# Interface RowSetMetaData

All Superinterfaces:
  `ResultSetMetaData, Wrapper`

All Known Implementing Classes:
  `RowSetMetaDataImpl`

public interface RowSetMetaData extends ResultSetMetaData
An object that contains information about the columns in a `RowSet` object. This interface is an extension of the `ResultSetMetaData` interface with methods for setting the values in a `RowSetMetaData` object. When a `RowSetReader` object reads data into a `RowSet` object, it creates a `RowSetMetaData` object and initializes it using the methods in the `RowSetMetaData` interface. Then the reader passes the `RowSetMetaData` object to the rowset.

The methods in this interface are invoked internally when an application calls the method `RowSet.execute`; an application programmer would not use them directly.

Since:
  1.4

- ## Field Summary

  ### Fields declared in interface ResultSetMetaData

  `columnNoNulls, columnNullable, columnNullableUnknown`
  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.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `setAutoIncrement(int columnIndex, boolean property)`
  Sets whether the designated column is automatically numbered, The default is for a `RowSet` object's columns not to be automatically numbered.
  `void`
  `setCaseSensitive(int columnIndex, boolean property)`
  Sets whether the designated column is case sensitive.
  `void`
  `setCatalogName(int columnIndex, String catalogName)`
  Sets the designated column's table's catalog name, if any, to the given `String`.
  `void`
  `setColumnCount(int columnCount)`
  Sets the number of columns in the `RowSet` object to the given number.
  `void`
  `setColumnDisplaySize(int columnIndex, int size)`
  Sets the designated column's normal maximum width in chars to the given `int`.
  `void`
  `setColumnLabel(int columnIndex, String label)`
  Sets the suggested column title for use in printouts and displays, if any, to the given `String`.
  `void`
  `setColumnName(int columnIndex, String columnName)`
  Sets the name of the designated column to the given `String`.
  `void`
  `setColumnType(int columnIndex, int SQLType)`
  Sets the designated column's SQL type to the one given.
  `void`
  `setColumnTypeName(int columnIndex, String typeName)`
  Sets the designated column's type name that is specific to the data source, if any, to the given `String`.
  `void`
  `setCurrency(int columnIndex, boolean property)`
  Sets whether the designated column is a cash value.
  `void`
  `setNullable(int columnIndex, int property)`
  Sets whether the designated column's value can be set to `NULL`.
  `void`
  `setPrecision(int columnIndex, int precision)`
  Sets the designated column's number of decimal digits to the given `int`.
  `void`
  `setScale(int columnIndex, int scale)`
  Sets the designated column's number of digits to the right of the decimal point to the given `int`.
  `void`
  `setSchemaName(int columnIndex, String schemaName)`
  Sets the name of the designated column's table's schema, if any, to the given `String`.
  `void`
  `setSearchable(int columnIndex, boolean property)`
  Sets whether the designated column can be used in a where clause.
  `void`
  `setSigned(int columnIndex, boolean property)`
  Sets whether the designated column is a signed number.
  `void`
  `setTableName(int columnIndex, String tableName)`
  Sets the designated column's table name, if any, to the given `String`.

  ### Methods declared in interface ResultSetMetaData

  `getCatalogName, getColumnClassName, getColumnCount, getColumnDisplaySize, getColumnLabel, getColumnName, getColumnType, getColumnTypeName, getPrecision, getScale, getSchemaName, getTableName, isAutoIncrement, isCaseSensitive, isCurrency, isDefinitelyWritable, isNullable, isReadOnly, isSearchable, isSigned, isWritable`
  Modifier and Type
  Method
  Description
  `String`
  `getCatalogName(int column)`
  Gets the designated column's table's catalog name.
  `String`
  `getColumnClassName(int column)`
  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(int column)`
  Indicates the designated column's normal maximum width in characters.
  `String`
  `getColumnLabel(int column)`
  Gets the designated column's suggested title for use in printouts and displays.
  `String`
  `getColumnName(int column)`
  Get the designated column's name.
  `int`
  `getColumnType(int column)`
  Retrieves the designated column's SQL type.
  `String`
  `getColumnTypeName(int column)`
  Retrieves the designated column's database-specific type name.
  `int`
  `getPrecision(int column)`
  Get the designated column's specified column size.
  `int`
  `getScale(int column)`
  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(int column)`
  Get the designated column's table's schema.
  `String`
  `getTableName(int column)`
  Gets the designated column's table name.
  `boolean`
  `isAutoIncrement(int column)`
  Indicates whether the designated column is automatically numbered.
  `boolean`
  `isCaseSensitive(int column)`
  Indicates whether a column's case matters.
  `boolean`
  `isCurrency(int column)`
  Indicates whether the designated column is a cash value.
  `boolean`
  `isDefinitelyWritable(int column)`
  Indicates whether a write on the designated column will definitely succeed.
  `int`
  `isNullable(int column)`
  Indicates the nullability of values in the designated column.
  `boolean`
  `isReadOnly(int column)`
  Indicates whether the designated column is definitely not writable.
  `boolean`
  `isSearchable(int column)`
  Indicates whether the designated column can be used in a where clause.
  `boolean`
  `isSigned(int column)`
  Indicates whether values in the designated column are signed numbers.
  `boolean`
  `isWritable(int column)`
  Indicates whether it is possible for a write on the designated column to succeed.

  ### Methods declared in interface Wrapper

  `isWrapperFor, unwrap`
  Modifier and Type
  Method
  Description
  `boolean`
  `isWrapperFor(Class<?> iface)`
  Returns true if this either implements the interface argument or is directly or indirectly a wrapper for an object that does.
  `<T> T`
  `unwrap(Class<T> iface)`
  Returns an object that implements the given interface to allow access to non-standard methods, or standard methods not exposed by the proxy.

- ## Method Details

  - ### setColumnCount

    void setColumnCount(int columnCount) throws SQLException
    Sets the number of columns in the `RowSet` object to the given number.
    Parameters:
      `columnCount` - the number of columns in the `RowSet` object
    Throws:
      `SQLException` - if a database access error occurs

  - ### setAutoIncrement

    void setAutoIncrement(int columnIndex, boolean property) throws SQLException
    Sets whether the designated column is automatically numbered, The default is for a `RowSet` object's columns not to be automatically numbered.
    Parameters:
      `columnIndex` - the first column is 1, the second is 2, ...
      `property` - `true` if the column is automatically numbered; `false` if it is not
    Throws:
      `SQLException` - if a database access error occurs

  - ### setCaseSensitive

    void setCaseSensitive(int columnIndex, boolean property) throws SQLException
    Sets whether the designated column is case sensitive. The default is `false`.
    Parameters:
      `columnIndex` - the first column is 1, the second is 2, ...
      `property` - `true` if the column is case sensitive; `false` if it is not
    Throws:
      `SQLException` - if a database access error occurs

  - ### setSearchable

    void setSearchable(int columnIndex, boolean property) throws SQLException
    Sets whether the designated column can be used in a where clause. The default is `false`.
    Parameters:
      `columnIndex` - the first column is 1, the second is 2, ...
      `property` - `true` if the column can be used in a `WHERE` clause; `false` if it cannot
    Throws:
      `SQLException` - if a database access error occurs

  - ### setCurrency

    void setCurrency(int columnIndex, boolean property) throws SQLException
    Sets whether the designated column is a cash value. The default is `false`.
    Parameters:
      `columnIndex` - the first column is 1, the second is 2, ...
      `property` - `true` if the column is a cash value; `false` if it is not
    Throws:
      `SQLException` - if a database access error occurs

  - ### setNullable

    void setNullable(int columnIndex, int property) throws SQLException
    Sets whether the designated column's value can be set to `NULL`. The default is `ResultSetMetaData.columnNullableUnknown`
    Parameters:
      `columnIndex` - the first column is 1, the second is 2, ...
      `property` - one of the following constants: `ResultSetMetaData.columnNoNulls`, `ResultSetMetaData.columnNullable`, or `ResultSetMetaData.columnNullableUnknown`
    Throws:
      `SQLException` - if a database access error occurs

  - ### setSigned

    void setSigned(int columnIndex, boolean property) throws SQLException
    Sets whether the designated column is a signed number. The default is `false`.
    Parameters:
      `columnIndex` - the first column is 1, the second is 2, ...
      `property` - `true` if the column is a signed number; `false` if it is not
    Throws:
      `SQLException` - if a database access error occurs

  - ### setColumnDisplaySize

    void setColumnDisplaySize(int columnIndex, int size) throws SQLException
    Sets the designated column's normal maximum width in chars to the given `int`.
    Parameters:
      `columnIndex` - the first column is 1, the second is 2, ...
      `size` - the normal maximum number of characters for the designated column
    Throws:
      `SQLException` - if a database access error occurs

  - ### setColumnLabel

    void setColumnLabel(int columnIndex, String label) throws SQLException
    Sets the suggested column title for use in printouts and displays, if any, to the given `String`.
    Parameters:
      `columnIndex` - the first column is 1, the second is 2, ...
      `label` - the column title
    Throws:
      `SQLException` - if a database access error occurs

  - ### setColumnName

    void setColumnName(int columnIndex, String columnName) throws SQLException
    Sets the name of the designated column to the given `String`.
    Parameters:
      `columnIndex` - the first column is 1, the second is 2, ...
      `columnName` - the designated column's name
    Throws:
      `SQLException` - if a database access error occurs

  - ### setSchemaName

    void setSchemaName(int columnIndex, String schemaName) throws SQLException
    Sets the name of the designated column's table's schema, if any, to the given `String`.
    Parameters:
      `columnIndex` - the first column is 1, the second is 2, ...
      `schemaName` - the schema name
    Throws:
      `SQLException` - if a database access error occurs

  - ### setPrecision

    void setPrecision(int columnIndex, int precision) throws SQLException
    Sets the designated column's number of decimal digits to the given `int`.
    Parameters:
      `columnIndex` - the first column is 1, the second is 2, ...
      `precision` - the total number of decimal digits
    Throws:
      `SQLException` - if a database access error occurs

  - ### setScale

    void setScale(int columnIndex, int scale) throws SQLException
    Sets the designated column's number of digits to the right of the decimal point to the given `int`.
    Parameters:
      `columnIndex` - the first column is 1, the second is 2, ...
      `scale` - the number of digits to right of decimal point
    Throws:
      `SQLException` - if a database access error occurs

  - ### setTableName

    void setTableName(int columnIndex, String tableName) throws SQLException
    Sets the designated column's table name, if any, to the given `String`.
    Parameters:
      `columnIndex` - the first column is 1, the second is 2, ...
      `tableName` - the column's table name
    Throws:
      `SQLException` - if a database access error occurs

  - ### setCatalogName

    void setCatalogName(int columnIndex, String catalogName) throws SQLException
    Sets the designated column's table's catalog name, if any, to the given `String`.
    Parameters:
      `columnIndex` - the first column is 1, the second is 2, ...
      `catalogName` - the column's catalog name
    Throws:
      `SQLException` - if a database access error occurs

  - ### setColumnType

    void setColumnType(int columnIndex, int SQLType) throws SQLException
    Sets the designated column's SQL type to the one given.
    Parameters:
      `columnIndex` - the first column is 1, the second is 2, ...
      `SQLType` - the column's SQL type
    Throws:
      `SQLException` - if a database access error occurs
    See Also:
      - `Types`

  - ### setColumnTypeName

    void setColumnTypeName(int columnIndex, String typeName) throws SQLException
    Sets the designated column's type name that is specific to the data source, if any, to the given `String`.
    Parameters:
      `columnIndex` - the first column is 1, the second is 2, ...
      `typeName` - data source specific type name.
    Throws:
      `SQLException` - if a database access error occurs