Interface ParameterMetaData
- All Superinterfaces:
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.
- Since:
- 1.4
-
Field Summary
Modifier and TypeFieldDescriptionstatic final int
The constant indicating that the parameter's mode is IN.static final int
The constant indicating that the parameter's mode is INOUT.static final int
The constant indicating that the parameter's mode is OUT.static final int
The constant indicating that the mode of the parameter is unknown.static final int
The constant indicating that a parameter will not allowNULL
values.static final int
The constant indicating that a parameter will allowNULL
values.static final int
The constant indicating that the nullability of a parameter is unknown. -
Method Summary
Modifier and TypeMethodDescriptiongetParameterClassName
(int param) Retrieves the fully-qualified name of the Java class whose instances should be passed to the methodPreparedStatement.setObject
.int
Retrieves the number of parameters in thePreparedStatement
object for which thisParameterMetaData
object contains information.int
getParameterMode
(int param) Retrieves the designated parameter's mode.int
getParameterType
(int param) Retrieves the designated parameter's SQL type.getParameterTypeName
(int param) Retrieves the designated parameter's database-specific type name.int
getPrecision
(int param) Retrieves the designated parameter's specified column size.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.int
isNullable
(int param) Retrieves whether null values are allowed in the designated parameter.boolean
isSigned
(int param) Retrieves whether values for the designated parameter can be signed numbers.Methods declared in interface java.sql.Wrapper
isWrapperFor, unwrap
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Field Details
-
parameterNoNulls
static final int parameterNoNullsThe constant indicating that a parameter will not allowNULL
values.- See Also:
-
parameterNullable
static final int parameterNullableThe constant indicating that a parameter will allowNULL
values.- See Also:
-
parameterNullableUnknown
static final int parameterNullableUnknownThe constant indicating that the nullability of a parameter is unknown.- See Also:
-
parameterModeUnknown
static final int parameterModeUnknownThe constant indicating that the mode of the parameter is unknown.- See Also:
-
parameterModeIn
static final int parameterModeInThe constant indicating that the parameter's mode is IN.- See Also:
-
parameterModeInOut
static final int parameterModeInOutThe constant indicating that the parameter's mode is INOUT.- See Also:
-
parameterModeOut
static final int parameterModeOutThe constant indicating that the parameter's mode is OUT.- See Also:
-
-
Method Details
-
getParameterCount
Retrieves the number of parameters in thePreparedStatement
object for which thisParameterMetaData
object contains information.- Returns:
- the number of parameters
- Throws:
SQLException
- if a database access error occurs- Since:
- 1.4
-
isNullable
Retrieves whether null values are allowed in the designated parameter.- Parameters:
param
- the first parameter is 1, the second is 2, ...- Returns:
- the nullability status of the given parameter; one of
ParameterMetaData.parameterNoNulls
,ParameterMetaData.parameterNullable
, orParameterMetaData.parameterNullableUnknown
- Throws:
SQLException
- if a database access error occurs- Since:
- 1.4
-
isSigned
Retrieves whether values for the designated parameter can be signed numbers.- Parameters:
param
- the first parameter is 1, the second is 2, ...- Returns:
true
if so;false
otherwise- Throws:
SQLException
- if a database access error occurs- Since:
- 1.4
-
getPrecision
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- Since:
- 1.4
-
getScale
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- Since:
- 1.4
-
getParameterType
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- Since:
- 1.4
- See Also:
-
getParameterTypeName
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- Since:
- 1.4
-
getParameterClassName
Retrieves the fully-qualified name of the Java class whose instances should be passed to the methodPreparedStatement.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- Since:
- 1.4
-
getParameterMode
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
, orParameterMetaData.parameterModeInOut
ParameterMetaData.parameterModeUnknown
. - Throws:
SQLException
- if a database access error occurs- Since:
- 1.4
-