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eladmin
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Code Issues Releases Wiki Activity

# 分页插件

pull/432/head
廖金龙 2020-07-06 22:58:38 +08:00
parent a90c851caf
commit ea0e24dc36
5 changed files with 81 additions and 14 deletions
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21
eladmin-common/src/main/java/me/zhengjie/base/BaseRepository.java
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@ -17,10 +17,14 @@ package me.zhengjie.base;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.OrderItem;
import com.baomidou.mybatisplus.core.metadata.TableInfo;
import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.service.IService;
import com.google.common.collect.Sets;
import me.zhengjie.db.ElSpecification;
import me.zhengjie.utils.QueryHelp;
import me.zhengjie.utils.StringUtils;
import me.zhengjie.utils.WhereFun;
import me.zhengjie.utils.WrapperUtils;
import me.zhengjie.utils.enums.DbType;
@ -295,12 +299,21 @@ public class BaseRepository<I extends IService<T>, J extends JpaRepository<T, ID
com.baomidou.mybatisplus.extension.plugins.pagination.Page<T> page = new com.baomidou.mybatisplus.extension.plugins.pagination.Page<>();
page.setPages(pageable.getPageNumber());
page.setSize(pageable.getPageSize());
page.setCurrent(pageable.getOffset());
page.setCurrent(pageable.getOffset() / page.getSize() + 1);
final Sort sort = pageable.getSort();
final ArrayList<OrderItem> orders = new ArrayList<>();
final Class<T> clazz = specifications.getClazz();
final TableInfo tableInfo = TableInfoHelper.getTableInfo(clazz);
final String name = clazz.getName();
sort.get().forEach(order -> {
final Sort.Direction direction = order.getDirection();
final String property = order.getProperty();
/**
* 翻译位 数据库 Column
*/
final String tableColumnFromField = QueryHelp.getTableColumnFromField(tableInfo, name, order.getProperty());
final String property = StringUtils.isNotBlank(tableColumnFromField) ? tableColumnFromField : order.getProperty();
final OrderItem orderItem;
switch (direction) {
case DESC:
@ -315,7 +328,9 @@ public class BaseRepository<I extends IService<T>, J extends JpaRepository<T, ID
orders.add(orderItem);
});
page.setOrders(orders);
return new PageImpl<T>(mpService.page(page, queryWrapper).getRecords(),
final List<T> records1 = mpService.getBaseMapper().selectPage(page, queryWrapper).getRecords();
final List<T> records = mpService.page(page, queryWrapper).getRecords();
return new PageImpl<T>(records,
pageable, page.getTotal());
}

15
eladmin-common/src/main/java/me/zhengjie/db/ElSpecification.java
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@ -43,6 +43,21 @@ public class ElSpecification<K> implements Specification {
return QueryHelp.getQueryWrapper(criteria, clazz);
}
public Object getCriteria() {
return criteria;
}
public Class<K> getClazz() {
return clazz;
}
public Specification<K> getSpecification() {
return specification;
}
public void setSpecification(Specification<K> specification) {
this.specification = specification;
}
/**
* Creates a WHERE clause for a query of the referenced entity in form of a {@link Predicate} for the given

39
eladmin-common/src/main/java/me/zhengjie/db/MybatisPlusConfig.java Normal file
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@ -0,0 +1,39 @@
package me.zhengjie.db;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.extension.plugins.pagination.optimize.JsqlParserCountOptimize;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.annotation.EnableTransactionManagement;
/**
* MybatisPlus 分页插件
*
* @author liaojinlong
* @since 2020/7/6 22:32
*/
@Configuration
@EnableTransactionManagement
@MapperScan({
"me.zhengjie.repository.mp",
"me.zhengjie.modules.system.repository.mp"
})
public class MybatisPlusConfig {
/**
* 分页插件
*/
@Bean
public PaginationInterceptor paginationInterceptor() {
PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
// 设置请求的页面大于最大页后操作， true调回到首页，false 继续请求 默认false
paginationInterceptor.setOverflow(false);
// 设置最大单页限制数量，默认 500 条，-1 不受限制
paginationInterceptor.setLimit(500);
// 开启 count 的 join 优化,只针对部分 left join
paginationInterceptor.setCountSqlParser(new JsqlParserCountOptimize(true));
return paginationInterceptor;
}
}

16
eladmin-common/src/main/java/me/zhengjie/utils/QueryHelp.java
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@ -42,7 +42,7 @@ import java.util.concurrent.atomic.AtomicReference;
public class QueryHelp {
public static ThreadLocal<QueryWrapper> queryWrapperThreadLocal = new ThreadLocal<>();
protected static Map<String, List<Field>> FIELD_CACHE = new ConcurrentHashMap<>(16);
protected static Map<Field, ElField> COLUMN_CACHE = new ConcurrentHashMap<>(16);
protected static Map<String, ElField> COLUMN_CACHE = new ConcurrentHashMap<>(16);
/**
* JPA 查询参数构建
@ -228,7 +228,7 @@ public class QueryHelp {
if (Objects.isNull(value)) {
return;
}
attributeName = getTableColumnFromField(tableInfo, field);
attributeName = getTableColumnFromField(tableInfo, clazz.getName(), field.getName());
} catch (IllegalAccessException e) {
log.error(e.getMessage(), e);
return;
@ -316,6 +316,7 @@ public class QueryHelp {
return true;
}
/**
* 依据Mybatis Plus 获取 Database 真实Column 字段
*
@ -323,16 +324,17 @@ public class QueryHelp {
* @param field
* @return /
*/
public static String getTableColumnFromField(TableInfo tableInfo, Field field) {
public static String getTableColumnFromField(TableInfo tableInfo, String className, String field) {
String columnName = null;
if (FIELD_CACHE.containsKey(field)) {
final String key = className + "_" + field;
if (FIELD_CACHE.containsKey(key)) {
final ElField elField = COLUMN_CACHE.get(field);
if (elField.isStatus()) {
columnName = elField.getColumn();
}
} else {
AtomicReference<String> tableColumnName = null;
final String name = field.getName();
final String name = field;
for (TableFieldInfo item : tableInfo.getFieldList()) {
if (item.getField().getName().equals(name)) {
tableColumnName = new AtomicReference<>();
@ -342,9 +344,9 @@ public class QueryHelp {
}
if (Objects.nonNull(tableColumnName)) {
columnName = tableColumnName.get();
COLUMN_CACHE.put(field, new ElField(columnName, true));
COLUMN_CACHE.put(key, new ElField(columnName, true));
} else {
COLUMN_CACHE.put(field, new ElField(columnName, false));
COLUMN_CACHE.put(key, new ElField(columnName, false));
}
}
return columnName;

4
eladmin-system/src/main/java/me/zhengjie/AppRun.java
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@ -40,10 +40,6 @@ import org.springframework.web.bind.annotation.RestController;
@Api(hidden = true)
@SpringBootApplication
@EnableTransactionManagement
@MapperScan({
"me.zhengjie.repository.mp",
"me.zhengjie.modules.system.repository.mp"
})
@EnableJpaAuditing(auditorAwareRef = "auditorAware")
public class AppRun {