Java反射实体组装SQL
之前在LIS.Core定义了实体特性，在LIS.Model给实体类加了表特性，属性特性，外键特性等。ORM要实现增删改查和查带外键的父表信息就需要解析Model的特性和实体信息组装SQL来供数据库驱动实现增删改查功能。
实现实体得到SQL的工具类，先实现一个得到查询SQL示例
package LIS.DAL.ORM.Common;
import LIS.Core.CustomAttributes.*;
import LIS.Core.Dto.*;
import LIS.Core.Dto.ParamDto;
import java.util.*;
import java.util.List;
import LIS.DAL.ORM.Common.TableInfo;
import LIS.DAL.ORM.DBUtility.IDbFactory;
import java.lang.annotation.Annotation;
import java.lang.reflect.*;
import LIS.DAL.ORM.Common.ColumnInfo;
import LIS.DAL.ORM.Common.TableInfo;
import LIS.Core.Util.ReflectUtil;
import LIS.Core.CustomAttributes.TableAttribute;
//通过实体类型得到SQL的工具类
public class ModelToSqlUtil {
//通过实体对象得到表信息
public static TableInfo GetTypeInfo(Object model) {
if (model == null) {
return null;
}
try {
//返回的对象
TableInfo tableInfo = new TableInfo();
Class c = model.getClass();
System.out.println("111");
//得到表特性
Annotation[] annoList = c.getAnnotations();
if (annoList != null && annoList.length > 0) {
for (int i = 0; i < annoList.length; i++) {
//表特性
if (annoList[i] instanceof TableAttribute) {
tableInfo.TableInfo = (TableAttribute) annoList[i];
}
//唯一特性
else {
tableInfo.UniqueList.add((UniqueAttribute) annoList[i]);
}
}
}
//得到列信息
Field[] declaredFields = c.getDeclaredFields();
for (int i = 0; i < declaredFields.length; i++) {
LIS.DAL.ORM.Common.ColumnInfo col = new LIS.DAL.ORM.Common.ColumnInfo();
FrekeyAttribute fk = declaredFields[i].getAnnotation(FrekeyAttribute.class);
col.FkInfo = fk;
col.Name = declaredFields[i].getName();
col.ColType = declaredFields[i].getType();
col.Value = declaredFields[i].get(model);
tableInfo.ColList.add(col);
}
return tableInfo;
} catch (Exception ex) {
ex.printStackTrace();
}
return null;
}
//通过表信息和参数列表组装查询SQL
//factory:驱动工厂
//tableInfo:表信息
//para:参数
//operList:参数对应的操作符列表
//linkList:多个参数之间连接的操作符 and or这种
//orderBySql:Order By的SQL语句
//IsFk:是否组装外键查询的SQL
public static String GetSelectSqlByTableInfo(IDbFactory factory,TableInfo tableInfo, List<ParamDto> para,List<String> operList,List<String> linkList, String orderBySql,Boolean IsFk)
{
StringBuilder sb=new StringBuilder();
sb.append("select ");
//是否含有序号列
boolean HasSequence=false;
boolean HasSeqNum=false;
//组装查询列
for(int i=0;i<tableInfo.ColList.size();i++)
{
//存列名
String columnName = tableInfo.ColList.get(i).Name;
if(columnName=="Sequence")
{
HasSequence=true;
}
else if(columnName=="SeqNum")
{
HasSeqNum=true;
}
//组装查询列
if(i==0)
{
sb.append(factory.DealPropertyName(columnName));
}
else
{
sb.append(","+factory.DealPropertyName(columnName));
}
//组装外键查询信息
if(IsFk==true&&tableInfo.ColList.get(i).FkInfo!=null) {
FrekeyAttribute fkAttr=tableInfo.ColList.get(i).FkInfo;
String refTableName=factory.DealTableName(GetTableName(ReflectUtil.GetType("LIS.Model.Entity." + fkAttr.Name(), "LIS.Model")));
sb.append("," + "(select " + factory.DealPropertyName(fkAttr.AssociaField()) + " from " + refTableName + " where ti." + factory.DealPropertyName(columnName) + "=" + refTableName + "." + factory.DealPropertyName(fkAttr.RefColumnName()) + ") as " + factory.DealPropertyName(columnName + "_" + fkAttr.Name() + "_" + fkAttr.AssociaField()));
//如果有拉取字段1，查询拉取字段
if (fkAttr.AssociaField1() != "")
{
sb.append("," + "(select " + factory.DealPropertyName(fkAttr.AssociaField1()) + " from " + refTableName + " where ti." + factory.DealPropertyName(columnName) + "=" + refTableName + "." + factory.DealPropertyName(fkAttr.RefColumnName()) + ") as " + factory.DealPropertyName(columnName + "_" + fkAttr.Name() + "_" + fkAttr.AssociaField1()));
}
//如果有拉取字段2，查询拉取字段
if (fkAttr.AssociaField2() != "")
{
sb.append("," + "(select " + factory.DealPropertyName(fkAttr.AssociaField2()) + " from " + refTableName + " where ti." + factory.DealPropertyName(columnName) + "=" + refTableName + "." + factory.DealPropertyName(fkAttr.RefColumnName()) + ") as " + factory.DealPropertyName(columnName + "_" + fkAttr.Name() + "_" + fkAttr.AssociaField2()));
}
}
}
sb.append(" from " + factory.DealTableName(tableInfo.TableInfo.Name()) + " ti ");
//组装查询参数
if(para!=null&¶.size()>0)
{
sb.append(" where ");
for(int i=0;i<para.size();i++)
{
String oper="=";
if(operList!=null&&operList.size()>i)
{
oper=operList.get(i);
}
String link="and";
if(operList!=null&&operList.size()>i-1)
{
link=operList.get(i-1);
}
if(i==0) {
sb.append(factory.DealPropertyName(para.get(i).Key.toString()) + oper + factory.DealSqlPara(para.get(i).Key.toString()));
}
else
{
sb.append(" "+link+" "+factory.DealPropertyName(para.get(i).Key.toString()) + oper + factory.DealSqlPara(para.get(i).Key.toString()));
}
}
}
//存组装的排序sql
String strSort = "";
//如果传入了排序字段，组装排序语句
if (orderBySql != null && orderBySql.length() > 0)
{
//用来存处理的排序串
String dealStr = "";
//先分割多个排序条件
String[] strList = orderBySql.split(",");
for (int m = 0; m < strList.length; m++)
{
//分开多个排序条件
if (m > 0)
{
dealStr += ",";
}
//分开字段名称和升降序
String[] strSubList = strList[m].split(" ");
//处理字段名称
dealStr += factory.DealPropertyName(strSubList[0]);
//组装处理的串
for (int n = 1; n < strSubList.length; n++)
{
dealStr += " " + strSubList[n];
}
}
//组装排序串
strSort = " Order By " + dealStr;
}
else
{
if (HasSequence)
{
strSort = " Order By " + factory.DealPropertyName("Sequence") + " ASC";
}
else if (HasSeqNum)
{
strSort = " Order By " + factory.DealPropertyName("SeqNum") + " ASC";
}
else
{
strSort = "";
}
}
sb.append(strSort);
return sb.toString();
}
//通过实体类型得到实体表名称
private static String GetTableName(Class c)
{
//存表名
String strTableName = "";
//得到表特性
TableAttribute tableInfo = null;
//得到表特性
Annotation[] annoList = c.getAnnotations();
if (annoList != null && annoList.length > 0) {
for (int i = 0; i < annoList.length; i++) {
//表特性
if (annoList[i] instanceof TableAttribute) {
tableInfo = (TableAttribute) annoList[i];
strTableName=tableInfo.Name();
break;
}
}
}
return strTableName;
}
}
定义的表信息实体
解析的列信息
package LIS.DAL.ORM.Common;
import LIS.Core.CustomAttributes.FrekeyAttribute;
import java.lang.reflect.Type;
//列信息
public class ColumnInfo {
//存外键信息
public FrekeyAttribute FkInfo=null;
//存列名
public String Name;
//存列结果
public Object Value;
//存列的类型
public Type ColType;
}
解析的id信息
package LIS.DAL.ORM.Common;
//存主键信息
public class IdInfo {
/// 解析的表信息
package LIS.DAL.ORM.Common;
import LIS.Core.CustomAttributes.*;
import java.util.*;
import LIS.DAL.ORM.Common.ColumnInfo;
//存解析的表新
public class TableInfo {
//存唯一的特性
public List<UniqueAttribute> UniqueList=new ArrayList<UniqueAttribute>();
//表特性
public TableAttribute TableInfo=null;
//主键信息
public LIS.DAL.ORM.Common.IdInfo ID=null;
//存列信息
public List<ColumnInfo> ColList=new ArrayList<ColumnInfo>();
}
测试
控制台测试
package com.company;
//import org.apache.commons.configuration.ConfigurationException;
//import org.apache.commons.configuration.PropertiesConfiguration;
import LIS.Model.Entity.SYSForm;
import LIS.Model.Entity.SYSUser;
import org.w3c.dom.*;
import javax.xml.parsers.*;
import java.io.*;
import java.net.URL;
public class Main {
public static void main(String[] args) {
//用容器的配置xml初始化容器
LIS.Core.Context.ObjectContainer.InitIoc();
//ORM通过容器取数据库驱动工厂
LIS.DAL.ORM.EntityManager.EntityManagerImpl orm=new LIS.DAL.ORM.EntityManager.EntityManagerImpl();
//执行查询测试
orm.DBSelectTest();
//测试通过实体得到SQL语句
orm.InsertSqlTest(new SYSForm());
orm.InsertSqlTest(new SYSUser());
}
}
测试查询外键的sql
select "RowID","Code","CName","SysCode","Sequence","Active","Url","Path","Remark","FormHelp","HelpWidth","HelpHeight","HelpDoc","SystemSubDR",(select "RowID" from dbo.SYS_SystemSub where ti."SystemSubDR"=dbo.SYS_SystemSub."RowID") as "SystemSubDR_SYSSystemSub_RowID",(select "" from dbo.SYS_SystemSub where ti."SystemSubDR"=dbo.SYS_SystemSub."RowID") as "SystemSubDR_SYSSystemSub_",(select "" from dbo.SYS_SystemSub where ti."SystemSubDR"=dbo.SYS_SystemSub."RowID") as "SystemSubDR_SYSSystemSub_" from dbo.SYS_Form ti Order By "Sequence" ASC
select "RowID","Code","CName","Password","HospitalDR",(select "CName" from dbo.BT_Hospital where ti."HospitalDR"=dbo.BT_Hospital."RowID") as "HospitalDR_BTHospital_CName",(select "" from dbo.BT_Hospital where ti."HospitalDR"=dbo.BT_Hospital."RowID") as "HospitalDR_BTHospital_",(select "" from dbo.BT_Hospital where ti."HospitalDR"=dbo.BT_Hospital."RowID") as "HospitalDR_BTHospital_","LanguageDR",(select "CName" from dbo.SYS_Language where ti."LanguageDR"=dbo.SYS_Language."RowID") as "LanguageDR_SYSLanguage_CName",(select "" from dbo.SYS_Language where ti."LanguageDR"=dbo.SYS_Language."RowID") as "LanguageDR_SYSLanguage_",(select "" from dbo.SYS_Language where ti."LanguageDR"=dbo.SYS_Language."RowID") as "LanguageDR_SYSLanguage_","SecurityType","PIN","Remark","Sequence","Active","PositionTitleDR",(select "CName" from dbo.BT_PositionTitle where ti."PositionTitleDR"=dbo.BT_PositionTitle."RowID") as "PositionTitleDR_BTPositionTitle_CName",(select "" from dbo.BT_PositionTitle where ti."PositionTitleDR"=dbo.BT_PositionTitle."RowID") as "PositionTitleDR_BTPositionTitle_",(select "" from dbo.BT_PositionTitle where ti."PositionTitleDR"=dbo.BT_PositionTitle."RowID") as "PositionTitleDR_BTPositionTitle_","UserType","UKeyNo","SignImage","Theme","MenuModel","PermissionDR",(select "CName" from dbo.SYS_Permission where ti."PermissionDR"=dbo.SYS_Permission."RowID") as "PermissionDR_SYSPermission_CName",(select "" from dbo.SYS_Permission where ti."PermissionDR"=dbo.SYS_Permission."RowID") as "PermissionDR_SYSPermission_",(select "" from dbo.SYS_Permission where ti."PermissionDR"=dbo.SYS_Permission."RowID") as "PermissionDR_SYSPermission_" from dbo.SYS_User ti Order By "Sequence" ASC
支持SQL组装的基础雏形完成了，Maven的依赖实在是太无语了，一会儿IDE提示代码不行的时候Maven编译又可以。一会儿IDE提示可以的时候Maven有编译不行，摸不着规律，工程换Jboss工程了，工程引用浪费大量时间，弃用Maven工程后引用依赖稳定了