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:

 

  1 package cn.com.mypm.framework.jdbc;
  2 
  3 import java.lang.reflect.Field;
  4 import java.sql.ResultSet;
  5 import java.sql.ResultSetMetaData;
  6 import java.sql.SQLException;
  7 import java.util.HashMap;
  8 import java.util.Map;
  9 import java.util.concurrent.ConcurrentHashMap;
 10 
 11 import org.apache.commons.logging.Log;
 12 import org.apache.commons.logging.LogFactory;
 13 import org.springframework.jdbc.core.RowMapper;
 14 import org.springframework.util.StringUtils;
 15 
 16 import cn.com.mypm.common.util.CalendaUtilities;
 17 import cn.com.mypm.framework.common.config.PropertiesBean;
 18 
 19 
 20 
 21 /**
 22  *
 23 * <p>标题: RowMapper 接口实现</p>
 24 * <p>业务描述:完成原生结果集到JAVA对像的转换</p>
 25 * <p>公司:itest.work</p>
 26 * <p>版权:itest 2018</p>
 27 * @author itest andy
 28 * @date 2018年6月8日
 29 * @version V1.0
 30  */
 31 @SuppressWarnings("rawtypes")
 32 public class ObjectRowMapper implements RowMapper {
 33 
 34     
 35     private Class<?> objectClass;
 36     private String[] columnNames = null;
 37     private Field[] fields ;
 38     ///缓存 当前结果集字对段和当前class的 Field的对应关系,
 39     private Map<String ,Field> currQueryFieldMap ;
 40     //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
 41     private Map<String ,String> fieldClassMap ;
 42     private Boolean isConvertSwitch  = null;
 43     // 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
 44     private String mysqlLowerCaseTableNames = null;
 45     private static Log logger = LogFactory.getLog(ObjectRowMapper.class);
 46     //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
 47     private static Map<String, Map<String, String>> dbColumnClassFieldMap = new ConcurrentHashMap<String, Map<String, String>>();
 48     
 49     public ObjectRowMapper(Class<?> objectClass) {
 50         this.objectClass = objectClass;
 51         fields = objectClass.getDeclaredFields();
 52     }
 53 
 54     public void clean(){
 55         if(currQueryFieldMap!=null){
 56             currQueryFieldMap.clear();
 57             currQueryFieldMap = null;
 58         }
 59         if(fieldClassMap!=null){
 60             fieldClassMap.clear();
 61             fieldClassMap = null;
 62         }
 63         if(fields!=null){
 64             fields = null;
 65         }
 66         if(columnNames!=null){
 67             columnNames = null;
 68         }
 69     }
 70     
 71     /**
 72      * 该方法自动将数据库字段对应到Object中相应字段 要求:
 73      * 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
 74      * 如user_name 转为userName ,如数据库字段名,无下划线
 75      * 就只能把首字母变为大小写后的 set ,get
 76      */
 77     @Override
 78     public Object mapRow(ResultSet rs, int rowNum) throws SQLException {
 79 
 80         Object targetObject = null;
 81         try {
 82             targetObject = objectClass.newInstance();
 83         } catch (InstantiationException | IllegalAccessException e) {
 84             logger.error(e.getMessage(), e);
 85         }
 86         if (columnNames == null) {
 87             ResultSetMetaData rsmd = rs.getMetaData();
 88             int columnCount = rsmd.getColumnCount();
 89             columnNames = new String[columnCount];
 90             for (int i = 0; i < columnCount; i++) {
 91                 columnNames[i] = rsmd.getColumnLabel(i + 1);
 92             }
 93         }
 94         isConvertSwitch = true;
 95 
 96         if(mysqlLowerCaseTableNames == null){
 97             String lowerCaseNames = PropertiesBean.getInstance().getProperty("conf.mysql.lowerCaseNames");
 98             if(lowerCaseNames==null){
 99                 mysqlLowerCaseTableNames = "yes";
100             }else{
101                 mysqlLowerCaseTableNames = "no";
102             }
103         }
104         if(currQueryFieldMap==null){
105             currQueryFieldMap = new HashMap<String,Field>(columnNames.length);
106             for (String columnName : columnNames) {
107                 for (Field field : fields) {
108                     if(isConvertSwitch==null){
109                         if (field.getName().equals(
110                                 convertColumnNameToFieldName(columnName))) {
111                             currQueryFieldMap.put(columnName, field);
112                             break;
113                         }
114                     }else{
115                         if(isConvertSwitch){
116                             if(targetObject instanceof  CustomRowMapper&&(!((CustomRowMapper)targetObject).isConvert())){
117                                 if (field.getName().equals(columnName)) {
118                                     currQueryFieldMap.put(columnName, field);
119                                     break;
120                                 }
121                             }else{
122                                 if (field.getName().equals(
123                                         convertColumnNameToFieldName(columnName))) {
124                                     currQueryFieldMap.put(columnName, field);
125                                     break;
126                                 }
127                             }
128                         }
129 
130                     }
131 
132                 }
133             }
134         }
135         for (String columnName : columnNames) {
136             Field field = currQueryFieldMap.get(columnName);
137             if(field==null){
138                 if(logger.isDebugEnabled()){
139                     logger.debug(objectClass.getName() +"is  not property match  db columnName:"+columnName );
140                 }
141                 continue;
142             }
143             Object value = rs.getObject(columnName);
144             if (value == null) {
145                 continue;
146             }
147             boolean accessFlag = field.isAccessible();
148             if (!accessFlag) {
149                 field.setAccessible(true);
150             }
151             if(fieldClassMap==null){
152                 fieldClassMap = new HashMap<String,String>(columnNames.length);
153             }
154             if(fieldClassMap.get(columnName)==null){
155                 fieldClassMap.put(columnName, getFieldClaszName(field));
156             }
157             setFieldValue(targetObject, field, rs, columnName,fieldClassMap.get(columnName));
158             // 恢复相应field的权限
159             if (!accessFlag) {
160                 field.setAccessible(accessFlag);
161             }
162         }
163         return targetObject;
164     }
165 
166 
167     public String convertColumnNameToFieldName(String columnName) {
168 
169         Map<String, String> fieldMap = dbColumnClassFieldMap.get(objectClass
170                 .getName());
171         boolean emptyFlg = false;
172         if (fieldMap == null) {
173             fieldMap = new HashMap<String, String>();
174             emptyFlg = true;
175         }
176 
177         String classFieldName = fieldMap.get(columnName);
178         if (classFieldName != null) {
179             return classFieldName;
180         }
181         String columnNameKey = columnName;
182 
183         //if ("oracle".equals(dbType)||("mysql".equals(dbType)&&"no".equals(mysqlLowerCaseTableNames))) {
184             columnName = columnName.toLowerCase();
185         //}
186 
187         StringBuffer buf = new StringBuffer();
188         int i = 0;
189         while ((i = columnName.indexOf('_')) > 0) {
190             buf.append(columnName.substring(0, i));
191             columnName = StringUtils.capitalize(columnName.substring(i + 1));
192         }
193         buf.append(columnName);
194         fieldMap.put(columnNameKey, buf.toString());
195         if (emptyFlg) {
196             dbColumnClassFieldMap.put(objectClass.getName(), fieldMap);
197         }
198         return fieldMap.get(columnNameKey);
199     }
200 
201     /**
202      * 根据类型对具体对象属性赋值
203      */
204     public static void setFieldValue(Object targetObj, Field field,
205             ResultSet rs, String columnLabel,String fieldClass) {
206 
207         try {
208             if ("String".equals(fieldClass)) {
209                 field.set(targetObj, rs.getString(columnLabel));
210             } else if ("Double".equals(fieldClass)) {
211                 field.set(targetObj, rs.getDouble(columnLabel));
212             } else if ("Float".equals(fieldClass)) {
213                 field.set(targetObj, rs.getFloat(columnLabel));
214             } else if ("Integer".equals(fieldClass)) {
215                 field.set(targetObj, rs.getInt(columnLabel));
216             } else if ("Long".equals(fieldClass)) {
217                 field.set(targetObj, rs.getLong(columnLabel));
218             } else if ("BigDecimal".equals(fieldClass)) {
219                 field.set(targetObj, rs.getBigDecimal(columnLabel));
220             } else if ("Date".equals(fieldClass)) {
221                 field.set(targetObj, rs.getDate(columnLabel));
222             } else if ("Short".equals(fieldClass)) {
223                 field.set(targetObj, rs.getShort(columnLabel));
224             } else if ("Boolean".equals(fieldClass)) {
225                 field.set(targetObj, rs.getBoolean(columnLabel));
226             } else if ("Byte".equals(fieldClass)) {
227                 field.set(targetObj, rs.getByte(columnLabel));
228             } else if ("Timestamp".equals(fieldClass)) {
229                 field.set(targetObj, rs.getTimestamp(columnLabel));
230             } else if("BigDecimal".equals(fieldClass)) {
231                 field.set(targetObj, rs.getBigDecimal(columnLabel));
232             }else {
233                 //这里没有实现,如有特殊需要处理的在这里实现
234             }
235             
236         } catch (IllegalArgumentException e) {
237             logger.error(e.getMessage(), e);
238         } catch (IllegalAccessException e) {
239             logger.error(e.getMessage(), e);
240         } catch (SQLException e) {
241             logger.error(e.getMessage(), e);
242         }
243     }
244 
245     private static String getFieldClaszName(Field field) {
246 
247         String elemType = field.getType().toString();
248         if ("class java.lang.String".equals(elemType)
249                 || elemType.indexOf("char") != -1
250                 || elemType.indexOf("Character") != -1) {
251             return "String";
252         } else if (elemType.indexOf("double") != -1
253                 || elemType.indexOf("Double") != -1) {
254             return "Double";
255         } else if (elemType.indexOf("float") != -1
256                 || elemType.indexOf("Float") != -1) {
257             return "Float";
258         } else if (elemType.indexOf("int") != -1
259                 || elemType.indexOf("Integer") != -1||elemType.indexOf("BigInteger") != -1) {
260             return "Integer";
261         } else if (elemType.indexOf("long") != -1
262                 || elemType.indexOf("Long") != -1) {
263             return "Long";
264         } else if (elemType.indexOf("BigDecimal") != -1) {
265             return "BigDecimal";
266         } else if (elemType.indexOf("Date") != -1) {
267             return "Date";
268         } else if (elemType.indexOf("short") != -1
269                 || elemType.indexOf("Short") != -1) {
270             return "Short";
271         } else if (elemType.indexOf("boolean") != -1
272                 || elemType.indexOf("Boolean") != -1) {
273             return "Boolean";
274         } else if (elemType.indexOf("byte") != -1
275                 || elemType.indexOf("Byte") != -1) {
276             return "Byte";
277         }  else if (elemType.indexOf("Timestamp") != -1) {
278             return "Timestamp";
279         }
280         
281         return "String";
282 
283     }

 

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)

 

posted @ 2019-04-15 13:31 itestAndy 阅读(...) 评论(...) 编辑 收藏