使用Mybatis SqlProvider类相关注解生成通用Mapper接口

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使用Mybatis SqlProvider类相关注解生成通用Mapper接口

1. 使用Mybatis @SelectProvider @InsertProvider @UpdateProvider @DeleteProvider注解封装BaseMapper<E, I>通用接口, 普通实体类Mapper接口只需要继承该接口, 即可实现基础常用的CRUD功能.

BaseMapper<E, I> : E为实体类型, I为主键类型. 默认认为主键为实体类Entity的第一个字段.

import org.apache.ibatis.annotations.*;import java.util.Collection;
import java.util.List;public interface BaseMapper<E, I> {@SelectProvider(type = BaseSqlProvider.class, method = "getById")E getById(I id);@SelectProvider(type = BaseSqlProvider.class, method = "listByIds")List<E> listByIds(Collection<I> collection);@SelectProvider(type = BaseSqlProvider.class, method = "listByEntity")List<E> listByEntity(E e);@InsertProvider(type = BaseSqlProvider.class, method = "insert")@Options(keyProperty = "id", useGeneratedKeys = true)int insert(E e);@InsertProvider(type = BaseSqlProvider.class, method = "insertBatch")@Options(keyProperty = "id", useGeneratedKeys = true)int insertBatch(Collection<E> list);@UpdateProvider(type = BaseSqlProvider.class, method = "updateById")int updateById(E e);@DeleteProvider(type = BaseSqlProvider.class, method = "deleteById")int deleteById(I id);@DeleteProvider(type = BaseSqlProvider.class, method = "deleteByIds")int deleteByIds(Collection<I> list);@SelectProvider(type = BaseSqlProvider.class, method = "countAll")int countAll();@SelectProvider(type = BaseSqlProvider.class, method = "countByEntity")int countByEntity(E e);}

2. BaseSqlProvider实现如下:

import com.aylvn.bn.common.utils.StrUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.builder.annotation.ProviderContext;import java.lang.reflect.Field;
import java.lang.reflect.ParameterizedType;
import java.util.Arrays;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;/*** 用于缓存和返回通用SQL语句** @author Aylvn* @date 2021-01-24*/
@Slf4j
public class BaseSqlProvider {private static final Map<String, String> BASE_SQL_CACHE_MAP = new ConcurrentHashMap<>();public String getById(ProviderContext context) {return BASE_SQL_CACHE_MAP.computeIfAbsent(getCacheKey(context), value -> {Sql sql = new Sql();sql.select(fields(context));sql.from(tableName(context));sql.where(id(context));log.debug("getById:\n{}", sql.build());return sql.build();});}public String listByIds(ProviderContext context) {return BASE_SQL_CACHE_MAP.computeIfAbsent(getCacheKey(context), value -> {Sql sql = new Sql();sql.select(fields(context));sql.from(tableName(context));sql.whereIn(id(context));log.debug("listByIds:\n{}", sql.build());return sql.build();});}public String listByEntity(ProviderContext context) {return BASE_SQL_CACHE_MAP.computeIfAbsent(getCacheKey(context), value -> {Sql sql = new Sql();sql.select(fields(context));sql.from(tableName(context));sql.where(fields(context));log.debug("listByEntity:\n{}", sql.build());return sql.build();});}public String insert(ProviderContext context) {return BASE_SQL_CACHE_MAP.computeIfAbsent(getCacheKey(context), value -> {Sql sql = new Sql();sql.insertInto(tableName(context), fields(context));sql.values(fields(context));log.debug("insert:\n{}", sql.build());return sql.build();});}public String insertBatch(ProviderContext context) {return BASE_SQL_CACHE_MAP.computeIfAbsent(getCacheKey(context), value -> {Sql sql = new Sql();sql.insertIntoBatch(tableName(context), fields(context));sql.valuesBatch(fields(context));log.debug("insertBatch:\n{}", sql.build());return sql.build();});}public String updateById(ProviderContext context) {return BASE_SQL_CACHE_MAP.computeIfAbsent(getCacheKey(context), value -> {Sql sql = new Sql();sql.update(tableName(context));String[] fieldsExceptId = Arrays.stream(fields(context)).filter(field -> !field.equals(id(context))).toArray(String

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