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Reference Guide
TSQLColumnInfo.cxx
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1// @(#)root/net:$Id$
2// Author: Sergey Linev 31/05/2006
3
4/*************************************************************************
5 * Copyright (C) 1995-2006, Rene Brun and Fons Rademakers. *
6 * All rights reserved. *
7 * *
8 * For the licensing terms see $ROOTSYS/LICENSE. *
9 * For the list of contributors see $ROOTSYS/README/CREDITS. *
10 *************************************************************************/
11
12////////////////////////////////////////////////////////////////////////////////
13//
14// TSQLColumnInfo
15//
16// Contains information about single column from SQL table
17// Has following methods:
18// GetTypeName() - field type name in string form as it is reported by correspondent
19// database method. Some databases providing full type name like "numeric(20)",
20// other showing only "NUMERIC". As a result, one cannot use this string directly
21// to create new field of similar types in other table
22// IsNullable() - says if field value can be NULL or not
23// GetSQLType() - returns kind of sql type. Possible values:
24// TSQLServer::kSQL_NONE data type unknown
25// TSQLServer::kSQL_CHAR CHAR(n) - string with fixed length n
26// TSQLServer::kSQL_VARCHAR VARCHAR(n) - string with variable length upto n
27// TSQLServer::kSQL_INTEGER INTEGER, INT, TINYINT - any integer types
28// TSQLServer::kSQL_FLOAT FLOAT - float value
29// TSQLServer::kSQL_DOUBLE DOUBLE - double precision value
30// TSQLServer::kSQL_NUMERIC NUMERIC(n,s), NUMBER(n,s) - numeric values with length and precion
31// TSQLServer::kSQL_BINARY BLOB, VARBINARY - binary data (vriable or fixed size)
32// TSQLServer::kSQL_TIMESTAMP TIMESTAMP - time and date stamp
33// GetSize() - size of field in database. -1 if not known.
34// GetLength() - length argument in type declaration like CHAR(len) or NUMERIC(len), -1 if not defined
35// GetScale() - second argument in declarations like NUMERIC(len, s), -1 if not defined
36// GetSigned() - is type signed(==1) or unsigned(==0), -1 if not defined
37//
38////////////////////////////////////////////////////////////////////////////////
39
40#include "TSQLColumnInfo.h"
41#include "TSQLServer.h"
42#include "TROOT.h"
43#include "Riostream.h"
44
46
47////////////////////////////////////////////////////////////////////////////////
48/// default contructor
49
51 TNamed(),
52 fTypeName(),
53 fSQLType(-1),
54 fSize(-1),
55 fLength(-1),
56 fScale(-1),
57 fSigned(-1),
58 fNullable(kFALSE)
59{
60}
61
62////////////////////////////////////////////////////////////////////////////////
63/// normal constructor
64
65TSQLColumnInfo::TSQLColumnInfo(const char* columnname,
66 const char* sqltypename,
67 Bool_t nullable,
68 Int_t sqltype,
69 Int_t size,
71 Int_t scale,
72 Int_t sign) :
73 TNamed(columnname,"column information"),
74 fTypeName(sqltypename),
75 fSQLType(sqltype),
76 fSize(size),
77 fLength(length),
78 fScale(scale),
79 fSigned(sign),
80 fNullable(nullable)
81{
82}
83
84////////////////////////////////////////////////////////////////////////////////
85/// Prints column information to standard output
86
88{
90 std::cout << "Column: " << GetName()
91 << " type:'" << fTypeName << "'";
92 if (fSQLType>=0) {
93 std::cout << " typeid:";
94 switch (fSQLType) {
95 case TSQLServer::kSQL_CHAR : std::cout << "kSQL_CHAR"; break;
96 case TSQLServer::kSQL_VARCHAR : std::cout << "kSQL_VARCHAR"; break;
97 case TSQLServer::kSQL_INTEGER : std::cout << "kSQL_INTEGER"; break;
98 case TSQLServer::kSQL_FLOAT : std::cout << "kSQL_FLOAT"; break;
99 case TSQLServer::kSQL_DOUBLE : std::cout << "kSQL_DOUBLE"; break;
100 case TSQLServer::kSQL_NUMERIC : std::cout << "kSQL_NUMERIC"; break;
101 case TSQLServer::kSQL_BINARY : std::cout << "kSQL_BINARY"; break;
102 case TSQLServer::kSQL_TIMESTAMP : std::cout << "kSQL_TIMESTAMP"; break;
103 default: std::cout << fSQLType;
104 }
105 }
106 std::cout << " nullable:" << (fNullable ? "yes" : "no");
107 if (fSize>=0) std::cout << " size:" << fSize;
108 if (fLength>=0) std::cout << " len:" << fLength;
109 if (fScale>=0) std::cout << " scale:" << fScale;
110 if (fSigned>=0) {
111 if (fSigned==0)
112 std::cout << " unsigned";
113 else
114 std::cout << " signed";
115 }
116 std::cout << std::endl;
117}
size_t fSize
size_t size(const MatrixT &matrix)
retrieve the size of a square matrix
const Bool_t kFALSE
Definition: RtypesCore.h:101
const char Option_t
Definition: RtypesCore.h:66
#define ClassImp(name)
Definition: Rtypes.h:375
Option_t Option_t TPoint TPoint const char GetTextMagnitude GetFillStyle GetLineColor GetLineWidth GetMarkerStyle GetTextAlign GetTextColor GetTextSize void char Point_t Rectangle_t WindowAttributes_t Float_t Float_t Float_t Int_t Int_t UInt_t UInt_t Rectangle_t Int_t Int_t Window_t TString Int_t GCValues_t GetPrimarySelectionOwner GetDisplay GetScreen GetColormap GetNativeEvent const char const char dpyName wid window const char font_name cursor keysym reg const char only_if_exist regb h Point_t winding char text const char depth char const char Int_t count const char ColorStruct_t color const char Pixmap_t Pixmap_t PictureAttributes_t attr const char char ret_data h unsigned char height h length
The TNamed class is the base class for all named ROOT classes.
Definition: TNamed.h:29
const char * GetName() const override
Returns name of object.
Definition: TNamed.h:47
static void IndentLevel()
Functions used by ls() to indent an object hierarchy.
Definition: TROOT.cxx:2807
Int_t fSQLType
sql type name, as reported by DB. Should be as much as close to declaration of column in CREATE TABLE...
Int_t fSize
datatype code (see TSQLServer::ESQLDataTypes constants), -1 if not defeined
Bool_t fNullable
if datatype signed or not, 0 - kFALSE, 1 - kTRUE, -1 - unknown
void Print(Option_t *option="") const override
Prints column information to standard output.
Int_t fScale
datatype length definition, for instance VARCHAR(len) or FLOAT(len), -1 if not defined
Int_t fLength
size of column in bytes, -1 if not defing
TSQLColumnInfo()
identify if value can be NULL
Int_t fSigned
datatype scale factor, used for instance in NUMBER(len,scale) definition. -1 if not defined
@ kSQL_VARCHAR
Definition: TSQLServer.h:63
@ kSQL_TIMESTAMP
Definition: TSQLServer.h:69
@ kSQL_INTEGER
Definition: TSQLServer.h:64
@ kSQL_NUMERIC
Definition: TSQLServer.h:67
struct void * fTypeName
Definition: cppyy.h:9