1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
/********************************************************************
* SQLColumns
*
* This is something of a mess. Part of the problem here is that msqlListFields
* are returned as mSQL 'column headers'... we want them to be returned as a
* row for each. So we have to turn the results on their side <groan>.
*
* Another problem is that msqlListFields will also return indexs. So we have
* to make sure that these are not included here.
*
* The end result is more code than what would usually be found here.
*
**********************************************************************
*
* This code was created by Peter Harvey (mostly during Christmas 98/99).
* This code is LGPL. Please ensure that this message remains in future
* distributions and uses of this code (thats about all I get out of it).
* - Peter Harvey pharvey@codebydesign.com
*
********************************************************************/
#include "driver.h"
enum nSQLColumns
{
TABLE_CAT = 1,
TABLE_SCHEM,
TABLE_NAME,
COLUMN_NAME,
DATA_TYPE,
TYPE_NAME,
COLUMN_SIZE,
BUFFER_LENGTH,
DECIMAL_DIGITS,
NUM_PREC_RADIX,
NULLABLE,
REMARKS,
COLUMN_DEF,
SQL_DATA_TYPE,
SQL_DATETIME_SUB,
CHAR_OCTET_LENGTH,
ORDINAL_POSITION,
IS_NULLABLE,
COL_MAX
};
m_field aSQLColumns[] =
{
"", "", 0, 0, 0,
"TABLE_CAT", "sys", CHAR_TYPE, 50, 0,
"TABLE_SCHEM", "sys", CHAR_TYPE, 50, 0,
"TABLE_NAME", "sys", CHAR_TYPE, 50, 0,
"COLUMN_NAME", "sys", CHAR_TYPE, 50, 0,
"DATA_TYPE", "sys", INT_TYPE, 3, 0,
"TYPE_NAME", "sys", CHAR_TYPE, 50, 0,
"COLUMN_SIZE", "sys", INT_TYPE, 3, 0,
"BUFFER_LENGTH", "sys", INT_TYPE, 3, 0,
"DECIMAL_DIGITS", "sys", INT_TYPE, 3, 0,
"NUM_PREC_RADIX", "sys", INT_TYPE, 3, 0,
"NULLABLE", "sys", INT_TYPE, 3, 0,
"REMARKS", "sys", CHAR_TYPE, 50, 0,
"COLUMN_DEF", "sys", CHAR_TYPE, 50, 0,
"SQL_DATA_TYPE", "sys", INT_TYPE, 3, 0,
"SQL_DATETIME_SUB", "sys", INT_TYPE, 3, 0,
"CHAR_OCTET_LENGTH","sys", INT_TYPE, 3, 0,
"ORDINAL_POSITION", "sys", CHAR_TYPE, 50, 0,
"IS_NULLABLE", "sys", CHAR_TYPE, 50, 0
};
SQLRETURN SQLColumns( SQLHSTMT hDrvStmt,
SQLCHAR *szCatalogName,
SQLSMALLINT nCatalogNameLength,
SQLCHAR *szSchemaName,
SQLSMALLINT nSchemaNameLength,
SQLCHAR *szTableName,
SQLSMALLINT nTableNameLength,
SQLCHAR *szColumnName,
SQLSMALLINT nColumnNameLength )
{
HDRVSTMT hStmt = (HDRVSTMT)hDrvStmt;
m_result *pResults; /* mSQL DATA */
m_field *pField; /* mSQL field */
COLUMNHDR *pColumnHeader;
int nColumn;
long nCols;
long nRow;
long nCurRow;
char szBuffer[101];
int nIndexColumns = 0;
/* SANITY CHECKS */
if( NULL == hStmt )
return SQL_INVALID_HANDLE;
sprintf( hStmt->szSqlMsg, "hStmt = $%08lX", hStmt );
logPushMsg( hStmt->hLog, __FILE__, __FILE__, __LINE__, LOG_WARNING, LOG_WARNING, hStmt->szSqlMsg );
if ( szTableName == NULL || szTableName[0] == '\0' )
{
logPushMsg( hStmt->hLog, __FILE__, __FILE__, __LINE__, LOG_WARNING, LOG_WARNING, "SQL_ERROR Must supply a valid table name" );
return SQL_ERROR;
}
/**************************
* close any existing result
**************************/
if ( hStmt->hStmtExtras->aResults )
_FreeResults( hStmt->hStmtExtras );
if ( hStmt->pszQuery != NULL )
free( hStmt->pszQuery );
hStmt->pszQuery = NULL;
/************************
* generate a result set listing columns (these will be our rows)
************************/
pResults = msqlListFields( ((HDRVDBC)hStmt->hDbc)->hDbcExtras->hServer, szTableName );
if ( pResults == NULL )
{
sprintf( hStmt->szSqlMsg, "SQL_ERROR Query failed. %s", msqlErrMsg );
logPushMsg( hStmt->hLog, __FILE__, __FILE__, __LINE__, LOG_WARNING, LOG_WARNING, hStmt->szSqlMsg );
return SQL_ERROR;
}
/************************
* how many columns are indexs?
************************/
nIndexColumns = 0;
while ( pField = msqlFetchField( pResults ) )
{
if ( pField->type == IDX_TYPE)
nIndexColumns++;
}
msqlFieldSeek( pResults, 0 );
/**************************
* allocate memory for columns headers and result data (row 0 is column header while col 0 is reserved for bookmarks)
**************************/
hStmt->hStmtExtras->nCols = COL_MAX-1;
hStmt->hStmtExtras->nRows = msqlNumFields( pResults ) - nIndexColumns;
hStmt->hStmtExtras->nRow = 0;
hStmt->hStmtExtras->aResults = malloc( sizeof(char*) * (hStmt->hStmtExtras->nRows+1) * (hStmt->hStmtExtras->nCols+1) );
memset( hStmt->hStmtExtras->aResults, 0, sizeof(char*) * (hStmt->hStmtExtras->nRows+1) * (hStmt->hStmtExtras->nCols+1) );
if ( hStmt->hStmtExtras->aResults == NULL )
{
logPushMsg( hStmt->hLog, __FILE__, __FILE__, __LINE__, LOG_WARNING, LOG_WARNING, "Not enough memory. (malloc failed)" );
hStmt->hStmtExtras->nRows = 0;
hStmt->hStmtExtras->nCols = 0;
msqlFreeResult( pResults );
return SQL_ERROR;
}
/**************************
* gather column header information (save col 0 for bookmarks)
**************************/
for ( nColumn = 1; nColumn < COL_MAX; nColumn++ )
{
(hStmt->hStmtExtras->aResults)[nColumn] = malloc( sizeof(COLUMNHDR) );
pColumnHeader = (COLUMNHDR*)(hStmt->hStmtExtras->aResults)[nColumn];
memset( pColumnHeader, 0, sizeof(COLUMNHDR) );
_NativeToSQLColumnHeader( pColumnHeader, &(aSQLColumns[nColumn]) );
}
/************************
* gather data (save col 0 for bookmarks and factor out index columns)
************************/
nCols = hStmt->hStmtExtras->nCols;
hStmt->hStmtExtras->nRow = 0;
for ( nCurRow = 1; nCurRow <= msqlNumFields( pResults ); nCurRow++ )
{
pField = msqlFetchField( pResults );
if ( pField->type != IDX_TYPE)
{
hStmt->hStmtExtras->nRow++;
nRow = hStmt->hStmtExtras->nRow;
for ( nColumn = 1; nColumn < COL_MAX; nColumn++ )
{
switch ( nColumn )
{
case TABLE_NAME:
(hStmt->hStmtExtras->aResults)[nRow*nCols+nColumn] = (char*)strdup( szTableName );
break;
case COLUMN_NAME:
(hStmt->hStmtExtras->aResults)[nRow*nCols+nColumn] = (char*)strdup( pField->name );
break;
case TYPE_NAME:
(hStmt->hStmtExtras->aResults)[nRow*nCols+nColumn] = (char*)strdup( msqlTypeNames[pField->type] );
break;
case COLUMN_SIZE:
sprintf( szBuffer, "%d", pField->length );
(hStmt->hStmtExtras->aResults)[nRow*nCols+nColumn] = (char*)strdup( szBuffer );
break;
case NULLABLE:
(hStmt->hStmtExtras->aResults)[nRow*nCols+nColumn] = (char *)strdup( IS_NOT_NULL( pField->flags ) ? "0" : "1" );
break;
default:
(hStmt->hStmtExtras->aResults)[nRow*nCols+nColumn] = NULL;
} /* switch nColumn */
} /* for nColumn */
} /* if */
} /* for nRow */
hStmt->hStmtExtras->nRow = 0;
/**************************
* free the snapshot
**************************/
msqlFreeResult( pResults );
logPushMsg( hStmt->hLog, __FILE__, __FILE__, __LINE__, LOG_INFO, LOG_INFO, "SQL_SUCCESS" );
return SQL_SUCCESS;
}
|
