classname_autoid_get

This function returns the autoid of the object referenced by its class handle.

Prototype

 
    MCO_RET	classname_autoid_get(	/*IN*/classname * handle, 
                       /*OUT*/ autoid_t *oid );
 

Arguments

handle	The address of a variable of type class handle
oid	A pointer to an autoid_t, which will receive the autoid value of the object referenced by the handle

Description

This function will return the autoid of the object referenced by handle.

Return Codes

MCO_S_OK	The OID was returned successfully
MCO_E_TRANSACT	The transaction is in an error state
MCO_ERR_OBJECT_HANDLE	Invalid object handle

Example

The following code snippets demonstrate how classname_autoid_get() is used to retrieve the autoid value of a database object.

 
     
    Snippet from schema file:
            
     
    class Department
    {
        autoid[1000];
        string name;
        string code;
         
        unique tree<name> Iname;
        unique tree<code> Icode;
    };
 
    class Employee
    {
        string name;
        autoid_t dept;
         
        unique tree<name> Iname;
        unique tree<dept,name> Idept_name;
    };
     
    Application snippet:
            
     
    int main(int argc, char* argv[])
    {
        MCO_RET rc = MCO_S_OK;
        mco_db_h db;
        mco_trans_h t;
        char dept_code = "CS";
        Department dept;
         
        ...
        rc = mco_trans_start(db, MCO_READ_WRITE, MCO_TRANS_FOREGROUND, &t);
        if ( MCO_S_OK == rc ) 
         {
            rc = Department_Icode_find(t, dept_code, strlen(dept_code), &dept);
            if ( MCO_S_OK == rc ) 
             {
                Department dept;
                autoid_t autoid = 0;
                ...
                Department_autoid_get(&dept, &dept_id);
            
                ...
            }
        }
    }
 

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