H2 Database Engine 2.3.232 · org.h2.table.Column · APIdia, the JavaDoc alternative

Modifier and Type	Field and Description
private int	columnId
private String	comment
private Expression	defaultExpression
private boolean	defaultOnNull
private Domain	domain
private GeneratedColumnResolver	generatedTableFilter
private SequenceOptions	identityOptions
private boolean	isGeneratedAlways
private String	name
public static final int	NOT_NULLABLE This column is not nullable.
public static final int	NULLABLE This column is nullable.
private boolean	nullable
public static final int	NULLABLE_UNKNOWN It is not know whether this column is nullable.
private Expression	onUpdateExpression
private boolean	primaryKey
public static final String	ROWID The name of the rowid pseudo column.
private boolean	rowId
private int	selectivity
private Sequence	sequence
private Table	table
private TypeInfo	type
private boolean	visible

Access	Constructor and Description
public	Column(String name, TypeInfo type)
public	Column(String name, TypeInfo type, Table table, int columnId)

Method Summary

Modifier and Type	Method and Description
public Value	Returns: the value convert(CastDataProvider the cast information provider provider, Value the value v) Convert a value to this column's type without precision and scale checks.
public static ValueRow	Returns: a ValueRow which contains the converted values convert(CastDataProvider the cast information provider provider, Column[] the column info list used for the conversation columns, ValueRow the holder of the values valueRow) Converts the values in a ValueRow based on the passed column info.
public void	copy(Column the source column source) Copy the data of the source column into the current column.
public boolean	equals(Object the reference object with which to compare. o) Overrides java.lang.Object.equals. Indicates whether some other object is "equal to" this one.
public Column	getClone()
public int	getColumnId()
public String	getComment()
public String	getCreateSQL()
public String	Returns: the SQL statement getCreateSQL(boolean whether this is for the metadata table forMeta) Get this columns part of CREATE TABLE SQL statement.
private String	getCreateSQL(StringBuilder builder, boolean forMeta)
public String	getCreateSQLWithoutName()
private DbException	getDataConversionError(Value value, DbException cause)
public Expression	getDefaultExpression() Implements org.h2.table.ColumnTemplate.getDefaultExpression.
private Value	getDefaultOrGenerated(SessionLocal session, Row row)
public String	getDefaultSQL() Implements org.h2.table.ColumnTemplate.getDefaultSQL.
public Domain	getDomain() Implements org.h2.table.ColumnTemplate.getDomain.
public Expression	getEffectiveDefaultExpression() Implements org.h2.table.ColumnTemplate.getEffectiveDefaultExpression.
public Expression	getEffectiveOnUpdateExpression() Implements org.h2.table.ColumnTemplate.getEffectiveOnUpdateExpression.
public SequenceOptions	Returns: identity column options, or `null` getIdentityOptions() Returns identity column options, or `null` if sequence was already created or this column is not an identity column.
public String	getName()
public Expression	getOnUpdateExpression() Implements org.h2.table.ColumnTemplate.getOnUpdateExpression.
public String	getOnUpdateSQL() Implements org.h2.table.ColumnTemplate.getOnUpdateSQL.
public int	Returns: the selectivity getSelectivity() Get the selectivity of the column.
public Sequence	getSequence()
public String	getSQL(int formatting flags sqlFlags) Overrides default org.h2.util.HasSQL.getSQL. Get the SQL statement of this expression.
public StringBuilder	getSQL(StringBuilder string builder builder, int formatting flags sqlFlags) Implements org.h2.util.HasSQL.getSQL. Appends the SQL statement of this object to the specified builder.
public StringBuilder	Returns: the specified string builder getSQLWithTable(StringBuilder the string builder builder, int formatting flags sqlFlags) Appends the table name and column name to the specified builder.
public Table	getTable()
public TypeInfo	getType() Implements org.h2.value.Typed.getType. Returns the data type.
public boolean	getVisible()
public int	hashCode() Overrides java.lang.Object.hashCode. Returns a hash code value for this object.
public boolean	Returns: true if yes hasIdentityOptions() Whether the column has any identity options.
public void	initializeSequence(SessionLocal the session session, Schema the schema where the sequence should be generated schema, int the object id id, boolean true if the sequence is temporary and does not need to be stored temporary) Initialize the sequence for this column.
public boolean	isDefaultOnNull()
pack-priv boolean	Returns: true if every visited expression returned true, or if there are no expressions isEverything(ExpressionVisitor the visitor visitor) Visit the default expression, the check constraint, and the sequence (if any).
public boolean	Returns: whether this column is a generated column isGenerated() Returns whether this column is a generated column.
public boolean	Returns: whether this column is a generated column or always generated identity column isGeneratedAlways() Returns whether this column is a generated column or always generated identity column.
public boolean	Returns: whether this column is an identity column isIdentity() Returns whether this column is an identity column.
public boolean	isNullable()
public boolean	isPrimaryKey()
public boolean	Returns: true for _ROWID_ column, false otherwise isRowId() Returns whether this column is a row identity column.
public boolean	Returns: true if the new column is compatible isWideningConversion(Column the new (target) column newColumn) Check whether the new column is of the same type and not more restricted than this column.
public void	prepareExpressions(SessionLocal the session session) Implements org.h2.table.ColumnTemplate.prepareExpressions. Prepare all expressions of this column or domain.
private void	removeNonIdentityProperties()
public void	rename(String the new column name newName) Rename the column.
public void	setComment(String comment)
public void	setDefaultExpression(SessionLocal the session session, Expression the default expression defaultExpression) Implements org.h2.table.ColumnTemplate.setDefaultExpression. Set the default expression.
public void	setDefaultOnNull(boolean defaultOnNull)
public void	setDomain(Domain domain) Implements org.h2.table.ColumnTemplate.setDomain.
public void	setGeneratedExpression(Expression the computed expression expression) Set the default value in the form of a generated expression of other columns.
public void	setIdentityOptions(SequenceOptions identity column options identityOptions, boolean whether value should be always generated generatedAlways) Set the identity options of this column.
public void	setNullable(boolean b)
public void	setOnUpdateExpression(SessionLocal the session session, Expression the on update expression onUpdateExpression) Implements org.h2.table.ColumnTemplate.setOnUpdateExpression. Set the on update expression.
public void	setPrimaryKey(boolean primaryKey)
public void	setRowId(boolean true _ROWID_ column, false otherwise rowId) Set row identity flag.
public void	setSelectivity(int the new value selectivity) Set the new selectivity of a column.
public void	setSequence(Sequence the sequence sequence, boolean whether the value of the sequence is always used generatedAlways) Set the sequence to generate the value.
public void	setTable(Table the table table, int the column index columnId) Set the table and column id.
public void	setVisible(boolean b)
public String	toString() Overrides java.lang.Object.toString. Returns a string representation of the object.
private void	updateSequenceIfRequired(SessionLocal session, long value)
pack-priv Value	Returns: the new or converted value validateConvertUpdateSequence(SessionLocal the session session, Value the value or null value, Row the row row) Validate the value, convert it if required, and update the sequence value if required.
public static StringBuilder	Returns: the specified string builder writeColumns(StringBuilder string builder builder, Column[] columns columns, int formatting flags sqlFlags) Appends the specified columns to the specified builder.
public static StringBuilder	Returns: the specified string builder writeColumns(StringBuilder string builder builder, Column[] columns columns, String separator separator, String additional SQL to append after each column suffix, int formatting flags sqlFlags) Appends the specified columns to the specified builder.

Inherited from java.lang.Object:: clone finalize getClass notify notifyAll wait wait wait

columnId	back to summary
private int columnId

comment	back to summary
private String comment

defaultExpression	back to summary
private Expression defaultExpression

defaultOnNull	back to summary
private boolean defaultOnNull

domain	back to summary
private Domain domain

generatedTableFilter	back to summary
private GeneratedColumnResolver generatedTableFilter

identityOptions	back to summary
private SequenceOptions identityOptions

isGeneratedAlways	back to summary
private boolean isGeneratedAlways

name	back to summary
private String name

NOT_NULLABLE	back to summary
public static final int NOT_NULLABLE This column is not nullable.

NULLABLE	back to summary
public static final int NULLABLE This column is nullable.

nullable	back to summary
private boolean nullable

NULLABLE_UNKNOWN	back to summary
public static final int NULLABLE_UNKNOWN It is not know whether this column is nullable.

onUpdateExpression	back to summary
private Expression onUpdateExpression

primaryKey	back to summary
private boolean primaryKey

ROWID	back to summary
public static final String ROWID The name of the rowid pseudo column.

rowId	back to summary
private boolean rowId

selectivity	back to summary
private int selectivity

sequence	back to summary
private Sequence sequence

table	back to summary
private Table table

type	back to summary
private TypeInfo type

visible	back to summary
private boolean visible

Column	back to summary
public Column(String name, TypeInfo type)

Column	back to summary
public Column(String name, TypeInfo type, Table table, int columnId)

Method Detail

convert	back to summary
public Value convert(CastDataProvider provider, Value v) Convert a value to this column's type without precision and scale checks. Parameters provider:CastDataProvider the cast information provider v:Value the value Returns:Value the value

convert

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public Value convert(CastDataProvider provider, Value v)

Convert a value to this column's type without precision and scale checks.

Parameters

provider:CastDataProvider: the cast information provider
v:Value: the value

Returns:Value

the value

convert back to summary

convert	back to summary
public static ValueRow convert(CastDataProvider provider, Column[] columns, ValueRow valueRow) Converts the values in a ValueRow based on the passed column info. Creates a new instance if any of the contained item must be converted. Otherwise, returns the same `valueRow`. Parameters provider:CastDataProvider the cast information provider columns:Column[] the column info list used for the conversation valueRow:ValueRow the holder of the values Returns:ValueRow a ValueRow which contains the converted values See Also `Column#convert(CastDataProvider, Value)`

public static ValueRow convert(CastDataProvider provider, Column[] columns, ValueRow valueRow)

Converts the values in a ValueRow based on the passed column info. Creates a new instance if any of the contained item must be converted. Otherwise, returns the same valueRow.

Parameters

provider:CastDataProvider: the cast information provider
columns:Column[]: the column info list used for the conversation
valueRow:ValueRow: the holder of the values

Returns:ValueRow

a ValueRow which contains the converted values

copy	back to summary
public void copy(Column source) Copy the data of the source column into the current column. Parameters source:Column the source column

copy

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public void copy(Column source)

Copy the data of the source column into the current column.

Parameters

source:Column: the source column

equals back to summary

equals	back to summary
public boolean equals(Object o) Overrides java.lang.Object.equals. Doc from java.lang.Object.equals. Indicates whether some other object is "equal to" this one. The `equals` method implements an equivalence relation on non-null object references: It is reflexive: for any non-null reference value `x`, `x.equals(x)` should return `true`. It is symmetric: for any non-null reference values `x` and `y`, `x.equals(y)` should return `true` if and only if `y.equals(x)` returns `true`. It is transitive: for any non-null reference values `x`, `y`, and `z`, if `x.equals(y)` returns `true` and `y.equals(z)` returns `true`, then `x.equals(z)` should return `true`. It is consistent: for any non-null reference values `x` and `y`, multiple invocations of `x.equals(y)` consistently return `true` or consistently return `false`, provided no information used in `equals` comparisons on the objects is modified. For any non-null reference value `x`, `x.equals(null)` should return `false`. An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes. Parameters o:Object the reference object with which to compare. Returns:boolean `true` if this object is the same as the obj argument; `false` otherwise. Annotations @Override

public boolean equals(Object o)

Overrides java.lang.Object.equals.

Doc from java.lang.Object.equals.

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

It is reflexive: for any non-null reference value x, x.equals(x) should return true.
It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
For any non-null reference value x, x.equals(null) should return false.

An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.

Parameters

o:Object: the reference object with which to compare.

Returns:boolean

true if this object is the same as the obj argument; false otherwise.

Annotations

@Override

getClone	back to summary
public Column getClone()

getColumnId	back to summary
public int getColumnId()

getComment	back to summary
public String getComment()

getCreateSQL	back to summary
public String getCreateSQL()

getCreateSQL	back to summary
public String getCreateSQL(boolean forMeta) Get this columns part of CREATE TABLE SQL statement. Parameters forMeta:boolean whether this is for the metadata table Returns:String the SQL statement

getCreateSQL

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public String getCreateSQL(boolean forMeta)

Get this columns part of CREATE TABLE SQL statement.

Parameters

forMeta:boolean: whether this is for the metadata table

Returns:String

the SQL statement

getCreateSQL	back to summary
private String getCreateSQL(StringBuilder builder, boolean forMeta)

getCreateSQLWithoutName	back to summary
public String getCreateSQLWithoutName()

getDataConversionError	back to summary
private DbException getDataConversionError(Value value, DbException cause)

getDefaultExpression	back to summary
public Expression getDefaultExpression() Implements org.h2.table.ColumnTemplate.getDefaultExpression. Annotations @Override

getDefaultExpression

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public Expression getDefaultExpression()

Implements org.h2.table.ColumnTemplate.getDefaultExpression.

Annotations

@Override

getDefaultOrGenerated	back to summary
private Value getDefaultOrGenerated(SessionLocal session, Row row)

getDefaultSQL	back to summary
public String getDefaultSQL() Implements org.h2.table.ColumnTemplate.getDefaultSQL. Annotations @Override

getDefaultSQL

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public String getDefaultSQL()

Implements org.h2.table.ColumnTemplate.getDefaultSQL.

Annotations

@Override

getDomain	back to summary
public Domain getDomain() Implements org.h2.table.ColumnTemplate.getDomain. Annotations @Override

getDomain

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public Domain getDomain()

Implements org.h2.table.ColumnTemplate.getDomain.

Annotations

@Override

getEffectiveDefaultExpression	back to summary
public Expression getEffectiveDefaultExpression() Implements org.h2.table.ColumnTemplate.getEffectiveDefaultExpression. Annotations @Override

getEffectiveDefaultExpression

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public Expression getEffectiveDefaultExpression()

Implements org.h2.table.ColumnTemplate.getEffectiveDefaultExpression.

Annotations

@Override

getEffectiveOnUpdateExpression	back to summary
public Expression getEffectiveOnUpdateExpression() Implements org.h2.table.ColumnTemplate.getEffectiveOnUpdateExpression. Annotations @Override

getEffectiveOnUpdateExpression

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public Expression getEffectiveOnUpdateExpression()

Implements org.h2.table.ColumnTemplate.getEffectiveOnUpdateExpression.

Annotations

@Override

getIdentityOptions back to summary

getIdentityOptions	back to summary
public SequenceOptions getIdentityOptions() Returns identity column options, or `null` if sequence was already created or this column is not an identity column. Returns:SequenceOptions identity column options, or `null`

public SequenceOptions getIdentityOptions()

Returns identity column options, or null if sequence was already created or this column is not an identity column.

Returns:SequenceOptions: identity column options, or null

getName	back to summary
public String getName()

getOnUpdateExpression	back to summary
public Expression getOnUpdateExpression() Implements org.h2.table.ColumnTemplate.getOnUpdateExpression. Annotations @Override

getOnUpdateExpression

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public Expression getOnUpdateExpression()

Implements org.h2.table.ColumnTemplate.getOnUpdateExpression.

Annotations

@Override

getOnUpdateSQL	back to summary
public String getOnUpdateSQL() Implements org.h2.table.ColumnTemplate.getOnUpdateSQL. Annotations @Override

getOnUpdateSQL

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public String getOnUpdateSQL()

Implements org.h2.table.ColumnTemplate.getOnUpdateSQL.

Annotations

@Override

getSelectivity	back to summary
public int getSelectivity() Get the selectivity of the column. Selectivity 100 means values are unique, 10 means every distinct value appears 10 times on average. Returns:int the selectivity

getSelectivity

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public int getSelectivity()

Get the selectivity of the column. Selectivity 100 means values are unique, 10 means every distinct value appears 10 times on average.

Returns:int: the selectivity

getSequence	back to summary
public Sequence getSequence()

getSQL

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public String getSQL(int sqlFlags)

Overrides default org.h2.util.HasSQL.getSQL.

Doc from org.h2.util.HasSQL.getSQL.

Get the SQL statement of this expression. This may not always be the original SQL statement, specially after optimization.

Parameters

sqlFlags:int: formatting flags

Returns:String

the SQL statement

Annotations

@Override

getSQL

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public StringBuilder getSQL(StringBuilder builder, int sqlFlags)

Implements org.h2.util.HasSQL.getSQL.

Doc from org.h2.util.HasSQL.getSQL.

Appends the SQL statement of this object to the specified builder.

Parameters

builder:StringBuilder: string builder
sqlFlags:int: formatting flags

Returns:StringBuilder

the specified string builder

Annotations

@Override

getSQLWithTable

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public StringBuilder getSQLWithTable(StringBuilder builder, int sqlFlags)

Appends the table name and column name to the specified builder.

Parameters

builder:StringBuilder: the string builder
sqlFlags:int: formatting flags

Returns:StringBuilder

the specified string builder

getTable	back to summary
public Table getTable()

getType

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public TypeInfo getType()

Implements org.h2.value.Typed.getType.

Doc from org.h2.value.Typed.getType.

Returns the data type.

Returns:TypeInfo

the data type

Annotations

@Override

getVisible	back to summary
public boolean getVisible()

hashCode back to summary

public int hashCode()

Overrides java.lang.Object.hashCode.

Doc from java.lang.Object.hashCode.

Returns a hash code value for this object. This method is supported for the benefit of hash tables such as those provided by java.util.HashMap.

The general contract of hashCode is:

Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
If two objects are equal according to the equals method, then calling the hashCode method on each of the two objects must produce the same integer result.
It is not required that if two objects are unequal according to the equals method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

Returns:int

a hash code value for this object

Annotations

@Override

hasIdentityOptions

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public boolean hasIdentityOptions()

Whether the column has any identity options.

Returns:boolean: true if yes

initializeSequence

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public void initializeSequence(SessionLocal session, Schema schema, int id, boolean temporary)

Initialize the sequence for this column.

Parameters

session:SessionLocal: the session
schema:Schema: the schema where the sequence should be generated
id:int: the object id
temporary:boolean: true if the sequence is temporary and does not need to be stored

isDefaultOnNull	back to summary
public boolean isDefaultOnNull()

isEverything

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pack-priv boolean isEverything(ExpressionVisitor visitor)

Visit the default expression, the check constraint, and the sequence (if any).

Parameters

visitor:ExpressionVisitor: the visitor

Returns:boolean

true if every visited expression returned true, or if there are no expressions

isGenerated

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public boolean isGenerated()

Returns whether this column is a generated column.

Returns:boolean: whether this column is a generated column

isGeneratedAlways

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public boolean isGeneratedAlways()

Returns whether this column is a generated column or always generated identity column.

Returns:boolean: whether this column is a generated column or always generated identity column

isIdentity

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public boolean isIdentity()

Returns whether this column is an identity column.

Returns:boolean: whether this column is an identity column

isNullable	back to summary
public boolean isNullable()

isPrimaryKey	back to summary
public boolean isPrimaryKey()

isRowId

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public boolean isRowId()

Returns whether this column is a row identity column.

Returns:boolean: true for _ROWID_ column, false otherwise

isWideningConversion

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public boolean isWideningConversion(Column newColumn)

Check whether the new column is of the same type and not more restricted than this column.

Parameters

newColumn:Column: the new (target) column

Returns:boolean

true if the new column is compatible

prepareExpressions

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public void prepareExpressions(SessionLocal session)

Implements org.h2.table.ColumnTemplate.prepareExpressions.

Doc from org.h2.table.ColumnTemplate.prepareExpressions.

Prepare all expressions of this column or domain.

Parameters

session:SessionLocal: the session

Annotations

@Override

removeNonIdentityProperties	back to summary
private void removeNonIdentityProperties()

rename

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public void rename(String newName)

Rename the column. This method will only set the column name to the new value.

Parameters

newName:String: the new column name

setComment	back to summary
public void setComment(String comment)

setDefaultExpression

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public void setDefaultExpression(SessionLocal session, Expression defaultExpression)

Implements org.h2.table.ColumnTemplate.setDefaultExpression.

Doc from org.h2.table.ColumnTemplate.setDefaultExpression.

Set the default expression.

Parameters

session:SessionLocal: the session
defaultExpression:Expression: the default expression

Annotations

@Override

setDefaultOnNull	back to summary
public void setDefaultOnNull(boolean defaultOnNull)

setDomain

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public void setDomain(Domain domain)

Implements org.h2.table.ColumnTemplate.setDomain.

Annotations

@Override

setGeneratedExpression

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public void setGeneratedExpression(Expression expression)

Set the default value in the form of a generated expression of other columns.

Parameters

expression:Expression: the computed expression

setIdentityOptions

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public void setIdentityOptions(SequenceOptions identityOptions, boolean generatedAlways)

Set the identity options of this column.

Parameters

identityOptions:SequenceOptions: identity column options
generatedAlways:boolean: whether value should be always generated

setNullable	back to summary
public void setNullable(boolean b)

setOnUpdateExpression

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public void setOnUpdateExpression(SessionLocal session, Expression onUpdateExpression)

Implements org.h2.table.ColumnTemplate.setOnUpdateExpression.

Doc from org.h2.table.ColumnTemplate.setOnUpdateExpression.

Set the on update expression.

Parameters

session:SessionLocal: the session
onUpdateExpression:Expression: the on update expression

Annotations

@Override

setPrimaryKey	back to summary
public void setPrimaryKey(boolean primaryKey)

setRowId

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public void setRowId(boolean rowId)

Set row identity flag.

Parameters

rowId:boolean: true _ROWID_ column, false otherwise

setSelectivity

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public void setSelectivity(int selectivity)

Set the new selectivity of a column.

Parameters

selectivity:int: the new value

setSequence

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public void setSequence(Sequence sequence, boolean generatedAlways)

Set the sequence to generate the value.

Parameters

sequence:Sequence: the sequence
generatedAlways:boolean: whether the value of the sequence is always used

setTable

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public void setTable(Table table, int columnId)

Set the table and column id.

Parameters

table:Table: the table
columnId:int: the column index

setVisible	back to summary
public void setVisible(boolean b)

toString back to summary

public String toString()

Overrides java.lang.Object.toString.

Doc from java.lang.Object.toString.

Returns a string representation of the object. Satisfying this method's contract implies a non-null result must be returned.

Returns:String

a string representation of the object

Annotations

@Override

updateSequenceIfRequired	back to summary
private void updateSequenceIfRequired(SessionLocal session, long value)

validateConvertUpdateSequence

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pack-priv Value validateConvertUpdateSequence(SessionLocal session, Value value, Row row)

Validate the value, convert it if required, and update the sequence value if required. If the value is null, the default value (NULL if no default is set) is returned. Domain constraints are validated as well.

Parameters

session:SessionLocal: the session
value:Value: the value or null
row:Row: the row

Returns:Value

the new or converted value

writeColumns

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public static StringBuilder writeColumns(StringBuilder builder, Column[] columns, int sqlFlags)

Appends the specified columns to the specified builder.

Parameters

builder:StringBuilder: string builder
columns:Column[]: columns
sqlFlags:int: formatting flags

Returns:StringBuilder

the specified string builder

writeColumns

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public static StringBuilder writeColumns(StringBuilder builder, Column[] columns, String separator, String suffix, int sqlFlags)

Appends the specified columns to the specified builder.

Parameters

builder:StringBuilder: string builder
columns:Column[]: columns
separator:String: separator
suffix:String: additional SQL to append after each column
sqlFlags:int: formatting flags

Returns:StringBuilder

the specified string builder

public final Class Column

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail