8.6.11 getBestRowIdentifier(String catalog, String schema, String table, int scope, boolean nullable)
- Organization of this subsection
(1) Function
This method acquires information about the optimum column set for a table in which rows are identified uniquely.
(2) Format
public synchronized ResultSet getBestRowIdentifier(String catalog, String schema, String table, int scope, boolean nullable) throws SQLException
(3) Arguments
- String catalog
-
Specifies a catalog name. This argument is ignored, if specified.
- String schema
-
Specifies a schema name. This argument is ignored, if specified.
- String table
-
Specifies a table name. This argument is ignored, if specified.
- int scope
-
Specifies a target scale. This argument is ignored, if specified.
- boolean nullable
-
Specifies whether a column in which the null value can be specified is included. This argument is ignored, if specified.
(4) Return value
This method always returns a ResultSet object that contains no retrieval result rows. The following table shows the format of the ResultSet object that is returned.
|
Column No. |
Type |
Column name |
Description |
|---|---|---|---|
|
1 |
short |
SCOPE |
Actual scale of the result |
|
2 |
String |
COLUMN_NAME |
Column name |
|
3 |
int |
DATA_TYPE |
SQL type |
|
4 |
String |
TYPE_NAME |
Type name |
|
5 |
int |
COLUMN_SIZE |
Precision |
|
6 |
int |
BUFFER_LENGTH |
Not used |
|
7 |
short |
DECIMAL_DIGITS |
Decimal places |
|
8 |
short |
PSEUDO_COLUMN |
Whether this is a pseudo column |
(5) Exceptions
If this Connection object is closed before this method is executed, the JDBC driver throws an SQLException.