mybatis-plus 使用Condition拼接Sql语句各方法的使用

1.setSqlSelect—用于添加查询的列信息

public Wrapper<T> setSqlSelect(String... columns) { StringBuilder builder = new StringBuilder(); String[] arr = columns; int len = columns.length; for(int i = 0; i$ < len; ++i$) { String column = arr$[i$]; if (StringUtils.isNotEmpty(column)) { if (builder.length() > 0) { builder.append(","); } builder.append(column); } } this.sqlSelect = builder.toString(); return this; }

2.eq—拼接等于的where语句 column=params

public Wrapper<T> eq(boolean condition, String column, Object params) { if (condition) { this.sql.WHERE(this.formatSql(String.format("%s = {0}", column), params)); } return this; }

3.ne—拼接不等于的where语句 column<>params

public Wrapper<T> ne(boolean condition, String column, Object params) { if (condition) { this.sql.WHERE(this.formatSql(String.format("%s <> {0}", column), params)); } return this; }

4.allEq–拼接数据以map封装的等于的where语句

public Wrapper<T> allEq(boolean condition, Map<String, Object> params) { if (condition && MapUtils.isNotEmpty(params)) { Iterator iterator = params.entrySet().iterator(); while(iterator.hasNext()) { Entry<String, Object> entry = (Entry)iterator.next(); Object value = entry.getValue(); if (StringUtils.checkValNotNull(value)) { this.sql.WHERE(this.formatSql(String.format("%s = {0}", entry.getKey()), entry.getValue())); } } } return this; }

5.gt—-拼接大于号的where语句

public Wrapper<T> gt(boolean condition, String column, Object params) { if (condition) { this.sql.WHERE(this.formatSql(String.format("%s > {0}", column), params)); } return this; }

6.ge–拼接大于等于号的where语句 （代码类似5）  7.lt—拼接小于号的where语句  8.le—小于等于

/** * AND (user_name=#{ew.paramNameValuePairs.MPGENVAL1} AND id=1) OR (user_status=#{ew.paramNameValuePairs.MPGENVAL2} OR status=1 AND user_nickname NOT LIKE #{ew.paramNameValuePairs.MPGENVAL3}) AND (new=xx AND hhh LIKE #{ew.paramNameValuePairs.MPGENVAL4}) AND (pwd=11 AND n1 IS NOT NULL AND n2 IS NOT NULL AND n3 IS NULL) GROUP BY x1, x2,x3 HAVING (x1=11 AND x3=433) ORDER BY dd, d1,d2 */ ew.where("user_name={0}", "'zhangsan'").and("id=1") .orNew("user_status={0}", "0").or("status=1") .notLike("user_nickname", "notvalue") .andNew("new=xx").like("hhh", "ddd") .andNew("pwd=11").isNotNull("n1,n2").isNull("n3") .groupBy("x1").groupBy("x2,x3") .having("x1=11").having("x3=433") .orderBy("dd").orderBy("d1,d2");

9.and — 在没有出现下一个andNew或者orNew之前的所有where条件在一个括号里  10.andNew –新建一组and语句  11.or,orNew–同上

 

---------------------  转自：https://blog.csdn.net/qq_36752632/article/details/79035980