封裝代碼如下，
package com.mischen.pay.common.core.dao.impl;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.ibatis.session.SqlSession;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import org.springframework.beans.factory.annotation.Autowired;
import com.mischen.pay.common.core.dao.BaseDao;
import com.mischen.pay.common.core.entity.BaseEntity;
import com.mischen.pay.common.core.exception.BizException;
import com.mischen.pay.common.core.page.PageBean;
import com.mischen.pay.common.core.page.PageParam;
/**
* @類功能說明： 數據訪問層基礎支撐類.
* @類修改者：
* @創建時間：2020-3-29 上午10:14:10
* @版本：V2.0
*/
public abstract class BaseDaoImpl<T extends BaseEntity> extends SqlSessionDaoSupport implements BaseDao<T> {
protected static final Log LOG = LogFactory.getLog(BaseDaoImpl.class);
public static final String SQL_INSERT = "insert";
public static final String SQL_BATCH_INSERT = "batchInsert";
public static final String SQL_UPDATE_BY_ID = "updateByPrimaryKey";
public static final String SQL_BATCH_UPDATE_BY_IDS = "batchUpdateByIds";
public static final String SQL_BATCH_UPDATE_BY_COLUMN = "batchUpdateByColumn";
public static final String SQL_SELECT_BY_ID = "selectByPrimaryKey";
public static final String SQL_LIST_BY_COLUMN = "listByColumn";
public static final String SQL_COUNT_BY_COLUMN = "getCountByColumn";
public static final String SQL_DELETE_BY_ID = "deleteByPrimaryKey";
public static final String SQL_BATCH_DELETE_BY_IDS = "batchDeleteByIds";
public static final String SQL_BATCH_DELETE_BY_COLUMN = "batchDeleteByColumn";
public static final String SQL_LIST_PAGE = "listPage";
public static final String SQL_LIST_BY = "listBy";
public static final String SQL_LIST_PAGE_COUNT = "listPageCount";
public static final String SQL_COUNT_BY_PAGE_PARAM = "countByPageParam"; // 根據當前分頁參數進行統計
/**
* 注入SqlSessionTemplate實例(要求Spring中進行SqlSessionTemplate的配置).
* 可以調用sessionTemplate完成數據庫操作.
*/
@Autowired
private SqlSessionTemplate sessionTemplate;
public SqlSessionTemplate getSessionTemplate() {
return sessionTemplate;
}
public void setSessionTemplate(SqlSessionTemplate sessionTemplate) {
this.sessionTemplate = sessionTemplate;
}
public SqlSession getSqlSession() {
return super.getSqlSession();
}
/**
* 單條插入數據.
*/
public int insert(T entity) {
int result = sessionTemplate.insert(getStatement(SQL_INSERT), entity);
if (result <= 0) {
throw BizException.DB_INSERT_RESULT_0.newInstance("數據庫操作,insert返回0.{%s}", getStatement(SQL_INSERT));
}
return result;
}
/**
* 批量插入數據.
*/
public int insert(List<T> list) {
if (list.isEmpty() || list.size() <= 0) {
return 0;
}
int result = sessionTemplate.insert(getStatement(SQL_BATCH_INSERT), list);
if (result <= 0) {
throw BizException.DB_INSERT_RESULT_0.newInstance("數據庫操作,batchInsert返回0.{%s}", getStatement(SQL_BATCH_INSERT));
}
return result;
}
/**
* 根據id單條更新數據.
*/
public int update(T entity) {
entity.setEditTime(new Date());
int result = sessionTemplate.update(getStatement(SQL_UPDATE_BY_ID), entity);
if (result <= 0) {
throw BizException.DB_UPDATE_RESULT_0.newInstance("數據庫操作,updateByPrimaryKey返回0.{%s}", getStatement(SQL_UPDATE_BY_ID));
}
return result;
}
/**
* 根據id批量更新數據.
*/
public int update(List<T> list) {
if (list.isEmpty() || list.size() <= 0) {
return 0;
}
int result = sessionTemplate.update(getStatement(SQL_BATCH_UPDATE_BY_IDS), list);
if (result <= 0) {
throw BizException.DB_UPDATE_RESULT_0.newInstance("數據庫操作,batchUpdateByIds返回0.{%s}", getStatement(SQL_BATCH_UPDATE_BY_IDS));
}
return result;
}
/**
* 根據column批量更新數據.
*/
public int update(Map<String, Object> paramMap) {
if (paramMap == null) {
return 0;
}
int result = sessionTemplate.update(getStatement(SQL_BATCH_UPDATE_BY_COLUMN), paramMap);
if (result <= 0) {
throw BizException.DB_UPDATE_RESULT_0.newInstance("數據庫操作,batchUpdateByColumn返回0.{%s}", getStatement(SQL_BATCH_UPDATE_BY_COLUMN));
}
return result;
}
/**
* 根據id查詢數據.
*/
public T getById(String id) {
return sessionTemplate.selectOne(getStatement(SQL_SELECT_BY_ID), id);
}
/**
* 根據column查詢數據.
*/
public T getByColumn(Map<String, Object> paramMap) {
if (paramMap == null) {
return null;
}
return sessionTemplate.selectOne(getStatement(SQL_LIST_BY_COLUMN), paramMap);
}
/**
* 根據條件查詢 getBy: selectOne <br/>
*
* @param paramMap
* @return
*/
public T getBy(Map<String, Object> paramMap) {
if (paramMap == null) {
return null;
}
return sessionTemplate.selectOne(getStatement(SQL_LIST_BY), paramMap);
}
/**
* 根據條件查詢列表數據.
*/
public List<T> listBy(Map<String, Object> paramMap) {
if (paramMap == null) {
return null;
}
return sessionTemplate.selectList(getStatement(SQL_LIST_BY), paramMap);
}
/**
* 根據column查詢列表數據.
*/
public List<T> listByColumn(Map<String, Object> paramMap) {
if (paramMap == null) {
return null;
}
return sessionTemplate.selectList(getStatement(SQL_LIST_BY_COLUMN), paramMap);
}
/**
* 根據column查詢記錄數.
*/
public Long getCountByColumn(Map<String, Object> paramMap) {
if (paramMap == null) {
return null;
}
return sessionTemplate.selectOne(getStatement(SQL_COUNT_BY_COLUMN), paramMap);
}
/**
* 根據id刪除數據.
*/
public int delete(String id) {
return (int) sessionTemplate.delete(getStatement(SQL_DELETE_BY_ID), id);
}
/**
* 根據id批量刪除數據.
*/
public int delete(List<T> list) {
if (list.isEmpty() || list.size() <= 0) {
return 0;
} else {
return (int) sessionTemplate.delete(getStatement(SQL_BATCH_DELETE_BY_IDS), list);
}
}
/**
* 根據column批量刪除數據.
*/
public int delete(Map<String, Object> paramMap) {
if (paramMap == null) {
return 0;
} else {
return (int) sessionTemplate.delete(getStatement(SQL_BATCH_DELETE_BY_COLUMN), paramMap);
}
}
/**
* 分頁查詢數據 .
*/
public PageBean listPage(PageParam pageParam, Map<String, Object> paramMap) {
if (paramMap == null) {
paramMap = new HashMap<String, Object>();
}
// 統計總記錄數
Long totalCount = sessionTemplate.selectOne(getStatement(SQL_LIST_PAGE_COUNT), paramMap);
// 校驗當前頁數
int currentPage = PageBean.checkCurrentPage(totalCount.intValue(), pageParam.getNumPerPage(), pageParam.getPageNum());
pageParam.setPageNum(currentPage); // 爲當前頁重新設值
// 校驗頁面輸入的每頁記錄數numPerPage是否合法
int numPerPage = PageBean.checkNumPerPage(pageParam.getNumPerPage()); // 校驗每頁記錄數
pageParam.setNumPerPage(numPerPage); // 重新設值
// 根據頁面傳來的分頁參數構造SQL分頁參數
paramMap.put("pageFirst", (pageParam.getPageNum() - 1) * pageParam.getNumPerPage());
paramMap.put("pageSize", pageParam.getNumPerPage());
paramMap.put("startRowNum", (pageParam.getPageNum() - 1) * pageParam.getNumPerPage());
paramMap.put("endRowNum", pageParam.getPageNum() * pageParam.getNumPerPage());
// 獲取分頁數據集
List<Object> list = sessionTemplate.selectList(getStatement(SQL_LIST_PAGE), paramMap);
Object isCount = paramMap.get("isCount"); // 是否統計當前分頁條件下的數據：1:是，其他爲否
if (isCount != null && "1".equals(isCount.toString())) {
Map<String, Object> countResultMap = sessionTemplate.selectOne(getStatement(SQL_COUNT_BY_PAGE_PARAM), paramMap);
return new PageBean(pageParam.getPageNum(), pageParam.getNumPerPage(), totalCount.intValue(), list, countResultMap);
} else {
// 構造分頁對象
return new PageBean(pageParam.getPageNum(), pageParam.getNumPerPage(), totalCount.intValue(), list);
}
}
/**
* 函數功能說明 ： 獲取Mapper命名空間.
*
* @參數：@param sqlId
* @參數：@return
* @return：String
* @throws
*/
public String getStatement(String sqlId) {
String name = this.getClass().getName();
// 單線程用StringBuilder，確保速度；多線程用StringBuffer,確保安全
StringBuilder sb = new StringBuilder();
sb.append(name).append(".").append(sqlId);
return sb.toString();
}
}