Java 通用存储过程ORMapping的实现 [真正实现篇]

在[基类实现篇]中,私有变量JxSpObject是真正的实现存储调用的一个类

实现代码:

import  java.lang.annotation. * ;
import  java.lang.reflect.Constructor;
import  java.lang.reflect.Field;
import  java.util. * ;
import  java.sql. * ;
import  com.sun.rowset. * ;

final   class  JxStoredProcedure
... {
    private String[] sqlTypeNames;
    private int[] sqlTypeVals;
    protected JxStoredProcedure()throws Exception
    ...{
        this.alAllParams = new ArrayList<JXVar>();
        this.alOutputParams = new ArrayList<JXVar>();//实际代码中并未使用,测试版本保留此集合
        this.getSqlTypes();
    }
    
    private void getSqlTypes()throws Exception
    ...{
        //java.sql.Types.VARCHAR ...        
        Field[] flds = Types.class.getFields();
        
        int idx = 0;        
        sqlTypeVals = new int[flds.length];
        sqlTypeNames= new String[flds.length];
        for(Field fld : flds)
        ...{            
            this.sqlTypeVals[idx] = Integer.parseInt(fld.get(null).toString());
            this.sqlTypeNames[idx] = fld.getName();
            idx += 1;
        }
    }
    
    //从名称[java.sql.Types.INTEGER],得到对应的数据,便于填充参数的类型
    private int getSqlTypeValue(String sqlTypeNAME)throws Exception
    ...{
        int iSqlTypeValue=0;
        int idx = 0;
        boolean bFlag = false;
        for(String str : this.sqlTypeNames)
        ...{
            if(sqlTypeNAME.indexOf(str)>-1)
            ...{
                iSqlTypeValue = this.sqlTypeVals[idx];
                bFlag = true;
                break;
            }
            idx += 1;
        }
        
        if(!bFlag)throw new Exception("检查是否参数类型是否正确...");
        
        return iSqlTypeValue;
    }
    
    public Object Exectue(Object InstanceClass)throws Exception
    ...{
        Object obj = null;
        this.IniSpData(InstanceClass);
        try
        ...{
            obj = this.doExecute(InstanceClass);
            if(this.jxReturn.Flag() == ReturnFlag.IsDataSet || this.jxReturn.Flag() == ReturnFlag.IsDouble)
            ...{
                return chRs;
            }
        }
        catch(Exception ex)
        ...{
            throw ex;
        }
        return obj;
    }
    
    public Object[] ExectueToObject(Object InstanceClass,Class InstanceType)throws Exception
    ...{
        Object obj = null;
        this.IniSpData(InstanceClass);
        try
        ...{
            obj = this.doExecute(InstanceClass);
            if(this.jxReturn.Flag() == ReturnFlag.IsDataSet || this.jxReturn.Flag() == ReturnFlag.IsDouble)
            ...{
                return JxConvert.ToObjectArray(InstanceType, chRs);
            }
        }
        catch(Exception ex)
        ...{
            throw ex;
        }
        return null;
    }
    
    private Object getPrivateFieldValue(Object obj, String PrivateFieldName)throws Exception
    ...{
        Field fld = obj.getClass().getDeclaredField(PrivateFieldName);
        fld.setAccessible(true);
        Object objVal = fld.get(obj);
        fld.setAccessible(false);
        
        return objVal;
    }
    
    private void setReturnFiledValue(Object obj, String PrivateFieldName,Object objResult)throws Exception
    ...{
        Field fld = obj.getClass().getDeclaredField(PrivateFieldName);
        fld.setAccessible(true);
        fld.set(obj, objResult);
        fld.setAccessible(false);
    }
    
    private String SPName;
    private JXExectueReturn jxReturn;
    private ArrayList<JXVar> alAllParams = null;
    private ArrayList<JXVar> alOutputParams = null;
    private void IniSpData(Object InstanceClass)throws Exception
    ...{
        //得到整个类上的 JXDatatSet 标注
        JXDatatSet jxDS = InstanceClass.getClass().getAnnotation(JXDatatSet.class);
        if(jxDS==null)throw new Exception("操作数据库发生错误:你必须使用 @JXDatatSet(...) 来标识类...");
        if(jxDS.schemaFlag() != SchemaFlag.IsStoredProcedure)throw new Exception("@JXDatatSet标识的类,不是有效的存储过程,请使用 SchemaFlag.IsStoredProcedure 来标识类...");
        
        //存储过程名称
        SPName = jxDS.SchemaName();
        
        //得到 .ctor 方法上的返回标注 JXExectueReturn
        Constructor[] ctorAry = InstanceClass.getClass().getDeclaredConstructors();
        for(Constructor ctor : ctorAry)
        ...{
            jxReturn = (JXExectueReturn)ctor.getAnnotation(JXExectueReturn.class);
            if(jxReturn == null)continue;            
        }
        if(jxReturn == null)throw new Exception("存储的实例类,至少在一个构造器上应用 @JXExectueReturn(...) 注释...");
        
        
        //得到整个类所有的私有变量的 JXVar 标注
        Field[] flds = InstanceClass.getClass().getDeclaredFields();
        for(Field fld : flds)
        ...{
            JXVar jxVar = fld.getAnnotation(JXVar.class);
            if(jxVar == null)continue;
            
            this.alAllParams.add(jxVar);
            if(jxVar.Flag() == VarIOFlag.IsOutput)this.alOutputParams.add(jxVar);
        }

    }
    
    private CachedRowSetImpl chRs;
    private int iReturnFlagValue;
    private Object doExecute(Object InstanceClass)throws Exception
    ...{
        Object objValue = null;
        
        String strSQL = "";
        for(int i=0;i<this.alAllParams.size();i++)strSQL += (strSQL.length()==0) ? "?" : ",?";
        
        if(strSQL.length()==0)strSQL = "call "+ this.SPName +"()";
        else strSQL = "call "+ this.SPName +"(" + strSQL + ")";
        
        this.iReturnFlagValue = this.jxReturn.Flag().getValue();
        switch(this.iReturnFlagValue)
        ...{
        case 0:    //IsDataSet
            strSQL = "{" + strSQL + "}";
            break;
        case 1:    //IsValue
            strSQL = "{? = " + strSQL + "}";
            break;
        case 2:    //IsNonResult
            strSQL = "{" + strSQL + "}";
            break;
        case 3: //IsDouble
            strSQL = "{? = " + strSQL + "}";
            break;
        }        
        //System.out.println(strSQL);
        
        Connection conn = JxContext.JxCurrentSession.JxConn;//本人实现的数据库上下文环境中得到连接
        conn.setAutoCommit(false);
        CallableStatement callStmt = conn.prepareCall(strSQL);
        
        int iParamIdx = 1;
        if(iReturnFlagValue != 2 && iReturnFlagValue != 0)
        ...{
            callStmt.registerOutParameter(iParamIdx, this.getSqlTypeValue(jxReturn.JavaSqlTypes()));
            iParamIdx += 1;
        }
        
        for(JXVar jxVar : this.alAllParams)
        ...{
            if(jxVar.Flag() == VarIOFlag.IsInput)
            ...{
                callStmt.setObject(iParamIdx, this.getPrivateFieldValue(InstanceClass,jxVar.PrivateFieldName()));
            }
            else if(jxVar.Flag() == VarIOFlag.IsOutput)
            ...{
                callStmt.registerOutParameter(iParamIdx, this.getSqlTypeValue(jxVar.JavaSqlTypes()));
            }
            else if(jxVar.Flag() == VarIOFlag.IsDouble)
            ...{
                callStmt.setObject(iParamIdx, this.getPrivateFieldValue(InstanceClass,jxVar.PrivateFieldName()));
                callStmt.registerOutParameter(iParamIdx, this.getSqlTypeValue(jxVar.JavaSqlTypes()));
            }
            
            
            iParamIdx += 1;
        }
        
        callStmt.execute();
        
        Object objResult = null;
        if(iReturnFlagValue == 1) //IsValue
        ...{
            iParamIdx = 2;
            objResult = callStmt.getObject(1);
            setReturnFiledValue(InstanceClass,jxReturn.PrivateFieldName(),objResult);
        }
        if(iReturnFlagValue == 0 || iReturnFlagValue==3) //IsDataSet,IsDouble
        ...{
            //具有结果集
            ResultSet rs = callStmt.getResultSet();
            chRs = new CachedRowSetImpl();
            chRs.populate(rs);
            rs.close();
            rs = null;
            
            //还具有返回值
            if(iReturnFlagValue==3)
            ...{
                iParamIdx = 2;
                objResult = callStmt.getObject(1);
                setReturnFiledValue(InstanceClass,jxReturn.PrivateFieldName(),objResult);
            }
        }
        
        //所有的输出参数进行赋值
        for(JXVar jxVar : this.alAllParams)
        ...{
            if(jxVar.Flag() == VarIOFlag.IsOutput || jxVar.Flag() == VarIOFlag.IsDouble)
            ...{
                Object objOut = callStmt.getObject(iParamIdx);
                this.setReturnFiledValue(InstanceClass,jxVar.PrivateFieldName(),objOut);
            }
            iParamIdx += 1;
        }

        callStmt.close();
        return objResult;
    }
}

此类,本人在实现时,实际上专写了一个接口,是通过此接口完成的,但此类现在是完成可以正常工作的

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anthor:[email protected]/[email protected]