mybatisplus添加真正的批量新增、批量更新的实现
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2022-03-24 08:29:04
使用mybatis-plus来进行批量新增和更新时,你会发现其实是一条条sql执行,下面进行优化。1.添加insertbatchmethod和updatebatchmethod类import com....
使用mybatis-plus来进行批量新增和更新时,你会发现其实是一条条sql执行,下面进行优化。
1.添加insertbatchmethod和updatebatchmethod类
import com.baomidou.mybatisplus.core.injector.abstractmethod; import com.baomidou.mybatisplus.core.metadata.tableinfo; import lombok.extern.slf4j.slf4j; import org.apache.ibatis.executor.keygen.nokeygenerator; import org.apache.ibatis.mapping.mappedstatement; import org.apache.ibatis.mapping.sqlsource; /** * 批量插入方法实现 */ @slf4j public class insertbatchmethod extends abstractmethod { @override public mappedstatement injectmappedstatement(class<?> mapperclass, class<?> modelclass, tableinfo tableinfo) { final string sql = "<script>insert into %s %s values %s</script>"; final string fieldsql = preparefieldsql(tableinfo); final string valuesql = preparevaluessql(tableinfo); final string sqlresult = string.format(sql, tableinfo.gettablename(), fieldsql, valuesql); //log.debug("sqlresult----->{}", sqlresult); sqlsource sqlsource = languagedriver.createsqlsource(configuration, sqlresult, modelclass); return this.addinsertmappedstatement(mapperclass, modelclass, "insertbatch", sqlsource, new nokeygenerator(), null, null); } private string preparefieldsql(tableinfo tableinfo) { stringbuilder fieldsql = new stringbuilder(); fieldsql.append(tableinfo.getkeycolumn()).append(","); tableinfo.getfieldlist().foreach(x -> fieldsql.append(x.getcolumn()).append(",")); fieldsql.delete(fieldsql.length() - 1, fieldsql.length()); fieldsql.insert(0, "("); fieldsql.append(")"); return fieldsql.tostring(); } private string preparevaluessql(tableinfo tableinfo) { final stringbuilder valuesql = new stringbuilder(); valuesql.append("<foreach collection=\"list\" item=\"item\" index=\"index\" open=\"(\" separator=\"),(\" close=\")\">"); valuesql.append("#{item.").append(tableinfo.getkeyproperty()).append("},"); tableinfo.getfieldlist().foreach(x -> valuesql.append("#{item.").append(x.getproperty()).append("},")); valuesql.delete(valuesql.length() - 1, valuesql.length()); valuesql.append("</foreach>"); return valuesql.tostring(); } }
import com.baomidou.mybatisplus.core.injector.abstractmethod; import com.baomidou.mybatisplus.core.metadata.tableinfo; import lombok.extern.slf4j.slf4j; import org.apache.ibatis.mapping.mappedstatement; import org.apache.ibatis.mapping.sqlsource; /** * 批量更新方法实现,条件为主键,选择性更新 */ @slf4j public class updatebatchmethod extends abstractmethod { @override public mappedstatement injectmappedstatement(class<?> mapperclass, class<?> modelclass, tableinfo tableinfo) { string sql = "<script>\n<foreach collection=\"list\" item=\"item\" separator=\";\">\nupdate %s %s where %s=#{%s} %s\n</foreach>\n</script>"; string additional = tableinfo.iswithversion() ? tableinfo.getversionfieldinfo().getversionoli("item", "item.") : "" + tableinfo.getlogicdeletesql(true, true); string setsql = sqlset(tableinfo.iswithlogicdelete(), false, tableinfo, false, "item", "item."); string sqlresult = string.format(sql, tableinfo.gettablename(), setsql, tableinfo.getkeycolumn(), "item." + tableinfo.getkeyproperty(), additional); //log.debug("sqlresult----->{}", sqlresult); sqlsource sqlsource = languagedriver.createsqlsource(configuration, sqlresult, modelclass); // 第三个参数必须和rootmapper的自定义方法名一致 return this.addupdatemappedstatement(mapperclass, modelclass, "updatebatch", sqlsource); } }
2.添加自定义方法sql注入器
import com.baomidou.mybatisplus.core.injector.abstractmethod; import com.baomidou.mybatisplus.core.injector.defaultsqlinjector; import java.util.list; public class customizedsqlinjector extends defaultsqlinjector { /** * 如果只需增加方法,保留mybatis plus自带方法, * 可以先获取super.getmethodlist(),再添加add */ @override public list<abstractmethod> getmethodlist(class<?> mapperclass) { list<abstractmethod> methodlist = super.getmethodlist(mapperclass); methodlist.add(new insertbatchmethod()); methodlist.add(new updatebatchmethod()); return methodlist; } }
3.注入配置
@mapperscan("com.xxx.mapper") @configuration public class mybatisplusconfig { @bean public customizedsqlinjector customizedsqlinjector() { return new customizedsqlinjector(); } }
4.添加通用mapper
import com.baomidou.mybatisplus.core.mapper.basemapper; import org.apache.ibatis.annotations.param; import java.util.list; /** * 根mapper,给表mapper继承用的,可以自定义通用方法 * {@link com.baomidou.mybatisplus.core.mapper.basemapper} * {@link com.baomidou.mybatisplus.extension.service.iservice} * {@link com.baomidou.mybatisplus.extension.service.impl.serviceimpl} */ public interface rootmapper<t> extends basemapper<t> { /** * 自定义批量插入 * 如果要自动填充,@param(xx) xx参数名必须是 list/collection/array 3个的其中之一 */ int insertbatch(@param("list") list<t> list); /** * 自定义批量更新,条件为主键 * 如果要自动填充,@param(xx) xx参数名必须是 list/collection/array 3个的其中之一 */ int updatebatch(@param("list") list<t> list); }
5.如何使用
@repository public interface userinfomapper extends rootmapper<userinfo> { } public interface userinfoservice extends iservice<userinfo> { int saveall(); int updateall(); } @service public class userinfoserviceimpl extends serviceimpl<userinfomapper, userinfo> implements userinfoservice{ @override public int saveall() { list<userinfo> list = new arraylist<>(); for (int i = 0; i < 20; i++) { userinfo userinfo = new userinfo(); userinfo.setusername("厉害" + i); userinfo.setsalt(randomstringutils.randomalphabetic(6)); userinfo.setpassword(secureutil.sha256("123456" + userinfo.getsalt())); userinfo.setsex(0); userinfo.setavatar(loginserviceimpl.avatar); list.add(userinfo); } return basemapper.insertbatch(list); } @override public int updateall() { list<userinfo> userinfos = basemapper.selectlist(wrappers.<userinfo>lambdaquery().between(baseentity::getid, 43, 62)); userinfos.foreach(userinfo -> { userinfo.setusername("更新了" + idutil.simpleuuid()); }); return basemapper.updatebatch(userinfos); } }
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