27 13:33   作者:admin