Mybatis Plus快速重构真批量sql入库操作

摇曳的精灵2024-09-11 16:44

Mybatis快速重构真批量sql入库操作

基本思路

重构mybatis默认方法saveBatch和saveOrUpdateBatch的实现

基本步骤
  1. 真批量保存实现类InsertBatchMethod
  2. 真批量更新实现类MysqlInsertOrUpdateBath
  3. 注册InsertBatchMethod和MysqlInsertOrUpdateBath到EasySqlInjector
  4. 注册EasySqlInjector到Mybatis配置类
  5. 实现自定义RootMapper
  6. 要实现真批量操作的实体类的Mapper继承RootMapper
  7. 自定义MyServiceImpl实现类
  8. 实体类ServiceImpl继承MyServiceImpl
  9. 批量方法的使用
详细步骤

  1. 真批量保存实现类InsertBatchMethod

    java 复制代码 
    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);
        // 第三个参数必须和RootMapper的自定义方法名一致
        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();
    }
}

  2. 真批量更新实现类MysqlInsertOrUpdateBath

    java 复制代码 
    import com.baomidou.mybatisplus.core.injector.AbstractMethod;
import com.baomidou.mybatisplus.core.metadata.TableInfo;
import org.apache.ibatis.executor.keygen.NoKeyGenerator;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlSource;
import org.springframework.util.StringUtils;

public class MysqlInsertOrUpdateBath extends AbstractMethod {

    @Override
    public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
        final String sql = "<script>insert into %s %s values %s ON DUPLICATE KEY UPDATE %s</script>";
        final String tableName = tableInfo.getTableName();
        final String filedSql = prepareFieldSql(tableInfo);
        final String modelValuesSql = prepareModelValuesSql(tableInfo);
        final String duplicateKeySql =prepareDuplicateKeySql(tableInfo);
        final String sqlResult = String.format(sql, tableName, filedSql, modelValuesSql,duplicateKeySql);
        //System.out.println("savaorupdatesqlsql="+sqlResult);
        SqlSource sqlSource = languageDriver.createSqlSource(configuration, sqlResult, modelClass);
        return this.addInsertMappedStatement(mapperClass, modelClass, "mysqlInsertOrUpdateBath", sqlSource, new NoKeyGenerator(), null, null);
    }

    /**
     * 准备ON DUPLICATE KEY UPDATE sql
     * @param tableInfo
     * @return
     */
    private String prepareDuplicateKeySql(TableInfo tableInfo) {
        final StringBuilder duplicateKeySql = new StringBuilder();
        if(!StringUtils.isEmpty(tableInfo.getKeyColumn())) {
            duplicateKeySql.append(tableInfo.getKeyColumn()).append("=values(").append(tableInfo.getKeyColumn()).append("),");
        }

        tableInfo.getFieldList().forEach(x -> {
            duplicateKeySql.append(x.getColumn())
                    .append("=values(")
                    .append(x.getColumn())
                    .append("),");
        });
        duplicateKeySql.delete(duplicateKeySql.length() - 1, duplicateKeySql.length());
        return duplicateKeySql.toString();
    }

    /**
     * 准备属性名
     * @param tableInfo
     * @return
     */
    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 prepareModelValuesSql(TableInfo tableInfo){
        final StringBuilder valueSql = new StringBuilder();
        valueSql.append("<foreach collection=\"list\" item=\"item\" index=\"index\" open=\"(\" separator=\"),(\" close=\")\">");
        if(!StringUtils.isEmpty(tableInfo.getKeyProperty())) {
            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();
    }
}

  3. 注册InsertBatchMethod和MysqlInsertOrUpdateBath到EasySqlInjector

    java 复制代码 
    import com.baomidou.mybatisplus.core.injector.AbstractMethod;
import com.baomidou.mybatisplus.core.injector.DefaultSqlInjector;
import com.baomidou.mybatisplus.extension.injector.methods.AlwaysUpdateSomeColumnById;
import com.baomidou.mybatisplus.extension.injector.methods.InsertBatchSomeColumn;
import org.springframework.stereotype.Component;
import java.util.List;


@Component
public class EasySqlInjector extends DefaultSqlInjector {

    @Override
    public List<AbstractMethod> getMethodList(Class<?> mapperClass) {
        List<AbstractMethod> methodList = super.getMethodList(mapperClass);
        // 真批量插入接口
        methodList.add(new InsertBatchSomeColumn());
        // 总是更新字段，不忽略null
        methodList.add(new AlwaysUpdateSomeColumnById(tableFieldInfo ->
                !tableFieldInfo.getColumn().equals("DELETED")
                && !tableFieldInfo.getColumn().equals("ID")
                && !tableFieldInfo.getColumn().equals("CREATE_TIME")
                && !tableFieldInfo.getColumn().equals("CREATE_USER")
                && !tableFieldInfo.getColumn().equals("CREATE_USER_NAME")));
        // 真批量更新
        methodList.add(new InsertBatchMethod());
        methodList.add(new MysqlInsertOrUpdateBath());
        return methodList;
    }
}

  4. 注册EasySqlInjector到Mybatis配置类

    java 复制代码 
    @Slf4j
@Configuration
@EnableNacosConfig
@EnableConfigurationProperties
@MapperScan("com.**.dao")
public class OPAConfiguration implements EnvironmentAware,BeanFactoryAware{

@Bean
    public xxxMybatisContext xxxMybatisContext(xxxProperties xxxProperties, MybatisPlusProperties properties) throws Exception {
    	xxxMybatisContext xxxMybatisContext=new xxxMybatisContext();

        // TODO 使用 MybatisSqlSessionFactoryBean 而不是 SqlSessionFactoryBean
        MybatisSqlSessionFactoryBean factory = new MybatisSqlSessionFactoryBean();
        factory.setDataSource(this.dataSource);
        factory.setVfs(SpringBootVFS.class);
        factory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:com/xxx/xxx/xxx/mapping/*Mapper.xml"));
        // TODO 此处必为非 NULL
        GlobalConfig globalConfig = properties.getGlobalConfig();
        GlobalConfig newGlobalConfig=new GlobalConfig();
        BeanUtils.copyProperties(globalConfig, newGlobalConfig);
        newGlobalConfig.setMetaObjectHandler(new xxxMetaObjectHandler());
		newGlobalConfig.setSqlInjector(new EasySqlInjector());
        factory.setGlobalConfig(newGlobalConfig);
        SqlSessionFactory sqlSessionFactory=factory.getObject();

        newGlobalConfig.setSqlSessionFactory(sqlSessionFactory);
        xxxMybatisContext.setSessionFactory(sqlSessionFactory);
        xxxMybatisContext.setSqlSessionTemplate(new SqlSessionTemplate(sqlSessionFactory));
        ClassPathMapperScanner scanner = new ClassPathMapperScanner((BeanDefinitionRegistry) beanFactory);
        scanner.setSqlSessionTemplate(xxxMybatisContext.getSqlSessionTemplate());
     //   scanner.setBeanNameGenerator(new xxxBeanNameGenerator());
        scanner.registerFilters();
        scanner.scan(
            StringUtils.tokenizeToStringArray("com.xxx.xxx.xxx.mapping", ConfigurableApplicationContext.CONFIG_LOCATION_DELIMITERS));

    	return xxxMybatisContext;
    }
    
}

  5. 实现自定义RootMapper

    java 复制代码 
    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 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);

    /**
     * 自定义批量新增或更新
     * 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 mysqlInsertOrUpdateBath(@Param("list") List<T> list);


}

  6. 要实现真批量操作的实体类的Mapper继承RootMapper

    java 复制代码 
    @Mapper
public interface BudgetVSActualMapper extends RootMapper<BudgetVSActual> {

  7. 自定义MyServiceImpl实现类

    java 复制代码 
    import com.baomidou.mybatisplus.core.conditions.Wrapper;
import com.baomidou.mybatisplus.core.enums.SqlMethod;
import com.baomidou.mybatisplus.core.metadata.TableInfo;
import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
import com.baomidou.mybatisplus.core.toolkit.*;
import com.baomidou.mybatisplus.extension.service.IService;
import com.baomidou.mybatisplus.extension.toolkit.SqlHelper;
import com.pwc.sdc.OPA.mapping.RootMapper;
import org.apache.ibatis.binding.MapperMethod;
import org.apache.ibatis.logging.Log;
import org.apache.ibatis.logging.LogFactory;
import org.apache.ibatis.session.SqlSession;
import org.mybatis.spring.SqlSessionUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.ResolvableType;
import org.springframework.transaction.annotation.Transactional;
import java.io.Serializable;
import java.util.*;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;


public  class MyServiceImpl<M extends RootMapper<T>, T> implements IService<T> {
    protected Log log = LogFactory.getLog(this.getClass());
    @Autowired
    protected M baseMapper;
    protected Class<T> entityClass = this.currentModelClass();
    protected Class<T> mapperClass = this.currentMapperClass();

    public MyServiceImpl() {
    }

    public M getBaseMapper() {
        return this.baseMapper;
    }

    public Class<T> getEntityClass() {
        return this.entityClass;
    }

    /** @deprecated */
    @Deprecated
    protected boolean retBool(Integer result) {
        return SqlHelper.retBool(result);
    }

    protected Class<T> currentMapperClass() {
        return (Class)this.getResolvableType().as(MyServiceImpl.class).getGeneric(new int[]{0}).getType();
    }

    protected Class<T> currentModelClass() {
        return (Class)this.getResolvableType().as(MyServiceImpl.class).getGeneric(new int[]{1}).getType();
    }

    protected ResolvableType getResolvableType() {
        return ResolvableType.forClass(ClassUtils.getUserClass(this.getClass()));
    }

    /** @deprecated */
    @Deprecated
    protected SqlSession sqlSessionBatch() {
        return SqlHelper.sqlSessionBatch(this.entityClass);
    }

    /** @deprecated */
    @Deprecated
    protected void closeSqlSession(SqlSession sqlSession) {
        SqlSessionUtils.closeSqlSession(sqlSession, GlobalConfigUtils.currentSessionFactory(this.entityClass));
    }

    /** @deprecated */
    @Deprecated
    protected String sqlStatement(SqlMethod sqlMethod) {
        return SqlHelper.table(this.entityClass).getSqlStatement(sqlMethod.getMethod());
    }

    @Transactional(
            rollbackFor = {Exception.class}
    )
    public boolean saveBatch(Collection<T> entityList, int batchSize) {
        if(CollectionUtils.isEmpty(entityList)){
            return true;
        }
        int maxNum=2000;
        int limit = countStep(entityList.size(), maxNum);
        List<List<T>> subList = new ArrayList<>();
        Stream.iterate(0, n -> n + 1).limit(limit).forEach(i -> {
            subList.add(entityList.stream().skip(i * maxNum).limit(maxNum).collect(Collectors.toList()));
        });
        for (List<T> t : subList) {
            this.baseMapper.insertBatch(t);
        }
        return true;
    }

    protected String getSqlStatement(SqlMethod sqlMethod) {
        return SqlHelper.getSqlStatement(this.mapperClass, sqlMethod);
    }

    @Transactional(
            rollbackFor = {Exception.class}
    )
    public boolean saveOrUpdate(T entity) {
        if (null == entity) {
            return false;
        } else {
            TableInfo tableInfo = TableInfoHelper.getTableInfo(this.entityClass);
            Assert.notNull(tableInfo, "error: can not execute. because can not find cache of TableInfo for entity!", new Object[0]);
            String keyProperty = tableInfo.getKeyProperty();
            Assert.notEmpty(keyProperty, "error: can not execute. because can not find column for id from entity!", new Object[0]);
            Object idVal = ReflectionKit.getFieldValue(entity, tableInfo.getKeyProperty());
            return !StringUtils.checkValNull(idVal) && !Objects.isNull(this.getById((Serializable)idVal)) ? this.updateById(entity) : this.save(entity);
        }
    }

    @Transactional(
            rollbackFor = {Exception.class}
    )
    public boolean saveOrUpdateBatch(Collection<T> entityList, int batchSize) {
        if(CollectionUtils.isEmpty(entityList)){
            return true;
        }
        int maxNum=2000;
        int limit = countStep(entityList.size(), maxNum);
        List<List<T>> subList = new ArrayList<>();
        Stream.iterate(0, n -> n + 1).limit(limit).forEach(i -> {
            subList.add(entityList.stream().skip(i * maxNum).limit(maxNum).collect(Collectors.toList()));
        });
        for (List<T> t : subList) {
            this.baseMapper.mysqlInsertOrUpdateBath(t);
        }
        return true;
    }
    private static Integer countStep(Integer size, Integer maxNum) {
        return (size + maxNum - 1) / maxNum;
    }


    @Transactional(
            rollbackFor = {Exception.class}
    )
    public boolean updateBatchById(Collection<T> entityList, int batchSize) {
        String sqlStatement = this.getSqlStatement(SqlMethod.UPDATE_BY_ID);
        return this.executeBatch(entityList, batchSize, (sqlSession, entity) -> {
            MapperMethod.ParamMap<T> param = new MapperMethod.ParamMap();
            param.put("et", entity);
            sqlSession.update(sqlStatement, param);
        });
    }

    public T getOne(Wrapper<T> queryWrapper, boolean throwEx) {
        return throwEx ? this.baseMapper.selectOne(queryWrapper) : SqlHelper.getObject(this.log, this.baseMapper.selectList(queryWrapper));
    }

    public Map<String, Object> getMap(Wrapper<T> queryWrapper) {
        return (Map)SqlHelper.getObject(this.log, this.baseMapper.selectMaps(queryWrapper));
    }

    public <V> V getObj(Wrapper<T> queryWrapper, Function<? super Object, V> mapper) {
        return SqlHelper.getObject(this.log, this.listObjs(queryWrapper, mapper));
    }

    /** @deprecated */
    @Deprecated
    protected boolean executeBatch(Consumer<SqlSession> consumer) {
        return SqlHelper.executeBatch(this.entityClass, this.log, consumer);
    }

    protected <E> boolean executeBatch(Collection<E> list, int batchSize, BiConsumer<SqlSession, E> consumer) {
        return SqlHelper.executeBatch(this.entityClass, this.log, list, batchSize, consumer);
    }

    protected <E> boolean executeBatch(Collection<E> list, BiConsumer<SqlSession, E> consumer) {
        return this.executeBatch(list, 1000, consumer);
    }

  8. 实体类ServiceImpl继承MyServiceImpl

    java 复制代码 
    public class BudgetVSActualServiceImpl extends MyServiceImpl<BudgetVSActualMapper, BudgetVSActual> implements BudgetVSActualService {

  9. 批量方法的使用

    java 复制代码 
    @Autowired
private IService<T> iService;

//批量保存数据
iService.saveBatch(DataList);
//批量更新数据
iService.saveOrUpdateBatch(DataList);
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