//首先说下思路：1.通过反射获取所有字段信息，获取注解的信息（包括表名，列名，列的类型等）
// 2.然后传递过来一个list结果集合，通过一些简单的计算和逻辑控制，生成对应的sql语句用stringBuff er拼接。
// 3.关键点：每次在循环这个list结果集合的时候，调用List.subList(0, resultList.size()).clea r();该方法，可以每次清除掉你本次已经走过的步长的数据。这样经过每次的迭代，最终集合的数据越 来越少，从而提高效率。
/**
*
* 功能说明：通过反射获取集合的值，并构建insert语句
*
* @author: 吕兵阳
* @param theCalcResult 要保存的数据集合
* @throws Exception
* @return 返回本次执行的sql添加语句
* @DATE:2014-10-17 @TIME: 下午12:57:31
*/
private String optionTheCalcResultList(
List<?> theCalcResult) throws Exception {
if (theCalcResult == null || theCalcResult.isEmpty()) {
// 过滤为空的直接return
return null;
}
// 初始化一个map，保存<columnName,fieldName>的信息
Map<String, String> resultMap = new HashMap<String, String>();
// 声明保存列的集合
List<String> columnList = new ArrayList<String>();
// 声明表名
String tabName = "";
// 获取当前传入对象的全类名
String className = theCalcResult.get(0).getClass().getName();
// 用于存储标记是时间类型的列名<columnName,columnType>
Map<String, String> markDateCol = new HashMap<String, String>();
Class<?> c = null;// 声明当前传入的结果集类
c = ClassUtils.getClass(className);// 得到当前传入的结果集类
if (c.isAnnotationPresent(Table.class)) {
// 得到类的注解
Annotation claAnno = c.getAnnotation(Table.class);
Object objTab = org.springframework.core.annotation.AnnotationUtils
.getValue(claAnno, "name");
if (objTab == null) {
logger.debug("*************没有注解信息**************");
return null;
}
tabName = objTab.toString();// 表名
}
// 得到当前结果集中主表类的所有字段
Field[] f = c.getDeclaredFields();
for (Field field : f) {
if (field.isAnnotationPresent(Column.class)) {
Annotation anno = field.getAnnotation(Column.class);
Object objColumn = org.springframework.core.annotation.AnnotationUtils
.getValue(anno, "name");
if (objColumn == null) {
continue;
}
// 得到字段的属性
Class<?> wordType = field.getType();
// 判断字段是否是时间类型
if (wordType.equals(java.util.Date.class)) {
markDateCol.put(objColumn.toString(), field.getName());
}
resultMap.put(objColumn.toString(), field.getName());
columnList.add(objColumn.toString());
}
}
List<Class<?>> css = ClassUtils.getAllSuperclasses(c);// 得到当前传入的结果集类的所有父类集合
// 得到当前传入的结果集类的所有父类集合的所有字段
for (Class<?> class1 : css) {
Field[] fs = class1.getDeclaredFields();
for (Field field : fs) {
if (field.isAnnotationPresent(Column.class)) {
Annotation anno = field.getAnnotation(Column.class);
Object suObjColumn = org.springframework.core.annotation.AnnotationUtils
.getValue(anno, "name");
if (suObjColumn == null) {
continue;
}
// 得到字段的属性
Class<?> wordType = field.getType();
// 判断字段是否是时间类型
if (wordType.equals(java.util.Date.class)) {
markDateCol
.put(suObjColumn.toString(), field.getName());
}
columnList.add(suObjColumn.toString());
resultMap.put(suObjColumn.toString(), field.getName());
}
}
}
DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
StringBuffer sb = new StringBuffer();
// 要返回的sql语句的string缓冲类
StringBuffer inSql = new StringBuffer();
Object value = null;
List<String> columns = new ArrayList<String>();// 列的集合
for (int i = 0; i < theCalcResult.size(); i++) {
sb.append("(select ");
int j = 0;
for (String columnName : columnList) {
j++;
String fieldName = resultMap.get(columnName);
String firstLetter = fieldName.substring(0, 1).toUpperCase(); // 获得字段第一个字母大写
String getMethodName = "get" + firstLetter
+ fieldName.substring(1); // 转换成字段的get方法
Method getMethod = c.getMethod(getMethodName, new Class[] {});
value = getMethod.invoke(theCalcResult.get(i), new Object[] {});
if ("ID".equals(columnName)) {
value = "sys_guid()";
} else if (markDateCol.containsKey(columnName)) {
value = value == null ? null : (Date) value;
value = df.format(value);
value = "to_date('" + value + "','yyyy-mm-dd hh24:mi:ss')";
} else {
value = value == null ? "null" : "'" + value + "'";
}
if (columns.size() < columnList.size()) {
columns.add(columnName);
}
if (j == columnList.size()) {
if ((i + 1) != theCalcResult.size()) {
sb.append(value + " from dual) union all ");
} else {
sb.append(value + " from dual)");
}
} else {
sb.append(value + ", ");
}
}
}
if (StringUtils.isBlank(inSql)) {
inSql.append("insert into " + tabName + "( ");
inSql.append(StringUtils.join(columns.toArray(), ",") + " )");
}
inSql.append(sb);
logger.debug("输出的sql语句：" + inSql.toString());
return inSql.toString();
}
public boolean saveResult(List<?> resultList) {
int step = 3;//步长
int commitCount = resultList.size() / step;//分几次执行
int remainderNumber = resultList.size() % step;//是否有余数
if (remainderNumber != 0) {
commitCount++;
}
logger.debug("#################saveResult方法begin#################");
logger.debug("总共：" + resultList.size() + "条");
String[] sqlArray = new String[commitCount];
for (int i = 0; i < sqlArray.length; i++) {
List<Object> tempList = new ArrayList<Object>();
if (!resultList.isEmpty()) {
for (int j = 0; j < step; j++) {
if (step > resultList.size()) {
break;
}
tempList.add(resultList.get(j));
}
if (step > resultList.size()) {
for (int j = 0; j < resultList.size(); j++) {
tempList.add(resultList.get(j));
}
}
}
try {
sqlArray[i] = this.optionTheCalcResultList(tempList);
logger.debug("步长为:" + step + ",分：" + commitCount + "次执行，本次执行第："
+ i + "次");
} catch (Exception e) {
logger.debug("####################构建sql语句出错##########################");
new EagleException("系统错误，请联系管理员！");
}
if (!resultList.isEmpty()) {
if (step > resultList.size()) {
resultList.subList(0, resultList.size()).clear();
} else {
resultList.subList(0, step).clear();
}
}
}
this.getJdbcTemplate().batchUpdate(sqlArray);//调用spring的批量保存
logger.debug("#################saveResult方法end#################");
return true;
}
下面为打印的logger日志：
2014-10-18 23:31:48,327 TheoCalcDomainBaseService - #################saveResult方法begin#################
2014-10-18 23:31:48,334 TheoCalcDomainBaseService - 总共：10条
2014-10-18 23:31:48,395 TheoCalcDomainBaseService - 输出的sql语句：insert into LLT_TRANPSRRESULT( PART_INDEX,PSR_ID,DATA_TIME,CALC_TIME,CALC_PERIOD,ID,YEARMONTH,COMPANY_ID,COMPANY_NAME )(select null, null, to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), '0', sys_guid(), null, '单位id0', '单位测试name0' from dual) union all (select null, null, to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), '1', sys_guid(), null, '单位id1', '单位测试name1' from dual) union all (select null, null, to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), '2', sys_guid(), null, '单位id2', '单位测试name2' from dual)
2014-10-18 23:31:48,396 TheoCalcDomainBaseService - 步长为:3,分：4次执行，本次执行第：0次
2014-10-18 23:31:48,401 TheoCalcDomainBaseService - 输出的sql语句：insert into LLT_TRANPSRRESULT( PART_INDEX,PSR_ID,DATA_TIME,CALC_TIME,CALC_PERIOD,ID,YEARMONTH,COMPANY_ID,COMPANY_NAME )(select null, null, to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), '3', sys_guid(), null, '单位id3', '单位测试name3' from dual) union all (select null, null, to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), '4', sys_guid(), null, '单位id4', '单位测试name4' from dual) union all (select null, null, to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), '5', sys_guid(), null, '单位id5', '单位测试name5' from dual)
2014-10-18 23:31:48,404 TheoCalcDomainBaseService - 步长为:3,分：4次执行，本次执行第：1次
2014-10-18 23:31:48,407 TheoCalcDomainBaseService - 输出的sql语句：insert into LLT_TRANPSRRESULT( PART_INDEX,PSR_ID,DATA_TIME,CALC_TIME,CALC_PERIOD,ID,YEARMONTH,COMPANY_ID,COMPANY_NAME )(select null, null, to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), '6', sys_guid(), null, '单位id6', '单位测试name6' from dual) union all (select null, null, to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), '7', sys_guid(), null, '单位id7', '单位测试name7' from dual) union all (select null, null, to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), '8', sys_guid(), null, '单位id8', '单位测试name8' from dual)
2014-10-18 23:31:48,410 TheoCalcDomainBaseService - 步长为:3,分：4次执行，本次执行第：2次
2014-10-18 23:31:48,412 TheoCalcDomainBaseService - 输出的sql语句：insert into LLT_TRANPSRRESULT( PART_INDEX,PSR_ID,DATA_TIME,CALC_TIME,CALC_PERIOD,ID,YEARMONTH,COMPANY_ID,COMPANY_NAME )(select null, null, to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), to_date('2014-10-18 23:31:48','yyyy-mm-dd hh24:mi:ss'), '9', sys_guid(), null, '单位id9', '单位测试name9' from dual)
2014-10-18 23:31:48,412 TheoCalcDomainBaseService - 步长为:3,分：4次执行，本次执行第：3次
2014-10-18 23:31:48,412 TheoCalcDomainBaseService - #################saveResult方法end#################
