StructReader (Google Cloud 0.90.0-alpha API)

All Known Subinterfaces:

ResultSet

All Known Implementing Classes:

AbstractStructReader, ForwardingResultSet, ForwardingStructReader, Struct
```
public interface StructReader
```
A base interface for reading the fields of a STRUCT. The Cloud Spanner yields StructReader instances as one of the subclasses ResultSet or Struct, most commonly as the result of a read or query operation. At any point in time, a StructReader provides access to a single tuple of data comprising multiple typed columns. Each column may have a NULL or non-NULL value; in both cases, columns always have a type.
Column values are accessed using the getTypeName() methods; a set of methods exists for each Java type that a column may be read as, and depending on the type of the column, only a subset of those methods will be appropriate. For example, getString(int) and getString(String) exist for reading columns of type Type.string(); attempting to call those methods for columns of other types will result in an IllegalStateException. The getTypeName() methods should only be called for non-NULL values, otherwise a NullPointerException is raised; isNull(int)/isNull(String) can be used to test for NULL-ness if necessary.
All methods for accessing a column have overloads that accept an int column index and a String column name. Column indices are zero-based. The column name overloads will fail with IllegalArgumentException if the column name does not appear exactly once in this instance's getType(). The int overloads are typically more efficient than their String counterparts.
StructReader itself does not define whether the implementing type is mutable or immutable. For example, ResultSet is a mutable implementation of StructReader, where the StructReader methods provide access to the row that the result set is currently positioned over and ResultSet.next() changes that view to the next row, whereas Struct is an immutable implementation of StructReader.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`boolean`	`getBoolean(int columnIndex)` Returns the value of a non-`NULL` column with type `Type.bool()`.
`boolean`	`getBoolean(String columnName)` Returns the value of a non-`NULL` column with type `Type.bool()`.
`boolean[]`	`getBooleanArray(int columnIndex)` Returns the value of a non-`NULL` column with type `Type.array(Type.bool())`.
`boolean[]`	`getBooleanArray(String columnName)` Returns the value of a non-`NULL` column with type `Type.array(Type.bool())`.
`List<Boolean>`	`getBooleanList(int columnIndex)` Returns the value of a non-`NULL` column with type `Type.array(Type.bool())`.
`List<Boolean>`	`getBooleanList(String columnName)` Returns the value of a non-`NULL` column with type `Type.array(Type.bool())`.
`ByteArray`	`getBytes(int columnIndex)` Returns the value of a non-`NULL` column with type `Type.bytes()`.
`ByteArray`	`getBytes(String columnName)` Returns the value of a non-`NULL` column with type `Type.bytes()`.
`List<ByteArray>`	`getBytesList(int columnIndex)` Returns the value of a non-`NULL` column with type `Type.array(Type.bytes())`.
`List<ByteArray>`	`getBytesList(String columnName)` Returns the value of a non-`NULL` column with type `Type.array(Type.bytes())`.
`int`	`getColumnCount()` Returns the number of columns in the underlying data.
`int`	`getColumnIndex(String columnName)` Returns the index of the column named `columnName`.
`Type`	`getColumnType(int columnIndex)` Returns the type of a column.
`Type`	`getColumnType(String columnName)` Returns the type of a column.
`Date`	`getDate(int columnIndex)` Returns the value of a non-`NULL` column with type `Type.date()`.
`Date`	`getDate(String columnName)` Returns the value of a non-`NULL` column with type `Type.date()`.
`List<Date>`	`getDateList(int columnIndex)` Returns the value of a non-`NULL` column with type `Type.array(Type.date())`.
`List<Date>`	`getDateList(String columnName)` Returns the value of a non-`NULL` column with type `Type.array(Type.date())`.
`double`	`getDouble(int columnIndex)` Returns the value of a non-`NULL` column with type `Type.float64()`.
`double`	`getDouble(String columnName)` Returns the value of a non-`NULL` column with type `Type.float64()`.
`double[]`	`getDoubleArray(int columnIndex)` Returns the value of a non-`NULL` column with type `Type.array(Type.float64())`.
`double[]`	`getDoubleArray(String columnName)` Returns the value of a non-`NULL` column with type `Type.array(Type.float64())`.
`List<Double>`	`getDoubleList(int columnIndex)` Returns the value of a non-`NULL` column with type `Type.array(Type.float64())`.
`List<Double>`	`getDoubleList(String columnName)` Returns the value of a non-`NULL` column with type `Type.array(Type.float64())`.
`long`	`getLong(int columnIndex)` Returns the value of a non-`NULL` column with type `Type.int64()`.
`long`	`getLong(String columnName)` Returns the value of a non-`NULL` column with type `Type.int64()`.
`long[]`	`getLongArray(int columnIndex)` Returns the value of a non-`NULL` column with type `Type.array(Type.int64())`.
`long[]`	`getLongArray(String columnName)` Returns the value of a non-`NULL` column with type `Type.array(Type.int64())`.
`List<Long>`	`getLongList(int columnIndex)` Returns the value of a non-`NULL` column with type `Type.array(Type.int64())`.
`List<Long>`	`getLongList(String columnName)` Returns the value of a non-`NULL` column with type `Type.array(Type.int64())`.
`String`	`getString(int columnIndex)` Returns the value of a non-`NULL` column with type `Type.string()`.
`String`	`getString(String columnName)` Returns the value of a non-`NULL` column with type `Type.string()`.
`List<String>`	`getStringList(int columnIndex)` Returns the value of a non-`NULL` column with type `Type.array(Type.string())`.
`List<String>`	`getStringList(String columnName)` Returns the value of a non-`NULL` column with type `Type.array(Type.string())`.
`List<Struct>`	`getStructList(int columnIndex)` Returns the value of a non-`NULL` column with type `Type.array(Type.struct(...))`.
`List<Struct>`	`getStructList(String columnName)` Returns the value of a non-`NULL` column with type `Type.array(Type.struct(...))`.
`Timestamp`	`getTimestamp(int columnIndex)` Returns the value of a non-`NULL` column with type `Type.timestamp()`.
`Timestamp`	`getTimestamp(String columnName)` Returns the value of a non-`NULL` column with type `Type.timestamp()`.
`List<Timestamp>`	`getTimestampList(int columnIndex)` Returns the value of a non-`NULL` column with type `Type.array(Type.timestamp())`.
`List<Timestamp>`	`getTimestampList(String columnName)` Returns the value of a non-`NULL` column with type `Type.array(Type.timestamp())`.
`Type`	`getType()` Returns the type of the underlying data.
`boolean`	`isNull(int columnIndex)` Returns `true` if a column contains a `NULL` value.
`boolean`	`isNull(String columnName)` Returns `true` if a column contains a `NULL` value.

- Method Detail
  - getType
```
Type getType()
```
    Returns the type of the underlying data. This will always be a STRUCT type, with fields corresponding to the data's columns. For the result of a read or query, this will always match the columns passed to the read() call or named in the query text, in order.
  - getColumnCount
```
int getColumnCount()
```
    Returns the number of columns in the underlying data. This includes any columns with NULL values.
  - getColumnIndex
```
int getColumnIndex(String columnName)
```
    Returns the index of the column named columnName.
    
    Throws:
    
    IllegalArgumentException - if there is not exactly one element of type().structFields() with Type.StructField.getName() equal to columnName
  - getColumnType
```
Type getColumnType(int columnIndex)
```
    Returns the type of a column.
  - getColumnType
```
Type getColumnType(String columnName)
```
    Returns the type of a column.
  - isNull
```
boolean isNull(int columnIndex)
```
    Returns true if a column contains a NULL value.
  - isNull
```
boolean isNull(String columnName)
```
    Returns true if a column contains a NULL value.
  - getBoolean
```
boolean getBoolean(int columnIndex)
```
    Returns the value of a non-NULL column with type Type.bool().
  - getBoolean
```
boolean getBoolean(String columnName)
```
    Returns the value of a non-NULL column with type Type.bool().
  - getLong
```
long getLong(int columnIndex)
```
    Returns the value of a non-NULL column with type Type.int64().
  - getLong
```
long getLong(String columnName)
```
    Returns the value of a non-NULL column with type Type.int64().
  - getDouble
```
double getDouble(int columnIndex)
```
    Returns the value of a non-NULL column with type Type.float64().
  - getDouble
```
double getDouble(String columnName)
```
    Returns the value of a non-NULL column with type Type.float64().
  - getString
```
String getString(int columnIndex)
```
    Returns the value of a non-NULL column with type Type.string().
  - getString
```
String getString(String columnName)
```
    Returns the value of a non-NULL column with type Type.string().
  - getBytes
```
ByteArray getBytes(int columnIndex)
```
    Returns the value of a non-NULL column with type Type.bytes().
  - getBytes
```
ByteArray getBytes(String columnName)
```
    Returns the value of a non-NULL column with type Type.bytes().
  - getTimestamp
```
Timestamp getTimestamp(int columnIndex)
```
    Returns the value of a non-NULL column with type Type.timestamp().
  - getTimestamp
```
Timestamp getTimestamp(String columnName)
```
    Returns the value of a non-NULL column with type Type.timestamp().
  - getDate
```
Date getDate(int columnIndex)
```
    Returns the value of a non-NULL column with type Type.date().
  - getDate
```
Date getDate(String columnName)
```
    Returns the value of a non-NULL column with type Type.date().
  - getBooleanArray
```
boolean[] getBooleanArray(int columnIndex)
```
    Returns the value of a non-NULL column with type Type.array(Type.bool()).
    
    Throws:
    
    NullPointerException - if any element of the array value is NULL. If the array may contain NULL values, use getBooleanList(int) instead.
  - getBooleanArray
```
boolean[] getBooleanArray(String columnName)
```
    Returns the value of a non-NULL column with type Type.array(Type.bool()).
    
    Throws:
    
    NullPointerException - if any element of the array value is NULL. If the array may contain NULL values, use getBooleanList(String) instead.
  - getBooleanList
```
List<Boolean> getBooleanList(int columnIndex)
```
    Returns the value of a non-NULL column with type Type.array(Type.bool()).
  - getBooleanList
```
List<Boolean> getBooleanList(String columnName)
```
    Returns the value of a non-NULL column with type Type.array(Type.bool()).
  - getLongArray
```
long[] getLongArray(int columnIndex)
```
    Returns the value of a non-NULL column with type Type.array(Type.int64()).
    
    Throws:
    
    NullPointerException - if any element of the array value is NULL. If the array may contain NULL values, use getLongList(int) instead.
  - getLongArray
```
long[] getLongArray(String columnName)
```
    Returns the value of a non-NULL column with type Type.array(Type.int64()).
    
    Throws:
    
    NullPointerException - if any element of the array value is NULL. If the array may contain NULL values, use getLongList(String) instead.
  - getLongList
```
List<Long> getLongList(int columnIndex)
```
    Returns the value of a non-NULL column with type Type.array(Type.int64()).
  - getLongList
```
List<Long> getLongList(String columnName)
```
    Returns the value of a non-NULL column with type Type.array(Type.int64()).
  - getDoubleArray
```
double[] getDoubleArray(int columnIndex)
```
    Returns the value of a non-NULL column with type Type.array(Type.float64()).
    
    Throws:
    
    NullPointerException - if any element of the array value is NULL. If the array may contain NULL values, use getDoubleList(int) instead.
  - getDoubleArray
```
double[] getDoubleArray(String columnName)
```
    Returns the value of a non-NULL column with type Type.array(Type.float64()).
    
    Throws:
    
    NullPointerException - if any element of the array value is NULL. If the array may contain NULL values, use getDoubleList(String) instead.
  - getDoubleList
```
List<Double> getDoubleList(int columnIndex)
```
    Returns the value of a non-NULL column with type Type.array(Type.float64()).
  - getDoubleList
```
List<Double> getDoubleList(String columnName)
```
    Returns the value of a non-NULL column with type Type.array(Type.float64()).
  - getStringList
```
List<String> getStringList(int columnIndex)
```
    Returns the value of a non-NULL column with type Type.array(Type.string()).
  - getStringList
```
List<String> getStringList(String columnName)
```
    Returns the value of a non-NULL column with type Type.array(Type.string()).
  - getBytesList
```
List<ByteArray> getBytesList(int columnIndex)
```
    Returns the value of a non-NULL column with type Type.array(Type.bytes()).
  - getBytesList
```
List<ByteArray> getBytesList(String columnName)
```
    Returns the value of a non-NULL column with type Type.array(Type.bytes()).
  - getTimestampList
```
List<Timestamp> getTimestampList(int columnIndex)
```
    Returns the value of a non-NULL column with type Type.array(Type.timestamp()).
  - getTimestampList
```
List<Timestamp> getTimestampList(String columnName)
```
    Returns the value of a non-NULL column with type Type.array(Type.timestamp()).
  - getDateList
```
List<Date> getDateList(int columnIndex)
```
    Returns the value of a non-NULL column with type Type.array(Type.date()).
  - getDateList
```
List<Date> getDateList(String columnName)
```
    Returns the value of a non-NULL column with type Type.array(Type.date()).
  - getStructList
```
List<Struct> getStructList(int columnIndex)
```
    Returns the value of a non-NULL column with type Type.array(Type.struct(...)).
  - getStructList
```
List<Struct> getStructList(String columnName)
```
    Returns the value of a non-NULL column with type Type.array(Type.struct(...)).

Interface StructReader

Method Summary

Method Detail

getType

getColumnCount

getColumnIndex

getColumnType

getColumnType

isNull

isNull

getBoolean

getBoolean

getLong

getLong

getDouble

getDouble

getString

getString

getBytes

getBytes

getTimestamp

getTimestamp

getDate

getDate

getBooleanArray

getBooleanArray

getBooleanList

getBooleanList

getLongArray

getLongArray

getLongList

getLongList

getDoubleArray

getDoubleArray

getDoubleList

getDoubleList

getStringList

getStringList

getBytesList

getBytesList

getTimestampList

getTimestampList

getDateList

getDateList

getStructList

getStructList