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Java Standard Edition (SE)

ParameterMetaData


compact2, compact3
java.sql

Interface ParameterMetaData

  • All Superinterfaces:
    Wrapper


    public interface ParameterMetaData
    extends 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

      Fields 
      Modifier and Type Field and Description
      static int parameterModeIn
      The constant indicating that the parameter's mode is IN.
      static int parameterModeInOut
      The constant indicating that the parameter's mode is INOUT.
      static int parameterModeOut
      The constant indicating that the parameter's mode is OUT.
      static int parameterModeUnknown
      The constant indicating that the mode of the parameter is unknown.
      static int parameterNoNulls
      The constant indicating that a parameter will not allow NULL values.
      static int parameterNullable
      The constant indicating that a parameter will allow NULL values.
      static int parameterNullableUnknown
      The constant indicating that the nullability of a parameter is unknown.
    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method and Description
      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.
      String 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.
      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.
    • Field Detail

      • parameterNoNulls

        static final int parameterNoNulls
        The constant indicating that a parameter will not allow NULL values.
        See Also:
        Constant Field Values
      • parameterNullable

        static final int parameterNullable
        The constant indicating that a parameter will allow NULL values.
        See Also:
        Constant Field Values
      • parameterNullableUnknown

        static final int parameterNullableUnknown
        The constant indicating that the nullability of a parameter is unknown.
        See Also:
        Constant Field Values
      • parameterModeUnknown

        static final int parameterModeUnknown
        The constant indicating that the mode of the parameter is unknown.
        See Also:
        Constant Field Values
      • parameterModeIn

        static final int parameterModeIn
        The constant indicating that the parameter's mode is IN.
        See Also:
        Constant Field Values
      • parameterModeInOut

        static final int parameterModeInOut
        The constant indicating that the parameter's mode is INOUT.
        See Also:
        Constant Field Values
      • parameterModeOut

        static final int parameterModeOut
        The constant indicating that the parameter's mode is OUT.
        See Also:
        Constant Field Values
    • Method Detail

      • getParameterCount

        int getParameterCount()
                       throws SQLException
        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
        Since:
        1.4
      • isNullable

        int isNullable(int param)
                throws SQLException
        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, or ParameterMetaData.parameterNullableUnknown
        Throws:
        SQLException - if a database access error occurs
        Since:
        1.4
      • isSigned

        boolean isSigned(int param)
                  throws SQLException
        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

        int getPrecision(int param)
                  throws SQLException
        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

        int getScale(int param)
              throws SQLException
        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

        int getParameterType(int param)
                      throws SQLException
        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:
        Types
      • getParameterTypeName

        String getParameterTypeName(int param)
                             throws SQLException
        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

        String getParameterClassName(int param)
                              throws SQLException
        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
        Since:
        1.4
      • getParameterMode

        int getParameterMode(int param)
                      throws SQLException
        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
        Since:
        1.4


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