/**
* 按主键查找一条数据
*
* @param lineCode 线路名称
* @return LineLossDto
* @throws Exception
*/
public LineLossDto findByPrimaryKey(String lineCode) throws Exception {
StringBuffer buffer = new StringBuffer(200);
// 拼SQL语句
buffer.append("SELECT ");
buffer.append("LineCode,");
buffer.append("R,");
buffer.append("LineLong,");
buffer.append("Volt,");
buffer.append("T,");
buffer.append("ValidStatus,");
buffer.append("Flag,");
buffer.append("Remark ");
buffer.append("FROM LineLoss ");
if (logger.isDebugEnabled()) {
StringBuffer debugBuffer = new StringBuffer(buffer.length() * 4);
debugBuffer.append(buffer.toString());
debugBuffer.append("WHERE ");
debugBuffer.append("LineCode=").append("'").append(lineCode).append("'");
logger.debug(debugBuffer.toString());
}
buffer.append("WHERE ");
buffer.append("LineCode = ?");
dbManager.prepareStatement(buffer.toString());
// 设置条件字段;
dbManager.setString(1, lineCode);
ResultSet resultSet = dbManager.executePreparedQuery();
LineLossDto lineLossDto = null;
if (resultSet.next()) {
lineLossDto = new LineLossDto();
lineLossDto.setLineCode(dbManager.getString(resultSet, 1));
lineLossDto.setR(dbManager.getDouble(resultSet, 2));
lineLossDto.setLineLong(dbManager.getDouble(resultSet, 3));
lineLossDto.setVolt(dbManager.getDouble(resultSet, 4));
lineLossDto.setT(dbManager.getDouble(resultSet, 5));
lineLossDto.setValidStatus(dbManager.getString(resultSet, 6));
lineLossDto.setFlag(dbManager.getString(resultSet, 7));
lineLossDto.setRemark(dbManager.getString(resultSet, 8));
}
resultSet.close();
return lineLossDto;
}
/**
* 按条件查询多条数据
*
* @param conditions 查询条件
* @param pageNo 页号
* @param rowsPerPage 每页的行数
* @return Collection
* @throws Exception
*/
public Collection findByConditions(String conditions, int pageNo, int rowsPerPage)
throws Exception {
StringBuffer buffer = new StringBuffer(200);
// 拼SQL语句
buffer.append("SELECT ");
buffer.append("LineCode,");
buffer.append("R,");
buffer.append("LineLong,");
buffer.append("Volt,");
buffer.append("T,");
buffer.append("ValidStatus,");
buffer.append("Flag,");
buffer.append("Remark ");
buffer.append("FROM LineLoss WHERE ");
buffer.append(conditions);
boolean supportPaging = false; // 数据库是否支持分页
if (pageNo > 0) {
// 对Oracle优化
if (dbManager
.getConnection()
.getMetaData()
.getDatabaseProductName()
.equalsIgnoreCase("Oracle")) {
buffer.insert(0, "SELECT * FROM ( SELECT row_.*, rownum rownum_ FROM (");
buffer.append(
") row_ WHERE rownum <= "
+ rowsPerPage * pageNo
+ ") WHERE rownum_ > "
+ rowsPerPage * (pageNo - 1));
supportPaging = true;
} else if (dbManager
.getConnection()
.getMetaData()
.getDatabaseProductName()
.equalsIgnoreCase("DB2")) {
String sql = buffer.toString();
buffer.setLength(0);
buffer.append("select * from ( select rownumber() over(");
int orderByIndex = sql.toLowerCase().indexOf("order by");
if (orderByIndex > 0) {
buffer.append(sql.substring(orderByIndex));
}
buffer.append(") as rownumber_,");
buffer.append(sql.substring(6));
buffer.append(" ) as temp_ where rownumber_");
buffer.append(
" between " + (rowsPerPage * (pageNo - 1) + 1) + " and " + rowsPerPage * pageNo);
supportPaging = true;
}
}
if (logger.isDebugEnabled()) {
logger.debug(buffer.toString());
}
ResultSet resultSet = dbManager.executeQuery(buffer.toString());
int count = 0;
if (supportPaging == false && pageNo > 1) {
dbManager.locate(resultSet, rowsPerPage * (pageNo - 1));
}
// 定义返回结果集合
Collection collection = new ArrayList(rowsPerPage);
LineLossDto lineLossDto = null;
while (resultSet.next()) {
if (supportPaging == false && pageNo > 0) {
count++;
if (count > rowsPerPage) {
break;
}
}
lineLossDto = new LineLossDto();
lineLossDto.setLineCode(dbManager.getString(resultSet, "LineCode"));
lineLossDto.setR(dbManager.getDouble(resultSet, "R"));
lineLossDto.setLineLong(dbManager.getDouble(resultSet, "LineLong"));
lineLossDto.setVolt(dbManager.getDouble(resultSet, "Volt"));
lineLossDto.setT(dbManager.getDouble(resultSet, "T"));
lineLossDto.setValidStatus(dbManager.getString(resultSet, "ValidStatus"));
lineLossDto.setFlag(dbManager.getString(resultSet, "Flag"));
lineLossDto.setRemark(dbManager.getString(resultSet, "Remark"));
collection.add(lineLossDto);
}
resultSet.close();
return collection;
}