mybatis-plus 使用Condition拼接Sql语句各方法的用法
作者：万万没想到0831
这篇文章主要介绍了mybatis-plus 使用Condition拼接Sql语句各方法的用法，具有很好的参考价值，希望对大家有所帮助。如有错误或未考虑完全的地方，望不吝赐教
mybatis-plus Condition拼接Sql语句各方法
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
mybatis-plus 自定义sql语句
@Override
public Map<String, Object> kccxhj(Term term) throws Exception{
QueryWrapper<EZShangPin> wrapper=new QueryWrapper<>();
if(MyStrUtils.isNotEmpty(term.getQ())){
CWMSTmdrdmx tmdrdmx=new CWMSTmdrdmx();
tmdrdmx.setTm(term.getQ());
tmdrdmx.setSl(1);
tmService.recongnizeSptm(tmdrdmx);
//log("tmdrdmx",tmdrdmx);
if(tmdrdmx.getResult()==0){
wrapper.eq("spdm",tmdrdmx.getSpdm());
}else{
wrapper.like("spdm+'_'+spmc+'_'+isnull(zjf,'')", term.getQ());
}
}
wrapper.eq(MyStrUtils.isNotEmpty(term.getPpdm()),"fjsx1",term.getPpdm());
wrapper.eq(MyStrUtils.isNotEmpty(term.getDldm()),"fjsx2",term.getDldm());
wrapper.eq(MyStrUtils.isNotEmpty(term.getJjdm()),"fjsx3",term.getJjdm());
wrapper.eq(MyStrUtils.isNotEmpty(term.getNddm()),"fjsx4",term.getNddm());
wrapper.eq("isnull(tzsy,0)", 0);
wrapper.eq("ckdm", term.getCurrentsddm());
return repMapper.kccxhj(wrapper);
}
@Mapper
@Repository
public interface RepMapper extends BaseMapper {
Map<String, Object> kccxhj(@Param(Constants.WRAPPER) QueryWrapper wrapper);
}
<select id="kccxhj" resultType="java.util.Map">
SELECT SUM(SL) AS zsl,sum(sl*bzsj) as zje
from(
select ckdm,ShangPin.spdm,ShangPin.spmc,ShangPin.zjf,shanpin.bzsj,ShangPin.FJSX1,ShangPin.FJSX2,ShangPin.FJSX3,ShangPin.FJSX4,SPKCB.SL
from shangpin,SPKCB
where shangpin.spdm=spkcb.SPDM
) a
${ew.customSqlSegment}
</select>
以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。