Module java.sql
Package java.sql

Interface ParameterMetaData

All Superinterfaces:
Wrapper
public interfaceParameterMetaDataextendsWrapper
An object that can be used to get information about the types and properties for each parameter marker in aPreparedStatement object. For some queries and driver implementations, the data that would be returned by aParameterMetaData object may not be available until thePreparedStatement has been executed.

Some driver implementations may not be able to provide information about thetypes and properties for each parameter marker in aCallableStatementobject.

Since:
1.4

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static 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 Type
    Method
    Description
    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.
    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

  • Field Details

    • parameterNoNulls

      static final int parameterNoNulls
      The constant indicating that a parameter will not allowNULL values.
      See Also:

    • parameterNullable

      static final int parameterNullable
      The constant indicating that a parameter will allowNULL values.
      See Also:

    • parameterNullableUnknown

      static final int parameterNullableUnknown
      The constant indicating that the nullability of a parameter is unknown.
      See Also:

    • parameterModeUnknown

      static final int parameterModeUnknown
      The constant indicating that the mode of the parameter is unknown.
      See Also:

    • parameterModeIn

      static final int parameterModeIn
      The constant indicating that the parameter's mode is IN.
      See Also:

    • parameterModeInOut

      static final int parameterModeInOut
      The constant indicating that the parameter's mode is INOUT.
      See Also:

    • parameterModeOut

      static final int parameterModeOut
      The constant indicating that the parameter's mode is OUT.
      See Also:

  • Method Details

    • getParameterCount

      int getParameterCount() throwsSQLException
      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

      int isNullable(int param) throwsSQLException
      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 ofParameterMetaData.parameterNoNulls,ParameterMetaData.parameterNullable, orParameterMetaData.parameterNullableUnknown
      Throws:
      SQLException - if a database access error occurs
      Since:
      1.4

    • isSigned

      boolean isSigned(int param) throwsSQLException
      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) throwsSQLException
      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) throwsSQLException
      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) throwsSQLException
      Retrieves the designated parameter's SQL type.
      Parameters:
      param - the first parameter is 1, the second is 2, ...
      Returns:
      SQL type fromjava.sql.Types
      Throws:
      SQLException - if a database access error occurs
      Since:
      1.4
      See Also:

    • getParameterTypeName

      String getParameterTypeName(int param) throwsSQLException
      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) throwsSQLException
      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 methodPreparedStatement.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) throwsSQLException
      Retrieves the designated parameter's mode.
      Parameters:
      param - the first parameter is 1, the second is 2, ...
      Returns:
      mode of the parameter; one ofParameterMetaData.parameterModeIn,ParameterMetaData.parameterModeOut, orParameterMetaData.parameterModeInOutParameterMetaData.parameterModeUnknown.
      Throws:
      SQLException - if a database access error occurs
      Since:
      1.4