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Interface java.sql.ResultSetMetaData - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Interface java.sql.ResultSetMetaData

public interface ResultSetMetaData
A ResultSetMetaData object can be used to find out about the types and properties of the columns in a ResultSet.


Variable Index

 o columnNoNulls
Does not allow NULL values.
 o columnNullable
Allows NULL values.
 o columnNullableUnknown
Nullability unknown.

Method Index

 o getCatalogName(int)
What's a column's table's catalog name?
 o getColumnCount()
What's the number of columns in the ResultSet?
 o getColumnDisplaySize(int)
What's the column's normal max width in chars?
 o getColumnLabel(int)
What's the suggested column title for use in printouts and displays?
 o getColumnName(int)
What's a column's name?
 o getColumnType(int)
What's a column's SQL type?
 o getColumnTypeName(int)
What's a column's data source specific type name?
 o getPrecision(int)
What's a column's number of decimal digits?
 o getScale(int)
What's a column's number of digits to right of the decimal point?
 o getSchemaName(int)
What's a column's table's schema?
 o getTableName(int)
What's a column's table name?
 o isAutoIncrement(int)
Is the column automatically numbered, thus read-only?
 o isCaseSensitive(int)
Does a column's case matter?
 o isCurrency(int)
Is the column a cash value?
 o isDefinitelyWritable(int)
Will a write on the column definitely succeed?
 o isNullable(int)
Can you put a NULL in this column?
 o isReadOnly(int)
Is a column definitely not writable?
 o isSearchable(int)
Can the column be used in a where clause?
 o isSigned(int)
Is the column a signed number?
 o isWritable(int)
Is it possible for a write on the column to succeed?

Variables

 o columnNoNulls
 public static final int columnNoNulls
Does not allow NULL values.

 o columnNullable
 public static final int columnNullable
Allows NULL values.

 o columnNullableUnknown
 public static final int columnNullableUnknown
Nullability unknown.

Methods

 o getColumnCount
 public abstract int getColumnCount() throws SQLException
What's the number of columns in the ResultSet?

Returns:
the number
Throws: SQLException
if a database-access error occurs.
 o isAutoIncrement
 public abstract boolean isAutoIncrement(int column) throws SQLException
Is the column automatically numbered, thus read-only?

Parameters:
column - the first column is 1, the second is 2, ...
Returns:
true if so
Throws: SQLException
if a database-access error occurs.
 o isCaseSensitive
 public abstract boolean isCaseSensitive(int column) throws SQLException
Does a column's case matter?

Parameters:
column - the first column is 1, the second is 2, ...
Returns:
true if so
Throws: SQLException
if a database-access error occurs.
 o isSearchable
 public abstract boolean isSearchable(int column) throws SQLException
Can the column be used in a where clause?

Parameters:
column - the first column is 1, the second is 2, ...
Returns:
true if so
Throws: SQLException
if a database-access error occurs.
 o isCurrency
 public abstract boolean isCurrency(int column) throws SQLException
Is the column a cash value?

Parameters:
column - the first column is 1, the second is 2, ...
Returns:
true if so
Throws: SQLException
if a database-access error occurs.
 o isNullable
 public abstract int isNullable(int column) throws SQLException
Can you put a NULL in this column?

Parameters:
column - the first column is 1, the second is 2, ...
Returns:
columnNoNulls, columnNullable or columnNullableUnknown
Throws: SQLException
if a database-access error occurs.
 o isSigned
 public abstract boolean isSigned(int column) throws SQLException
Is the column a signed number?

Parameters:
column - the first column is 1, the second is 2, ...
Returns:
true if so
Throws: SQLException
if a database-access error occurs.
 o getColumnDisplaySize
 public abstract int getColumnDisplaySize(int column) throws SQLException
What's the column's normal max width in chars?

Parameters:
column - the first column is 1, the second is 2, ...
Returns:
max width
Throws: SQLException
if a database-access error occurs.
 o getColumnLabel
 public abstract String getColumnLabel(int column) throws SQLException
What's the suggested column title for use in printouts and displays?

Parameters:
column - the first column is 1, the second is 2, ...
Returns:
true if so
Throws: SQLException
if a database-access error occurs.
 o getColumnName
 public abstract String getColumnName(int column) throws SQLException
What's a 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.
 o getSchemaName
 public abstract String getSchemaName(int column) throws SQLException
What's a 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.
 o getPrecision
 public abstract int getPrecision(int column) throws SQLException
What's a column's number of decimal digits?

Parameters:
column - the first column is 1, the second is 2, ...
Returns:
precision
Throws: SQLException
if a database-access error occurs.
 o getScale
 public abstract int getScale(int column) throws SQLException
What's a column's number of digits to right of the decimal point?

Parameters:
column - the first column is 1, the second is 2, ...
Returns:
scale
Throws: SQLException
if a database-access error occurs.
 o getTableName
 public abstract String getTableName(int column) throws SQLException
What's a column's table name?

Returns:
table name or "" if not applicable
Throws: SQLException
if a database-access error occurs.
 o getCatalogName
 public abstract String getCatalogName(int column) throws SQLException
What's a column's table's catalog name?

Parameters:
column - the first column is 1, the second is 2, ...
Returns:
column name or "" if not applicable.
Throws: SQLException
if a database-access error occurs.
 o getColumnType
 public abstract int getColumnType(int column) throws SQLException
What's a column's SQL type?

Parameters:
column - the first column is 1, the second is 2, ...
Returns:
SQL type
Throws: SQLException
if a database-access error occurs.
See Also:
Types
 o getColumnTypeName
 public abstract String getColumnTypeName(int column) throws SQLException
What's a column's data source specific type name?

Parameters:
column - the first column is 1, the second is 2, ...
Returns:
type name
Throws: SQLException
if a database-access error occurs.
 o isReadOnly
 public abstract boolean isReadOnly(int column) throws SQLException
Is a column definitely not writable?

Parameters:
column - the first column is 1, the second is 2, ...
Returns:
true if so
Throws: SQLException
if a database-access error occurs.
 o isWritable
 public abstract boolean isWritable(int column) throws SQLException
Is it possible for a write on the column to succeed?

Parameters:
column - the first column is 1, the second is 2, ...
Returns:
true if so
Throws: SQLException
if a database-access error occurs.
 o isDefinitelyWritable
 public abstract boolean isDefinitelyWritable(int column) throws SQLException
Will a write on the column definitely succeed?

Parameters:
column - the first column is 1, the second is 2, ...
Returns:
true if so
Throws: SQLException
if a database-access error occurs.

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