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Interface ResultSetMetaData

All Superinterfaces:

Wrapper

All Known Subinterfaces:

RowSetMetaData

All Known Implementing Classes:

RowSetMetaDataImpl

public interfaceResultSetMetaData
extendsWrapper

An object that can be used to get information about the types and properties of the columns in aResultSet object. The following code fragment creates theResultSet object rs, creates theResultSetMetaData object rsmd, and uses rsmd to find out how many columns rs has and whether the first column in rs can be used in aWHERE clause.

     ResultSet rs = stmt.executeQuery("SELECT a, b, c FROM TABLE2");     ResultSetMetaData rsmd = rs.getMetaData();     int numberOfColumns = rsmd.getColumnCount();     boolean b = rsmd.isSearchable(1);

columnNoNulls

static final intcolumnNoNulls

The constant indicating that a column does not allowNULL values.

See Also:

Constant Field Values

columnNullable

static final intcolumnNullable

The constant indicating that a column allowsNULL values.

See Also:

Constant Field Values

columnNullableUnknown

static final intcolumnNullableUnknown

The constant indicating that the nullability of a column's values is unknown.

See Also:

Constant Field Values

getColumnCount

intgetColumnCount()                   throwsSQLException

Returns the number of columns in thisResultSet object.

Returns:

the number of columns

Throws:

SQLException - if a database access error occurs

isAutoIncrement

booleanisAutoIncrement(int column)                        throwsSQLException

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

booleanisCaseSensitive(int column)                        throwsSQLException

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

booleanisSearchable(int column)                     throwsSQLException

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

booleanisCurrency(int column)                   throwsSQLException

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

intisNullable(int column)               throwsSQLException

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 ofcolumnNoNulls,columnNullable orcolumnNullableUnknown

Throws:

SQLException - if a database access error occurs

isSigned

booleanisSigned(int column)                 throwsSQLException

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

intgetColumnDisplaySize(int column)                         throwsSQLException

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

StringgetColumnLabel(int column)                      throwsSQLException

Gets the designated column's suggested title for use in printouts and displays. The suggested title is usually specified by the SQLAS clause. If a SQLAS is not specified, the value returned fromgetColumnLabel will be the same as the value returned by thegetColumnName 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

StringgetColumnName(int column)                     throwsSQLException

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

StringgetSchemaName(int column)                     throwsSQLException

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

intgetPrecision(int column)                 throwsSQLException

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

intgetScale(int column)             throwsSQLException

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

StringgetTableName(int column)                    throwsSQLException

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

StringgetCatalogName(int column)                      throwsSQLException

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

intgetColumnType(int column)                  throwsSQLException

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

StringgetColumnTypeName(int column)                         throwsSQLException

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

booleanisReadOnly(int column)                   throwsSQLException

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

booleanisWritable(int column)                   throwsSQLException

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

booleanisDefinitelyWritable(int column)                             throwsSQLException

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

StringgetColumnClassName(int column)                          throwsSQLException

Returns the fully-qualified name of the Java class whose instances are manufactured if the methodResultSet.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 methodResultSet.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