spring JdbcTemplate 在itest 开源测试管理项目中的浅层（5个使用场景）封装

导读：

主要从4个方面来阐述，1：背景；2：思路；3：代码实现；4：使用

一：封装背景，

在做项目的时候，用的JPA ，有些复杂查询，比如报表用原生的JdbcTemplate ，很不方便;传参也不方便，如果参数多；需要增加分页功能，以及结果集自动转对像等5个常用功能，见第4节。

下面两个图是开源测试管理软件 itest 的统计功能，因为SQL复杂，有些有200行，所以才有后面的 JdbcTemplateWrapper；可以在这体验这些报表（点测试，然后选择一个项目，然后点度量分析），速度还不错，https://itest.work/demo/login.htm

上面这图，SQL 就有200行

二：封装实现思路

（1）实现spring RowMapper 接口，直接把jdbc 结果集转 JAVA 对像(用的反射，访问量大的业务不推荐用这方式)

（2）不通过 RowMapper 接口, 把JdbcTemplate 返回的List<Map<String,Object>>  原生JDBC结果集中，字段名，也就是MAP中的KEY，转换为驼峰规则的JAVA对属性名,方便前端组件使用，不再中间转为VO 或 实体类对像后，再返前端;比传统查询（多了一个LIST的遍历 ，基本对性能影响不大）

（3）封装分页

（4）在  JdbcTemplateWrapper 中包装 NamedParameterJdbcTemplate 解决友好传参的问题,再封几个常用的查询方法，可变长参数，或是以MAP形式传参数 key 为SQL中的参数名占位符 几个常用的查询方法，可变长参数，或是以MAP形式传参数 key 为SQL中的参数名占位符

三：代码实现

   两个类，ObjectRowMapper   和  JdbcTemplateWrapper

ObjectRowMapper    代码如下：

 package cn.com.mypm.framework.jdbc;

 import java.lang.reflect.Field;
 import java.sql.ResultSet;
 import java.sql.ResultSetMetaData;
 import java.sql.SQLException;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;

 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.springframework.jdbc.core.RowMapper;
 import org.springframework.util.StringUtils;

 import cn.com.mypm.common.util.CalendaUtilities;
 import cn.com.mypm.framework.common.config.PropertiesBean;

 /**
  *
 * <p>标题: RowMapper 接口实现</p>
 * <p>业务描述:完成原生结果集到JAVA对像的转换</p>
 * <p>公司:itest.work</p>
 * <p>版权:itest 2018</p>
 * @author itest andy
 * @date 2018年6月8日
 * @version V1.0
  */
 @SuppressWarnings("rawtypes")
 public class ObjectRowMapper implements RowMapper {

     private Class<?> objectClass;
     private String[] columnNames = null;
     private Field[] fields ;
     ///缓存 当前结果集字对段和当前class的 Field的对应关系，
     private Map<String ,Field> currQueryFieldMap ;
     //缓存当前结果集，字段和 JAVA属性名的对应关系 ，按脱峰规则做的转换
     private Map<String ,String> fieldClassMap ;
     private Boolean isConvertSwitch  = null;
     // MYSQL 是否区分大小写的标记，要是区转，要把结果集中，字段名，大写转为小写
     private String mysqlLowerCaseTableNames = null;
     private static Log logger = LogFactory.getLog(ObjectRowMapper.class);
     //缓存某个class 已处理过的字段映射到属性名的关系，避免同一个类每次重新处理，第一个KEY 为类名
     private static Map<String, Map<String, String>> dbColumnClassFieldMap = new ConcurrentHashMap<String, Map<String, String>>();

     public ObjectRowMapper(Class<?> objectClass) {
         this.objectClass = objectClass;
         fields = objectClass.getDeclaredFields();
     }

     public void clean(){
         if(currQueryFieldMap!=null){
             currQueryFieldMap.clear();
             currQueryFieldMap = null;
         }
         if(fieldClassMap!=null){
             fieldClassMap.clear();
             fieldClassMap = null;
         }
         if(fields!=null){
             fields = null;
         }
         if(columnNames!=null){
             columnNames = null;
         }
     }

     /**
      * 该方法自动将数据库字段对应到Object中相应字段 要求：
      * 字段名严格为驼峰形式 == 数据库字段名去掉下划线转为驼峰形式
      * 如user_name 转为userName ，如数据库字段名，无下划线
      * 就只能把首字母变为大小写后的 set ,get
      */
     @Override
     public Object mapRow(ResultSet rs, int rowNum) throws SQLException {

         Object targetObject = null;
         try {
             targetObject = objectClass.newInstance();
         } catch (InstantiationException | IllegalAccessException e) {
             logger.error(e.getMessage(), e);
         }
         if (columnNames == null) {
             ResultSetMetaData rsmd = rs.getMetaData();
             int columnCount = rsmd.getColumnCount();
             columnNames = new String[columnCount];
             for (int i = 0; i < columnCount; i++) {
                 columnNames[i] = rsmd.getColumnLabel(i + 1);
             }
         }
         isConvertSwitch = true;

         if(mysqlLowerCaseTableNames == null){
             String lowerCaseNames = PropertiesBean.getInstance().getProperty("conf.mysql.lowerCaseNames");
             if(lowerCaseNames==null){
                 mysqlLowerCaseTableNames = "yes";
             }else{
                 mysqlLowerCaseTableNames = "no";
             }
         }
         if(currQueryFieldMap==null){
             currQueryFieldMap = new HashMap<String,Field>(columnNames.length);
             for (String columnName : columnNames) {
                 for (Field field : fields) {
                     if(isConvertSwitch==null){
                         if (field.getName().equals(
                                 convertColumnNameToFieldName(columnName))) {
                             currQueryFieldMap.put(columnName, field);
                             break;
                         }
                     }else{
                         if(isConvertSwitch){
                             if(targetObject instanceof  CustomRowMapper&&(!((CustomRowMapper)targetObject).isConvert())){
                                 if (field.getName().equals(columnName)) {
                                     currQueryFieldMap.put(columnName, field);
                                     break;
                                 }
                             }else{
                                 if (field.getName().equals(
                                         convertColumnNameToFieldName(columnName))) {
                                     currQueryFieldMap.put(columnName, field);
                                     break;
                                 }
                             }
                         }

                     }

                 }
             }
         }
         for (String columnName : columnNames) {
             Field field = currQueryFieldMap.get(columnName);
             if(field==null){
                 if(logger.isDebugEnabled()){
                     logger.debug(objectClass.getName() +"is  not property match  db columnName:"+columnName );
                 }
                 continue;
             }
             Object value = rs.getObject(columnName);
             if (value == null) {
                 continue;
             }
             boolean accessFlag = field.isAccessible();
             if (!accessFlag) {
                 field.setAccessible(true);
             }
             if(fieldClassMap==null){
                 fieldClassMap = new HashMap<String,String>(columnNames.length);
             }
             if(fieldClassMap.get(columnName)==null){
                 fieldClassMap.put(columnName, getFieldClaszName(field));
             }
             setFieldValue(targetObject, field, rs, columnName,fieldClassMap.get(columnName));
             // 恢复相应field的权限
             if (!accessFlag) {
                 field.setAccessible(accessFlag);
             }
         }
         return targetObject;
     }

     public String convertColumnNameToFieldName(String columnName) {

         Map<String, String> fieldMap = dbColumnClassFieldMap.get(objectClass
                 .getName());
         boolean emptyFlg = false;
         if (fieldMap == null) {
             fieldMap = new HashMap<String, String>();
             emptyFlg = true;
         }

         String classFieldName = fieldMap.get(columnName);
         if (classFieldName != null) {
             return classFieldName;
         }
         String columnNameKey = columnName;

         //if ("oracle".equals(dbType)||("mysql".equals(dbType)&&"no".equals(mysqlLowerCaseTableNames))) {
             columnName = columnName.toLowerCase();
         //}

         StringBuffer buf = new StringBuffer();
         int i = 0;
         while ((i = columnName.indexOf('_')) > 0) {
             buf.append(columnName.substring(0, i));
             columnName = StringUtils.capitalize(columnName.substring(i + 1));
         }
         buf.append(columnName);
         fieldMap.put(columnNameKey, buf.toString());
         if (emptyFlg) {
             dbColumnClassFieldMap.put(objectClass.getName(), fieldMap);
         }
         return fieldMap.get(columnNameKey);
     }

     /**
      * 根据类型对具体对象属性赋值
      */
     public static void setFieldValue(Object targetObj, Field field,
             ResultSet rs, String columnLabel,String fieldClass) {

         try {
             if ("String".equals(fieldClass)) {
                 field.set(targetObj, rs.getString(columnLabel));
             } else if ("Double".equals(fieldClass)) {
                 field.set(targetObj, rs.getDouble(columnLabel));
             } else if ("Float".equals(fieldClass)) {
                 field.set(targetObj, rs.getFloat(columnLabel));
             } else if ("Integer".equals(fieldClass)) {
                 field.set(targetObj, rs.getInt(columnLabel));
             } else if ("Long".equals(fieldClass)) {
                 field.set(targetObj, rs.getLong(columnLabel));
             } else if ("BigDecimal".equals(fieldClass)) {
                 field.set(targetObj, rs.getBigDecimal(columnLabel));
             } else if ("Date".equals(fieldClass)) {
                 field.set(targetObj, rs.getDate(columnLabel));
             } else if ("Short".equals(fieldClass)) {
                 field.set(targetObj, rs.getShort(columnLabel));
             } else if ("Boolean".equals(fieldClass)) {
                 field.set(targetObj, rs.getBoolean(columnLabel));
             } else if ("Byte".equals(fieldClass)) {
                 field.set(targetObj, rs.getByte(columnLabel));
             } else if ("Timestamp".equals(fieldClass)) {
                 field.set(targetObj, rs.getTimestamp(columnLabel));
             } else if("BigDecimal".equals(fieldClass)) {
                 field.set(targetObj, rs.getBigDecimal(columnLabel));
             }else {
                 //这里没有实现，如有特殊需要处理的在这里实现
             }

         } catch (IllegalArgumentException e) {
             logger.error(e.getMessage(), e);
         } catch (IllegalAccessException e) {
             logger.error(e.getMessage(), e);
         } catch (SQLException e) {
             logger.error(e.getMessage(), e);
         }
     }

     private static String getFieldClaszName(Field field) {

         String elemType = field.getType().toString();
         if ("class java.lang.String".equals(elemType)
                 || elemType.indexOf("char") != -1
                 || elemType.indexOf("Character") != -1) {
             return "String";
         } else if (elemType.indexOf("double") != -1
                 || elemType.indexOf("Double") != -1) {
             return "Double";
         } else if (elemType.indexOf("float") != -1
                 || elemType.indexOf("Float") != -1) {
             return "Float";
         } else if (elemType.indexOf("int") != -1
                 || elemType.indexOf("Integer") != -1||elemType.indexOf("BigInteger") != -1) {
             return "Integer";
         } else if (elemType.indexOf("long") != -1
                 || elemType.indexOf("Long") != -1) {
             return "Long";
         } else if (elemType.indexOf("BigDecimal") != -1) {
             return "BigDecimal";
         } else if (elemType.indexOf("Date") != -1) {
             return "Date";
         } else if (elemType.indexOf("short") != -1
                 || elemType.indexOf("Short") != -1) {
             return "Short";
         } else if (elemType.indexOf("boolean") != -1
                 || elemType.indexOf("Boolean") != -1) {
             return "Boolean";
         } else if (elemType.indexOf("byte") != -1
                 || elemType.indexOf("Byte") != -1) {
             return "Byte";
         }  else if (elemType.indexOf("Timestamp") != -1) {
             return "Timestamp";
         }

         return "String";

     }

JdbcTemplateWrapper

package cn.com.mypm.framework.jdbc;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.util.Assert;

import cn.com.mypm.common.dto.PageModel;
import cn.com.mypm.framework.exception.DataBaseException;

/**
 *
* <p>标题:  JdbcTemplate 包装器</p>
* <p>业务描述:实现分页，原生结果集转对像，原生结果集字段名转脱峰java 属性名</p>
* <p>公司:itest.work</p>
* <p>版权:itest 2018</p>
* @author itest andy
* @date 2018年6月8日
* @version V1.0
 */
public class JdbcTemplateWrapper  {

    private static Log logger = LogFactory.getLog(JdbcTemplateWrapper.class);

    private JdbcTemplate jdbcTemplate;

    private String dbType = "mysql";

    private String showSql = "false";

    protected NamedParameterJdbcTemplate namedParameterJdbcTemplate;

    private String mysqlLowerCaseTableNames = null;

    public JdbcTemplateWrapper() {
        super();
    }

    public JdbcTemplateWrapper(JdbcTemplate jdbcTemplate) {
        super();
        this.jdbcTemplate = jdbcTemplate;
        this.namedParameterJdbcTemplate = new NamedParameterJdbcTemplate(jdbcTemplate);
    }

    public JdbcTemplateWrapper(JdbcTemplate jdbcTemplate, String dbType, String showSql) {
        super();
        this.jdbcTemplate = jdbcTemplate;
        this.dbType = dbType;
        this.namedParameterJdbcTemplate = new NamedParameterJdbcTemplate(jdbcTemplate);
        this.showSql = showSql;
    }

    public JdbcTemplate getJdbcTemplate() {
        return jdbcTemplate;
    }

    /**
     * 查询所有匹配的列表
     *
     * @param sql
     *            查询sql
     * @param className
     *            对象类型
     * @param args
     *            查询参数
     * @return
     * @author itest andy
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public List queryAllMatchList(String sql, Class clasz, Object[] args) {
        Assert.notNull(clasz, "clasz must not be null");
        List dataList = null;
        RowMapper rowMapper = new ObjectRowMapper(clasz);
        dataList = getJdbcTemplate().query(sql, args, rowMapper);
        ((ObjectRowMapper) rowMapper).clean();
        rowMapper = null;
        return dataList;
    }

    /**
     * 查询所有匹配的列表
     *
     * @param sql
     *            查询sql
     * @param className
     *            对象类型
     * @param args
     *            查询参数
     * @return
     * @author itest andy
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public List queryAllMatchListWithFreePra(String sql, Class clasz, Object... args) {
        Assert.notNull(clasz, "clasz must not be null");
        List dataList = null;
        RowMapper rowMapper = new ObjectRowMapper(clasz);
        dataList = getJdbcTemplate().query(sql, args, rowMapper);
        ((ObjectRowMapper) rowMapper).clean();
        rowMapper = null;
        return dataList;
    }

    /**
     * 把list map 原生JDBC结果集中，字段名，也就是MAP中的KEY，转换为驼峰规则的JAVA对属性名
     *
     * @param resultList ：JDBC 结果集
     * @return    把MAP中的KEY转换为转换为驼峰规则的JAVA对属性名的LIST<map<驼峰规则的JAVA对属性名形式的KEY,Object>>
     * @author itest andy
     */
    public void converDbColumnName2ObjectPropName(List<Map<String,Object>> resultList) {

        if(resultList!=null&&!resultList.isEmpty()) {
            List<Map<String,Object>> convertList=  new ArrayList<Map<String,Object>>(resultList.size());
             //用于缓存字段名到属性名的映射，第二条记录时就不再处理字段名到属性名的转换，提升性能
            Map<String,String> ColumnNamePropNameMap = null;
            if(resultList.size()>1) {
                ColumnNamePropNameMap = new HashMap<String,String>();
            }
            for(Map<String,Object> currMap :resultList) {
                 if(currMap!=null&&!currMap.isEmpty()) {
                     Iterator<Entry<String, Object>>   currentIt =  currMap.entrySet().iterator();
                     Map tempMap = new HashMap<String,Object>();
                     convertList.add(tempMap);
                     while(currentIt.hasNext()) {
                         Map.Entry<String,Object>  me=  currentIt.next();
                         String dbColumnName = me.getKey();
                         Object value = me.getValue();
                         if(resultList.size()>1) {
                             if(ColumnNamePropNameMap.get(dbColumnName)==null) {
                                 String currProName = convertColumnName2OFieldName(dbColumnName);
                                 tempMap.put(currProName, value);
                                 //缓存起来，第二条记录时就不再处理字段名到属性名的转换，提升性能
                                 ColumnNamePropNameMap.put(dbColumnName, currProName);
                             }else {
                                 tempMap.put(ColumnNamePropNameMap.get(dbColumnName), value);
                             }
                        }else {
                             tempMap.put(convertColumnName2OFieldName(dbColumnName), value);
                        }

                     }
                 }
            }
            resultList.clear();
            for(Map<String,Object> currMap:convertList) {
                resultList.add(currMap);
            }
            convertList.clear();
            convertList = null;

        }
    }

     public String convertColumnName2OFieldName(String columnName ) {

         if(mysqlLowerCaseTableNames == null){
            String lowerCaseNames = PropertiesBean.getInstance().getProperty("conf.mysql.lowerCaseNames");
            if(lowerCaseNames==null){
                mysqlLowerCaseTableNames = "yes";
            }else{
                mysqlLowerCaseTableNames = "no";
            }
        }
        if ("oracle".equals(dbType)||("mysql".equals(dbType)&&"no".equals(mysqlLowerCaseTableNames))) {
            columnName = columnName.toLowerCase();
        }
         if("true".equals(mysqlLowerCaseTableNames)) {
             columnName = columnName.toLowerCase();
         }

        StringBuffer buf = new StringBuffer();
        int i = 0;
        while ((i = columnName.indexOf('_')) > 0) {
            buf.append(columnName.substring(0, i));
            columnName = StringUtils.capitalize(columnName.substring(i + 1));
        }
        buf.append(columnName);
        return  buf.toString();
     }

    /**
     * 查询所有匹配的列表
     *
     * @param sql
     *            查询sql
     * @param className
     *            对象类型
     * @param paramMap
     *            查询参数
     * @return
     * @author itest andy
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public List queryAllMatchListWithParaMap(String sql, Class clasz, Map paramMap) {
        if (paramMap != null && paramMap.isEmpty()) {
            paramMap = null;
        }
        if ("true".equals(showSql)) {
            try {
                logger.info(getSqlFromQueryData(sql, paramMap));
            } catch (Exception e) {
                logger.error(e.getMessage(), e);
            }
        }
        List resultList = null;
        if (clasz == null) {
            resultList = namedParameterJdbcTemplate.queryForList(sql, paramMap);
        } else {
            RowMapper rowMapper = new ObjectRowMapper(clasz);
            resultList = namedParameterJdbcTemplate.query(sql, paramMap, rowMapper);
            ((ObjectRowMapper) rowMapper).clean();
            rowMapper = null;
        }

        return resultList;
    }

    /**
     *
     * @param pageModel:
     * @param className
     *            : 从查询结果集中构建出的类，如为null则pageModel的PageData为List<Map>，
     *            不为null则pageModel的PageData为List<className>
     * @param columnNameForCount:查询记录数时的字段名，一般用主键
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public void fillPageModelData(PageModel pageModel, Class className, String columnNameForCount) {
        if (pageModel.getHqlParamMap() != null && pageModel.getHqlParamMap().isEmpty()) {
            pageModel.setHqlParamMap(null);
        }
        if (pageModel.getTotal() == 0) {
            int totalRows = this.getResultCountWithValuesMap(pageModel.getQueryHql(), columnNameForCount,
                    pageModel.getHqlParamMap());
            pageModel.setTotal(totalRows);
        }
        if (pageModel.getTotal() == 0) {
            pageModel.setRows(new ArrayList());
            return;
        }
        if (pageModel.getPageNo() > 1) {
            int pageCount = this.getValidPage(pageModel.getPageNo(), pageModel.getTotal(), pageModel.getPageSize());
            if (pageCount < pageModel.getPageNo()) {
                pageModel.setPageNo(pageCount);
            }
        }

        int startRow = getStartOfPage(pageModel.getPageNo(), pageModel.getPageSize());

        String sql = this.buildPageSql(pageModel.getQueryHql(), startRow, pageModel.getPageSize());
        if ("true".equals(showSql)) {
            try {
                logger.info(getSqlFromQueryData(sql, pageModel.getHqlParamMap()));
            } catch (Exception e) {
                logger.error(e.getMessage(), e);
            }
        }
        List dataList = null;
        if (className == null) {
            dataList = namedParameterJdbcTemplate.queryForList(sql, pageModel.getHqlParamMap());
        } else {
            RowMapper rowMapper = new ObjectRowMapper(className);
            dataList = namedParameterJdbcTemplate.query(sql, pageModel.getHqlParamMap(), rowMapper);
            ((ObjectRowMapper) rowMapper).clean();
            rowMapper = null;
        }
        pageModel.setRows(dataList);
    }

    /**
     * 多表sql 分页查询,多表连查时，才用这个方法，其他请用commonDao的 SQL分页查询
     *
     * @param sql
     * @param className
     * @param paramMap
     * @param pageNo
     * @param PageSize
     * @param columnNameForCount
     * @return
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public List queryAllMatchListWithParaMap(String sql, Class clasz, Map paramMap, int pageNo, int pageSize,
            String columnNameForCount) {
        if (paramMap != null && paramMap.isEmpty()) {
            paramMap = null;
        }
        if ("true".equals(showSql)) {
            try {
                logger.info(getSqlFromQueryData(sql, paramMap));
            } catch (Exception e) {
                logger.error(e.getMessage(), e);
            }
        }
//         int totalRows = this.getResultCountWithValuesMap(sql,
//         columnNameForCount, paramMap);
//         if(pageNo>1){
//             int pageCount = this.getValidPage(pageNo, totalRows, pageSize);
//         }
        List resultList = null;

        int startRow = getStartOfPage(pageNo, pageSize);
        if (clasz == null) {
            resultList = namedParameterJdbcTemplate.queryForList(this.buildPageSql(sql, startRow, pageSize), paramMap);
        } else {
            RowMapper rowMapper = new ObjectRowMapper(clasz);
            resultList = namedParameterJdbcTemplate.query(this.buildPageSql(sql, startRow, pageSize), paramMap,
                    rowMapper);
            rowMapper = null;
        }
        return resultList;
    }

    private String buildPageSql(String sql, int startRow, int pageSize) {
        if ("oracle".equals(this.getDbType())) {
            return this.buildOraclePageSql(sql, startRow, pageSize);
        } else if ("mysql".equals(this.getDbType())) {
            return this.buildMysqlPageSql(sql, startRow, pageSize);
        } else if ("informix".equals(this.getDbType())) {
            return this.buildInformixPageSql(sql, startRow, pageSize);
        }
        throw new DataBaseException("don't support db type,please confirm db is oracle or mysql or informix");
    }

    private String buildOraclePageSql(String sql, int startRow, int pageSize) {
        StringBuilder pageSql = new StringBuilder("SELECT * FROM  ");
        pageSql.append(" ( ");
        pageSql.append(" SELECT pageDataTable.*, ROWNUM RNV ");
        pageSql.append(" FROM (" + sql + " ) pageDataTable ");
        pageSql.append(" WHERE ROWNUM <= " + (startRow + pageSize));
        pageSql.append(" )  WHERE RNV >= " + (startRow + 1));
        return pageSql.toString();
    }

    private String buildMysqlPageSql(String sql, int startRow, int pageSize) {
        sql = sql + " limit " + startRow + ", " + pageSize;
        return sql;
    }

    private String buildInformixPageSql(String sql, int startRow, int pageSize) {
        sql = sql.trim();
        if (sql.startsWith("select")) {
            sql = sql.replaceFirst("select", " select skip " + startRow + " first " + pageSize + " ");
        } else {
            sql = sql.replaceFirst("SELECT", " select skip " + startRow + " first " + pageSize + " ");
        }

        return sql;
    }

    private Integer getValidPage(Integer pageNo, int totalRows, Integer pageSize) {
        if (!isValidPage(pageNo, totalRows, pageSize)) {
            return getValidPage(--pageNo, totalRows, pageSize);
        }
        int pageCount = (totalRows + (pageSize - (totalRows % pageSize == 0 ? pageSize : totalRows % pageSize)))
                / pageSize;
        return pageCount;
    }

    private static int getStartOfPage(int pageNo, int pageSize) {
        if(pageNo==0){
            pageNo=1;
        }
        return (pageNo - 1) * pageSize;
    }

    private boolean isValidPage(Integer pageNo, Integer totalRows, Integer pageSize) {
        if (pageNo == 1) {
            return true;
        }
        int rowStart = (pageNo - 1) * pageSize;
        int rowEnd = rowStart + pageSize;
        if (rowEnd > totalRows) {
            rowEnd = totalRows;
        }
        return rowEnd > rowStart;
    }

    /**
     * 查询记录数
     *
     * @param sql
     * @param columnNameForCount
     * @param praValuesMap
     * @return
     */
    // @SuppressWarnings("deprecation")
    public int getResultCountWithValuesMap(String sql, String columnNameForCount, Map<String, Object> praValuesMap) {
        if (praValuesMap != null && praValuesMap.isEmpty()) {
            praValuesMap = null;
        }
        String countQuerySql = null;
        countQuerySql = " select count(*) from ( " + sql + " ) V_TABLE";
        return namedParameterJdbcTemplate.queryForInt(countQuerySql, praValuesMap);
    }

    public int queryForIntWithpraValuesMap(String countQuerySql, Map<String, Object> praValuesMap) {
        if (praValuesMap != null && praValuesMap.isEmpty()) {
            praValuesMap = null;
        }
        return namedParameterJdbcTemplate.queryForInt(countQuerySql, praValuesMap);
    }

    public int queryForInt(String countQuerySql, Object... args) {
        return getJdbcTemplate().queryForInt(countQuerySql, args);
    }

    public static String getSqlFromQueryData(String sql, Map<String, Object> paramMap) {
        if (StringUtils.isEmpty(sql)) {
            return null;
        }
        if (paramMap == null) {
            return sql;
        }
        StringBuffer sqlExp = new StringBuffer(sql);
        Set<Entry<String, Object>> set = paramMap.entrySet();
        for (Entry<String, Object> entry : set) {
            int start = sqlExp.indexOf(":" + entry.getKey() + " ");
            if (start < 0) {
                continue;
            }
            int last = sqlExp.lastIndexOf(":" + entry.getKey() + " ");

            if (start >= 0 && start == last) {
                if (entry.getValue() != null) {
                    sqlExp.replace(start, start + entry.getKey().length(), "'" + entry.getValue().toString() + "'");
                    // sqlExp.replace(start-1, start+entry.getKey().length(),
                    // "'"+entry.getValue().toString()+"'");
                }
            } else {
                // 处理同一参数多处出现
                sqlExp.replace(start, start + entry.getKey().length(), "'" + entry.getValue().toString() + "'");
                start = sqlExp.indexOf(":" + entry.getKey());
                while (start > 0) {
                    sqlExp.replace(start, start + entry.getKey().length(), "'" + entry.getValue().toString() + "'");
                    start = sqlExp.indexOf(":" + entry.getKey());
                }

            }

        }
        return sqlExp.toString();
    }

    private static String removeSelect(String sql) {
        int beginPos = sql.indexOf(" from ");
        if (beginPos < 0) {
            beginPos = sql.indexOf("from ");
        }
        if (beginPos < 0) {
            beginPos = sql.toLowerCase().indexOf(" from ");
        }
        if (beginPos < 0) {
            beginPos = sql.toLowerCase().indexOf("from ");
        }
        return sql.substring(beginPos);
    }

    /**
     * 去除sql的orderby 用于页查果询
     *
     * @param sql
     * @return
     */
    private static String removeOrders(String sql) {
        Pattern p = Pattern.compile("order\\s*by[\\w|\\W|\\s|\\S]*", Pattern.CASE_INSENSITIVE);
        Matcher m = p.matcher(sql);
        StringBuffer sb = new StringBuffer();
        while (m.find()) {
            m.appendReplacement(sb, "");
        }
        m.appendTail(sb);
        return sb.toString();
    }

    public String getDbType() {
        return dbType;
    }

    public NamedParameterJdbcTemplate getNamedParameterJdbcTemplate() {
        return namedParameterJdbcTemplate;
    }

    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
        this.namedParameterJdbcTemplate = new NamedParameterJdbcTemplate(jdbcTemplate);
    }

    public String getMysqlLowerCaseTableNames() {
        return mysqlLowerCaseTableNames;
    }

    public void setMysqlLowerCaseTableNames(String mysqlLowerCaseTableNames) {
        this.mysqlLowerCaseTableNames = mysqlLowerCaseTableNames;
    }

    public String isShowSql() {
        return showSql;
    }

    public void setShowSql(String showSql) {
        this.showSql = showSql;
    }

}

三：使用

数据源和JPA是同一数据源，在同一事务中，用的连接和JPA使用的是同一个连接，在CommonDao 额外注入一个  JdbcTemplateWrapper,当作处理复杂SQL的帮手。

JdbcTemplateWrapper  常用的方法同如下几个：

clasz 把查询结果要转为的类对像，内部再构造 ObjectRowMapper

1：public List queryAllMatchListWithFreePra(String sql, Class clasz, Object... args)  // SQL 参数为问号占位符，使用参数个数<=3 个时的情况,可以用要不参数多了，可变长参数多，阅读性差

2：public List queryAllMatchListWithParaMap(String sql, Class clasz, Map paramMap) // SQL 参数，为 参数名占位符 ,如 name=:name, paramMap中 key 为参数名，value 为值数值(用于参数个数多于3时，用参数名占位符的方式，然后用Map 传参) ; 如clasz 传为为空，实际返为 List<Map<String,Object>>,不为空侧为   List<Map<String,clasz>>

3：  以pageModel为载体实现分页

/**
     *
     * @param pageModel: 设置了查询SQL ，及查询参数 Map paramMap 的分页对像
     * @param className
     *            : 从查询结果集中构建出的类，如为null则pageModel的PageData为List<Map>，
     *            不为null则pageModel的PageData为List<className>
     * @param columnNameForCount:查询记录数时的字段名，一般用主键
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public void fillPageModelData(PageModel pageModel, Class className)

4  ： 不用 pageModel 分页查询

/**
     * 多表sql 分页查询,多表连查时，才用这个方法，其他请用commonDao的 SQL分页查询
     *
     * @param sql
     * @param className
     * @param paramMap
     * @param pageNo
     * @param PageSize
     * @param columnNameForCount
     * @return
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public List queryAllMatchListWithParaMap(String sql, Class clasz, Map paramMap, int pageNo, int pageSize)

5 ： 把list map 原生JDBC结果集中，字段名，也就是MAP中的KEY，转换为驼峰规则的JAVA对属性名

/**
     * 把list map 原生JDBC结果集中，字段名，也就是MAP中的KEY，转换为驼峰规则的JAVA对属性名
     * 方便前端组件使用，不再中间转为VO 或 实体类对像后，再返前端;比传统查询（多了一个LIST的遍历 ，基本对性能影响不大）
     * @param resultList ：JDBC 结果集
     * @return    把MAP中的KEY转换为转换为驼峰规则的JAVA对属性名的LIST<map<驼峰规则的JAVA对属性名形式的KEY,Object>>
     * @author itest andy
     */
    public void converDbColumnName2ObjectPropName(List<Map<String,Object>> resultList)