ParameterMetaData

public interface ParameterMetaData implements Wrapper

An object that can be used to get information about the types and properties for each parameter marker in a PreparedStatement object. For some queries and driver implementations, the data that would be returned by a ParameterMetaData object may not be available until the PreparedStatement has been executed.

Some driver implementations may not be able to provide information about the types and properties for each parameter marker in a CallableStatement object.

Constant Summary

int parameterModeIn The constant indicating that the parameter's mode is IN.
int parameterModeInOut The constant indicating that the parameter's mode is INOUT.
int parameterModeOut The constant indicating that the parameter's mode is OUT.
int parameterModeUnknown The constant indicating that the mode of the parameter is unknown.
int parameterNoNulls The constant indicating that a parameter will not allow NULL values.
int parameterNullable The constant indicating that a parameter will allow NULL values.
int parameterNullableUnknown The constant indicating that the nullability of a parameter is unknown.

Public Method Summary

abstract String
getParameterClassName(int param)
Retrieves the fully-qualified name of the Java class whose instances should be passed to the method PreparedStatement.setObject.
abstract int
getParameterCount()
Retrieves the number of parameters in the PreparedStatement object for which this ParameterMetaData object contains information.
abstract int
getParameterMode(int param)
Retrieves the designated parameter's mode.
abstract int
getParameterType(int param)
Retrieves the designated parameter's SQL type.
abstract String
getParameterTypeName(int param)
Retrieves the designated parameter's database-specific type name.
abstract int
getPrecision(int param)
Retrieves the designated parameter's specified column size.
abstract int
getScale(int param)
Retrieves the designated parameter's number of digits to right of the decimal point.
abstract int
isNullable(int param)
Retrieves whether null values are allowed in the designated parameter.
abstract boolean
isSigned(int param)
Retrieves whether values for the designated parameter can be signed numbers.

Inherited Method Summary

Constants

public static final int parameterModeIn

The constant indicating that the parameter's mode is IN.

Constant Value: 1

public static final int parameterModeInOut

The constant indicating that the parameter's mode is INOUT.

Constant Value: 2

public static final int parameterModeOut

The constant indicating that the parameter's mode is OUT.

Constant Value: 4

public static final int parameterModeUnknown

The constant indicating that the mode of the parameter is unknown.

Constant Value: 0

public static final int parameterNoNulls

The constant indicating that a parameter will not allow NULL values.

Constant Value: 0

public static final int parameterNullable

The constant indicating that a parameter will allow NULL values.

Constant Value: 1

public static final int parameterNullableUnknown

The constant indicating that the nullability of a parameter is unknown.

Constant Value: 2

Public Methods

public abstract String getParameterClassName (int param)

Retrieves the fully-qualified name of the Java class whose instances should be passed to the method PreparedStatement.setObject.

Parameters
param the first parameter 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 PreparedStatement.setObject to set the value in the specified parameter. This is the class name used for custom mapping.
Throws
SQLException if a database access error occurs

public abstract int getParameterCount ()

Retrieves the number of parameters in the PreparedStatement object for which this ParameterMetaData object contains information.

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

public abstract int getParameterMode (int param)

Retrieves the designated parameter's mode.

Parameters
param the first parameter is 1, the second is 2, ...
Returns
  • mode of the parameter; one of ParameterMetaData.parameterModeIn, ParameterMetaData.parameterModeOut, or ParameterMetaData.parameterModeInOut ParameterMetaData.parameterModeUnknown.
Throws
SQLException if a database access error occurs

public abstract int getParameterType (int param)

Retrieves the designated parameter's SQL type.

Parameters
param the first parameter 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 getParameterTypeName (int param)

Retrieves the designated parameter's database-specific type name.

Parameters
param the first parameter is 1, the second is 2, ...
Returns
  • type the name used by the database. If the parameter 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 param)

Retrieves the designated parameter's specified column size.

The returned value represents the maximum column size for the given parameter. 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
param the first parameter is 1, the second is 2, ...
Returns
  • precision
Throws
SQLException if a database access error occurs

public abstract int getScale (int param)

Retrieves the designated parameter's number of digits to right of the decimal point. 0 is returned for data types where the scale is not applicable.

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

public abstract int