Wrapper
RowSetMetaData
RowSetMetaDataImpl
public interface ResultSetMetaData extends Wrapper
ResultSet
object. The following code fragment creates the ResultSet
object rs, creates the ResultSetMetaData
object rsmd, and uses rsmd to find out how many columns rs has and whether the first column in rs can be used in a WHERE
clause. ResultSet rs = stmt.executeQuery("SELECT a, b, c FROM TABLE2"); ResultSetMetaData rsmd = rs.getMetaData(); int numberOfColumns = rsmd.getColumnCount(); boolean b = rsmd.isSearchable(1);
Modifier and Type | Field | Description |
---|---|---|
static final int |
columnNoNulls |
The constant indicating that a column does not allow NULL values. |
static final int |
columnNullable |
The constant indicating that a column allows NULL values. |
static final int |
columnNullableUnknown |
The constant indicating that the nullability of a column's values is unknown. |
Modifier and Type | Method | Description |
---|---|---|
String |
getCatalogName |
Gets the designated column's table's catalog name. |
String |
getColumnClassName |
Returns the fully-qualified name of the Java class whose instances are manufactured if the method ResultSet.getObject is called to retrieve a value from the column. |
int |
getColumnCount() |
Returns the number of columns in this ResultSet object. |
int |
getColumnDisplaySize |
Indicates the designated column's normal maximum width in characters. |
String |
getColumnLabel |
Gets the designated column's suggested title for use in printouts and displays. |
String |
getColumnName |
Get the designated column's name. |
int |
getColumnType |
Retrieves the designated column's SQL type. |
String |
getColumnTypeName |
Retrieves the designated column's database-specific type name. |
int |
getPrecision |
Get the designated column's specified column size. |
int |
getScale |
Gets the designated column's number of digits to right of the decimal point. 0 is returned for data types where the scale is not applicable. |
String |
getSchemaName |
Get the designated column's table's schema. |
String |
getTableName |
Gets the designated column's table name. |
boolean |
isAutoIncrement |
Indicates whether the designated column is automatically numbered. |
boolean |
isCaseSensitive |
Indicates whether a column's case matters. |
boolean |
isCurrency |
Indicates whether the designated column is a cash value. |
boolean |
isDefinitelyWritable |
Indicates whether a write on the designated column will definitely succeed. |
int |
isNullable |
Indicates the nullability of values in the designated column. |
boolean |
isReadOnly |
Indicates whether the designated column is definitely not writable. |
boolean |
isSearchable |
Indicates whether the designated column can be used in a where clause. |
boolean |
isSigned |
Indicates whether values in the designated column are signed numbers. |
boolean |
isWritable |
Indicates whether it is possible for a write on the designated column to succeed. |
isWrapperFor, unwrap
static final int columnNoNulls
NULL
values.static final int columnNullable
NULL
values.static final int columnNullableUnknown
int getColumnCount() throws SQLException
ResultSet
object.SQLException
- if a database access error occursboolean isAutoIncrement(int column) throws SQLException
column
- the first column is 1, the second is 2, ...true
if so; false
otherwiseSQLException
- if a database access error occursboolean isCaseSensitive(int column) throws SQLException
column
- the first column is 1, the second is 2, ...true
if so; false
otherwiseSQLException
- if a database access error occursboolean isSearchable(int column) throws SQLException
column
- the first column is 1, the second is 2, ...true
if so; false
otherwiseSQLException
- if a database access error occursboolean isCurrency(int column) throws SQLException
column
- the first column is 1, the second is 2, ...true
if so; false
otherwiseSQLException
- if a database access error occursint isNullable(int column) throws SQLException
column
- the first column is 1, the second is 2, ...columnNoNulls
, columnNullable
or columnNullableUnknown
SQLException
- if a database access error occursboolean isSigned(int column) throws SQLException
column
- the first column is 1, the second is 2, ...true
if so; false
otherwiseSQLException
- if a database access error occursint getColumnDisplaySize(int column) throws SQLException
column
- the first column is 1, the second is 2, ...SQLException
- if a database access error occursString getColumnLabel(int column) throws SQLException
AS
clause. If a SQL AS
is not specified, the value returned from getColumnLabel
will be the same as the value returned by the getColumnName
method.column
- the first column is 1, the second is 2, ...SQLException
- if a database access error occursString getColumnName(int column) throws SQLException
column
- the first column is 1, the second is 2, ...SQLException
- if a database access error occursString getSchemaName(int column) throws SQLException
column
- the first column is 1, the second is 2, ...SQLException
- if a database access error occursint getPrecision(int column) throws SQLException
column
- the first column is 1, the second is 2, ...SQLException
- if a database access error occursint getScale(int column) throws SQLException
column
- the first column is 1, the second is 2, ...SQLException
- if a database access error occursString getTableName(int column) throws SQLException
column
- the first column is 1, the second is 2, ...SQLException
- if a database access error occursString getCatalogName(int column) throws SQLException
column
- the first column is 1, the second is 2, ...SQLException
- if a database access error occursint getColumnType(int column) throws SQLException
column
- the first column is 1, the second is 2, ...SQLException
- if a database access error occursString getColumnTypeName(int column) throws SQLException
column
- the first column is 1, the second is 2, ...SQLException
- if a database access error occursboolean isReadOnly(int column) throws SQLException
column
- the first column is 1, the second is 2, ...true
if so; false
otherwiseSQLException
- if a database access error occursboolean isWritable(int column) throws SQLException
column
- the first column is 1, the second is 2, ...true
if so; false
otherwiseSQLException
- if a database access error occursboolean isDefinitelyWritable(int column) throws SQLException
column
- the first column is 1, the second is 2, ...true
if so; false
otherwiseSQLException
- if a database access error occursString getColumnClassName(int column) throws SQLException
Returns the fully-qualified name of the Java class whose instances are manufactured if the method ResultSet.getObject
is called to retrieve a value from the column. ResultSet.getObject
may return a subclass of the class returned by this method.
column
- the first column is 1, the second is 2, ...ResultSet.getObject
to retrieve the value in the specified column. This is the class name used for custom mapping.SQLException
- if a database access error occurs
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https://docs.oracle.com/en/java/javase/21/docs/api/java.sql/java/sql/ResultSetMetaData.html