ODBC_SQLColAttribute

4D v16


ODBC_SQLColAttribute ( stmtID ; colNb ; fieldIdentifier ; characterAttrPtr ) -> Resultado

Parámetro	Tipo	Descripción
stmtID	Entero largo	Statement ID
colNb	Entero largo	Number of the record from which the field value is to be retrieved
fieldIdentifier	Entero largo	Field identifier in row colNb that is to be returned
characterAttrPtr	Puntero	Value in the fieldID field of the colNb row if the field is a character string. Otherwise, the field is unused
Resultado	Entero largo	Returns the result of the MS ODBC API function SQLColAttribute

Descripción

The ODBC_SQLColAttribute command returns descriptor information for a column in a result set.

stmtID is a valid statement ID returned by ODBC_SQLAllocStmt.

colNb is the number of the column from which the field value is to be retrieved.

fieldIdentifier defines which field in row colNb to be returned, which can be one of the following values:

Constant	Description
SQL_DESC_AUTO_UNIQUE_VALUE	SQL_TRUE if the column is an autoincrementing column. SQL_FALSE if the column is not an auto-incrementing column or is not numeric.
SQL_DESC_BASE_COLUMN_NAME	The base column name for the result set column.
SQL_DESC_BASE_TABLE_NAME	Name of the base table that contains the column.
SQL_DESC_CASE_SENSITIVE	SQL_TRUE if the column is treated as case-sensitive for collations and comparisons. SQL_FALSE if the column is not treated as case-sensitive for collations and comparisons or is noncharacter
SQL_DESC_CATALOG_NAME	Catalog of the table that contains the column.
SQL_DESC_CONCISE_TYPE	Concise data type.
SQL_DESC_COUNT	Number of columns available in the result set.
SQL_DESC_DISPLAY_SIZE	Maximum number of characters required to display data from the column.
SQL_DESC_DISPLAY_SIZE	Maximum number of characters required to display data from the column.
SQL_DESC_FIXED_PREC_SCALE	SQL_TRUE if the column has a fixed precision and nonzero scale that are data source–specific. SQL_FALSE if the column does not have a fixed precision and nonzero scale that are data source-specific.
SQL_DESC_LABEL	Column label or title.
SQL_DESC_LENGTH	A numeric value that is either the maximum or actual character length of a character string or binary data type.
SQL_DESC_LITERAL_PREFIX	Character or characters that the driver recognizes as a prefix for a literal of this data type.
SQL_DESC_LITERAL_SUFFIX	Character or characters that the driver recognizes as a suffix for a literal of this data type.
SQL_DESC_LOCAL_TYPE_NAME	Any localized (native language) name for the data type that may be different from the regular name of the data type.
SQL_DESC_NAME	Column alias, if it applies.
SQL_DESC_NULLABLE	SQL_ NULLABLE if the column can have NULL values; SQL_NO_NULLS if the column does not have NULL values; or SQL_NULLABLE_UNKNOWN if it is not known whether the column accepts NULL values.
SQL_DESC_NUM_PREX_RADIX	Returns 2 if the field is anapproximate numeric data type. If the data type is an exact numeric type, it returns 10 because the SQL_DESC_PRECISION field contains the number of decimal digits. This field is set to 0 for all non-numeric data types.
SQL_DESC_OCTET_LENGTH	Length, in bytes, of a character string or binary data type.
SQL_DESC_PRECISION	A numeric value that for a numeric data type denotes the applicable precision.
SQL_DESC_SCALE	A numeric value that is the applicable scale for a numeric data type.
SQL_DESC_SCHEMA_NAME	The schema of the table that contains the column.
SQL_DESC_SEARCHABLE	SQL_PRED_NONE if the column cannot be used in a WHERE clause. SQL_PRED_CHAR if the column can be used in a WHERE clause but only with the LIKE predicate. SQL_PRED_BASIC if the column can be used in a WHERE clause with all the comparison operators except LIKE. SQL_PRED_SEARCHABLE if the column can be used in a WHERE clause with any comparison operator.
SQL_DESC_TABLE_NAME	Name of the table that contains the column.
SQL_DESC_TYPE	Numeric value that specifies the SQL data type.
SQL_DESC_TYPE_NAME	Data source–dependent data type name, for example, "CHAR".
SQL_DESC_UNNAMED	If it contains a column alias or a column name, SQL_NAMED is returned. If there is no column name or column alias, SQL_UNNAMED is returned.
SQL_DESC_UNSIGNED	SQL_TRUE if the column is unsigned (or not numeric). SQL_FALSE if the column is signed.
SQL_DESC_UPDATABLE	Updatability of the column

characterAttrPtr is a pointer to the value returned based on fieldIdentifier.

For more information, please see the SQLColAttribute function in the MS ODBC API Reference at http://msdn.microsoft.com/en-us/library/ms713558(VS.85).aspx.

Function Results

SQL_SUCCESS, SQL_SUCCESS_WITH_INFO, SQL_STILL_EXECUTING, SQL_ERROR, or SQL_INVALID_HANDLE.

Ejemplo

The following method returns the name of the second column in the Employee table:

 $result:=ODBC_SQLPrepare($statementID;"SELECT * FROM Employee")

 $result:=ODBC_SQLColAttribute($statementID;2;SQL_DESC_LABEL;->vColumnName)

Ver también

ODBC_SQLPrepare