ResultSetMetaData - JRE Emulation | JRE Emulation
public interface

ResultSetMetaData

implements Wrapper
java.sql.ResultSetMetaData

Class Overview

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);

 

Summary

Constants
int columnNoNulls The constant indicating that a column does not allow NULL values.
int columnNullable The constant indicating that a column allows NULL values.
int columnNullableUnknown The constant indicating that the nullability of a column's values is unknown.
Public Methods
abstract String getCatalogName(int column)
Gets the designated column's table's catalog name.
abstract 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.

abstract int getColumnCount()
Returns the number of columns in this ResultSet object.
abstract int getColumnDisplaySize(int column)
Indicates the designated column's normal maximum width in characters.
abstract String getColumnLabel(int column)
Gets the designated column's suggested title for use in printouts and displays.
abstract String getColumnName(int column)
Get the designated column's name.
abstract int getColumnType(int column)
Retrieves the designated column's SQL type.
abstract String getColumnTypeName(int column)
Retrieves the designated column's database-specific type name.
abstract int getPrecision(int column)
Get the designated column's specified column size.
abstract int getScale(int column)
Gets the designated column's number of digits to right of the decimal point.
abstract String getSchemaName(int column)
Get the designated column's table's schema.
abstract String getTableName(int column)
Gets the designated column's table name.
abstract boolean isAutoIncrement(int column)
Indicates whether the designated column is automatically numbered.
abstract boolean isCaseSensitive(int column)
Indicates whether a column's case matters.
abstract boolean isCurrency(int column)
Indicates whether the designated column is a cash value.
abstract boolean isDefinitelyWritable(int column)
Indicates whether a write on the designated column will definitely succeed.
abstract int isNullable(int column)
Indicates the nullability of values in the designated column.
abstract boolean isReadOnly(int column)
Indicates whether the designated column is definitely not writable.
abstract boolean isSearchable(int column)
Indicates whether the designated column can be used in a where clause.
abstract boolean isSigned(int column)
Indicates whether values in the designated column are signed numbers.
abstract boolean isWritable(int column)
Indicates whether it is possible for a write on the designated column to succeed.
Inherited Methods
[Expand]
From interface java.sql.Wrapper

Constants

public static final int columnNoNulls

The constant indicating that a column does not allow NULL values.

Constant Value: 0 (0x00000000)

public static final int columnNullable

The constant indicating that a column allows NULL values.

Constant Value: 1 (0x00000001)

public static final int columnNullableUnknown

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

Constant Value: 2 (0x00000002)

Public Methods

public abstract String getCatalogName (int column)

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

public abstract 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. 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

public abstract int getColumnCount ()

Returns the number of columns in this ResultSet object.

Returns
  • the number of columns
Throws
SQLException if a database access error occurs

public abstract int getColumnDisplaySize (int column)

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

public abstract String getColumnLabel (int column)

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

public abstract String getColumnName (int column)

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

public abstract int getColumnType (int column)

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

public abstract String getColumnTypeName (int column)

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

public abstract int getPrecision (int column)

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

public abstract 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.

Parameters
column the first column is 1, the second is 2, ...
Returns
  • scale
Throws
SQLException if a database access error occurs

public abstract String getSchemaName (int column)

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

public abstract String getTableName (int column)

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

public abstract boolean isAutoIncrement (int column)

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

public abstract boolean isCaseSensitive (int column)

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

public abstract boolean isCurrency (int column)

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

public abstract boolean isDefinitelyWritable (int column)

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

public abstract int isNullable (int column)

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

public abstract boolean isReadOnly (int column)

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

public abstract boolean isSearchable (int column)

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

public abstract boolean isSigned (int column)

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

public abstract boolean isWritable (int column)

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