Package org.apache.derby.impl.jdbc
Class EmbedParameterSetMetaData
- java.lang.Object
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- org.apache.derby.impl.jdbc.EmbedParameterSetMetaData
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- All Implemented Interfaces:
java.sql.ParameterMetaData
,java.sql.Wrapper
public class EmbedParameterSetMetaData extends java.lang.Object implements java.sql.ParameterMetaData
This class implements the ParameterMetaData interface from JDBC 3.0.
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Field Summary
Fields Modifier and Type Field Description private int
paramCount
private ParameterValueSet
pvs
private DataTypeDescriptor[]
types
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Constructor Summary
Constructors Modifier Constructor Description protected
EmbedParameterSetMetaData(ParameterValueSet pvs, DataTypeDescriptor[] types)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description private void
checkPosition(int parameterIndex)
java.lang.String
getParameterClassName(int param)
Retrieves the fully-qualified name of the Java class whose instances should be passed to the method PreparedStatement.setObject.int
getParameterCount()
Retrieves the number of parameters in the PreparedStatement object for which this ParameterMetaData object contains information.int
getParameterMode(int param)
Retrieves the designated parameter's mode.int
getParameterType(int param)
Retrieves the designated parameter's SQL type.java.lang.String
getParameterTypeName(int param)
Retrieves the designated parameter's database-specific type name.int
getPrecision(int param)
Retrieves the designated parameter's number of decimal digits.int
getScale(int param)
Retrieves the designated parameter's number of digits to right of the decimal point.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.boolean
isWrapperFor(java.lang.Class<?> iface)
Returns false unlessiface
is implemented.<T> T
unwrap(java.lang.Class<T> iface)
Returnsthis
if this class implements the specified interface.
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Field Detail
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pvs
private final ParameterValueSet pvs
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types
private final DataTypeDescriptor[] types
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paramCount
private final int paramCount
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Constructor Detail
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EmbedParameterSetMetaData
protected EmbedParameterSetMetaData(ParameterValueSet pvs, DataTypeDescriptor[] types)
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Method Detail
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getParameterCount
public int getParameterCount()
Retrieves the number of parameters in the PreparedStatement object for which this ParameterMetaData object contains information.- Specified by:
getParameterCount
in interfacejava.sql.ParameterMetaData
- Returns:
- the number of parameters
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isNullable
public int isNullable(int param) throws java.sql.SQLException
Retrieves whether null values are allowed in the designated parameter.- Specified by:
isNullable
in interfacejava.sql.ParameterMetaData
- 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, or ParameterMetaData.parameterNullableUnknown
- Throws:
java.sql.SQLException
- if a database access error occurs
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isSigned
public boolean isSigned(int param) throws java.sql.SQLException
Retrieves whether values for the designated parameter can be signed numbers.- Specified by:
isSigned
in interfacejava.sql.ParameterMetaData
- Parameters:
param
- - the first parameter is 1, the second is 2, ...- Returns:
- true if it can be signed numbers
- Throws:
java.sql.SQLException
- if a database access error occurs
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getPrecision
public int getPrecision(int param) throws java.sql.SQLException
Retrieves the designated parameter's number of decimal digits.- Specified by:
getPrecision
in interfacejava.sql.ParameterMetaData
- Parameters:
param
- - the first parameter is 1, the second is 2, ...- Returns:
- precision
- Throws:
java.sql.SQLException
- if a database access error occurs
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getScale
public int getScale(int param) throws java.sql.SQLException
Retrieves the designated parameter's number of digits to right of the decimal point.- Specified by:
getScale
in interfacejava.sql.ParameterMetaData
- Parameters:
param
- - the first parameter is 1, the second is 2, ...- Returns:
- scale
- Throws:
java.sql.SQLException
- if a database access error occurs
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getParameterType
public int getParameterType(int param) throws java.sql.SQLException
Retrieves the designated parameter's SQL type.- Specified by:
getParameterType
in interfacejava.sql.ParameterMetaData
- Parameters:
param
- - the first parameter is 1, the second is 2, ...- Returns:
- SQL type from java.sql.Types
- Throws:
java.sql.SQLException
- if a database access error occurs
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getParameterTypeName
public java.lang.String getParameterTypeName(int param) throws java.sql.SQLException
Retrieves the designated parameter's database-specific type name.- Specified by:
getParameterTypeName
in interfacejava.sql.ParameterMetaData
- 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:
java.sql.SQLException
- if a database access error occurs
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getParameterClassName
public java.lang.String getParameterClassName(int param) throws java.sql.SQLException
Retrieves the fully-qualified name of the Java class whose instances should be passed to the method PreparedStatement.setObject.- Specified by:
getParameterClassName
in interfacejava.sql.ParameterMetaData
- 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:
java.sql.SQLException
- if a database access error occurs
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getParameterMode
public int getParameterMode(int param) throws java.sql.SQLException
Retrieves the designated parameter's mode.- Specified by:
getParameterMode
in interfacejava.sql.ParameterMetaData
- 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:
java.sql.SQLException
- if a database access error occurs
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checkPosition
private void checkPosition(int parameterIndex) throws java.sql.SQLException
- Throws:
java.sql.SQLException
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isWrapperFor
public boolean isWrapperFor(java.lang.Class<?> iface) throws java.sql.SQLException
Returns false unlessiface
is implemented.- Specified by:
isWrapperFor
in interfacejava.sql.Wrapper
- Parameters:
iface
- a class defining an interface- Returns:
- true if this implements the interface or directly or indirectly wraps an object that does
- Throws:
java.sql.SQLException
- if an error occurs while determining whether this is a wrapper for an object with the given interface.
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unwrap
public <T> T unwrap(java.lang.Class<T> iface) throws java.sql.SQLException
Returnsthis
if this class implements the specified interface.- Specified by:
unwrap
in interfacejava.sql.Wrapper
- Parameters:
iface
- a class defining an interface- Returns:
- an object that implements the interface
- Throws:
java.sql.SQLException
- if no object is found that implements the interface
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