ResultSetMetaData (Java Platform SE 8 )

All Superinterfaces:

Wrapper

All Known Subinterfaces:

RowSetMetaData

All Known Implementing Classes:

RowSetMetaDataImpl
```
public interface ResultSetMetaData
extends Wrapper
```
An object that can be used to get information about the types and properties of the columns in a 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);

 
```

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`columnNoNulls` The constant indicating that a column does not allow `NULL` values.
`static int`	`columnNullable` The constant indicating that a column allows `NULL` values.
`static int`	`columnNullableUnknown` The constant indicating that the nullability of a column's values is unknown.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and 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.
`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 inherited from interface java.sql.Wrapper
isWrapperFor, unwrap

- Field Detail
  - columnNoNulls
```
static final int columnNoNulls
```
    The constant indicating that a column does not allow NULL values.
    
    See Also:
    
    Constant Field Values
  - columnNullable
```
static final int columnNullable
```
    The constant indicating that a column allows NULL values.
    
    See Also:
    
    Constant Field Values
  - columnNullableUnknown
```
static final int columnNullableUnknown
```
    The constant indicating that the nullability of a column's values is unknown.
    
    See Also:
    
    Constant Field Values
- Method Detail
  - getColumnCount
```
int getColumnCount()
            throws SQLException
```
    Returns the number of columns in this ResultSet object.
    
    Returns:
    
    the number of columns
    
    Throws:
    
    SQLException - if a database access error occurs
  - isAutoIncrement
```
boolean isAutoIncrement(int column)
                 throws SQLException
```
    Indicates whether the designated column is automatically numbered.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    true if so; false otherwise
    
    Throws:
    
    SQLException - if a database access error occurs
  - isCaseSensitive
```
boolean isCaseSensitive(int column)
                 throws SQLException
```
    Indicates whether a column's case matters.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    true if so; false otherwise
    
    Throws:
    
    SQLException - if a database access error occurs
  - isSearchable
```
boolean isSearchable(int column)
              throws SQLException
```
    Indicates whether the designated column can be used in a where clause.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    true if so; false otherwise
    
    Throws:
    
    SQLException - if a database access error occurs
  - isCurrency
```
boolean isCurrency(int column)
            throws SQLException
```
    Indicates whether the designated column is a cash value.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    true if so; false otherwise
    
    Throws:
    
    SQLException - if a database access error occurs
  - isNullable
```
int isNullable(int column)
        throws SQLException
```
    Indicates the nullability of values in the designated column.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    the nullability status of the given column; one of columnNoNulls, columnNullable or columnNullableUnknown
    
    Throws:
    
    SQLException - if a database access error occurs
  - isSigned
```
boolean isSigned(int column)
          throws SQLException
```
    Indicates whether values in the designated column are signed numbers.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    true if so; false otherwise
    
    Throws:
    
    SQLException - if a database access error occurs
  - getColumnDisplaySize
```
int getColumnDisplaySize(int column)
                  throws SQLException
```
    Indicates the designated column's normal maximum width in characters.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    the normal maximum number of characters allowed as the width of the designated column
    
    Throws:
    
    SQLException - if a database access error occurs
  - getColumnLabel
```
String getColumnLabel(int column)
               throws SQLException
```
    Gets the designated column's suggested title for use in printouts and displays. The suggested title is usually specified by the SQL 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.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    the suggested column title
    
    Throws:
    
    SQLException - if a database access error occurs
  - getColumnName
```
String getColumnName(int column)
              throws SQLException
```
    Get the designated column's name.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    column name
    
    Throws:
    
    SQLException - if a database access error occurs
  - getSchemaName
```
String getSchemaName(int column)
              throws SQLException
```
    Get the designated column's table's schema.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    schema name or "" if not applicable
    
    Throws:
    
    SQLException - if a database access error occurs
  - getPrecision
```
int getPrecision(int column)
          throws SQLException
```
    Get the designated column's specified column size. For numeric data, this is the maximum precision. For character data, this is the length in characters. For datetime datatypes, this is the length in characters of the String representation (assuming the maximum allowed precision of the fractional seconds component). For binary data, this is the length in bytes. For the ROWID datatype, this is the length in bytes. 0 is returned for data types where the column size is not applicable.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    precision
    
    Throws:
    
    SQLException - if a database access error occurs
  - getScale
```
int getScale(int column)
      throws SQLException
```
    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.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    scale
    
    Throws:
    
    SQLException - if a database access error occurs
  - getTableName
```
String getTableName(int column)
             throws SQLException
```
    Gets the designated column's table name.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    table name or "" if not applicable
    
    Throws:
    
    SQLException - if a database access error occurs
  - getCatalogName
```
String getCatalogName(int column)
               throws SQLException
```
    Gets the designated column's table's catalog name.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    the name of the catalog for the table in which the given column appears or "" if not applicable
    
    Throws:
    
    SQLException - if a database access error occurs
  - getColumnType
```
int getColumnType(int column)
           throws SQLException
```
    Retrieves the designated column's SQL type.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    SQL type from java.sql.Types
    
    Throws:
    
    SQLException - if a database access error occurs
    
    See Also:
    
    Types
  - getColumnTypeName
```
String getColumnTypeName(int column)
                  throws SQLException
```
    Retrieves the designated column's database-specific type name.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    type name used by the database. If the column type is a user-defined type, then a fully-qualified type name is returned.
    
    Throws:
    
    SQLException - if a database access error occurs
  - isReadOnly
```
boolean isReadOnly(int column)
            throws SQLException
```
    Indicates whether the designated column is definitely not writable.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    true if so; false otherwise
    
    Throws:
    
    SQLException - if a database access error occurs
  - isWritable
```
boolean isWritable(int column)
            throws SQLException
```
    Indicates whether it is possible for a write on the designated column to succeed.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    true if so; false otherwise
    
    Throws:
    
    SQLException - if a database access error occurs
  - isDefinitelyWritable
```
boolean isDefinitelyWritable(int column)
                      throws SQLException
```
    Indicates whether a write on the designated column will definitely succeed.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    true if so; false otherwise
    
    Throws:
    
    SQLException - if a database access error occurs
  - getColumnClassName
```
String 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.
    
    Parameters:
    
    column - the first column is 1, the second is 2, ...
    
    Returns:
    
    the fully-qualified name of the class in the Java programming language that would be used by the method ResultSet.getObject to retrieve the value in the specified column. This is the class name used for custom mapping.
    
    Throws:
    
    SQLException - if a database access error occurs
    
    Since:
    
    1.2

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Interface ResultSetMetaData

Field Summary

Method Summary

Methods inherited from interface java.sql.Wrapper

Field Detail

columnNoNulls

columnNullable

columnNullableUnknown

Method Detail

getColumnCount

isAutoIncrement

isCaseSensitive

isSearchable

isCurrency

isNullable

isSigned

getColumnDisplaySize

getColumnLabel

getColumnName

getSchemaName

getPrecision

getScale

getTableName

getCatalogName

getColumnType

getColumnTypeName

isReadOnly

isWritable

isDefinitelyWritable

getColumnClassName