org.apache.openjpa.jdbc.schema
Class Column

java.lang.Object
  org.apache.openjpa.jdbc.schema.Column

All Implemented Interfaces:

Serializable

public class Column
extends Object

Represents a database column. Closely aligned with the column information available from DatabaseMetaData.

Author:

Abe White, Stephen Kim

See Also:

Serialized Form

Field Summary

static int	FLAG_DIRECT_INSERT
static int	FLAG_DIRECT_UPDATE
static int	FLAG_FK_INSERT
static int	FLAG_FK_UPDATE
static int	FLAG_PK_JOIN
static int	FLAG_UNINSERTABLE
static int	FLAG_UNUPDATABLE

Constructor Summary

Column()
Default constructor.

Column(String name, Table table)
Constructor.

Method Summary

void	copy(Column from) Copy information from the given column to this one.
void	deref()
boolean	equalsColumn(Column col) Tests compatibility.
int	getDecimalDigits() Return the number of decimal digits for the column, if applicable.
Object	getDefault() Return the default value set for this column, if any.
String	getDefaultString() Return the default value set for the column, if any.
String	getDescription() Useful for debugging.
boolean	getFlag(int flag) Flags are used for bookkeeping information.
String	getFullName() Return the column's full name, in the form <table>.<name>.
int	getIndex() Return the column's 0-based index in the owning table.
int	getJavaType() The Java type the data in this column is treated as, from JavaTypes or JavaSQLTypes.
String	getName() Return the column's name.
int	getRefCount()
String	getSchemaName() The column's schema name.
int	getSize() Return the column's size.
Table	getTable() Return the table for the column.
String	getTableName() The column's table name.
String	getTarget() The name of the column this column joins to, if any.
String	getTargetField() The name of the field this column joins to, if any.
int	getType() Return the column's SQL type.
String	getTypeName() The database-specific SQL type of this column.
boolean	isAutoAssigned() Whether this column is auto-assigned a value on insert.
boolean	isCompatible(int type, String typeName, int size, int decimals) Return true if this column is compatible with the given JDBC type from Types and size.
boolean	isLob() Whether this column is a LOB.
boolean	isNotNull() Return true if this is a NOT NULL column.
boolean	isNotNullExplicit() Whether the not-null property has been set.
boolean	isPrimaryKey() Return true if this column belongs to the table's primary key.
boolean	isRelationId() Whether this column stores some form of serialized identity value for a related record.
void	ref()
void	setAutoAssigned(boolean autoAssign) Whether this column is auto-incrementing.
void	setDecimalDigits(int digits) Set the number of decimal digits for the column.
void	setDefault(Object def) Set the default value for the column.
void	setDefaultString(String def) Set the default value for the column.
void	setFlag(int flag, boolean on) Flags are used for bookkeeping information.
void	setJavaType(int type) The Java type the data in this column is treated as, from JavaTypes or JavaSQLTypes.
void	setName(String name) Set the column's name.
void	setNotNull(boolean notNull) Set whether this is a NOT NULL column.
void	setRelationId(boolean rel) Whether this column stores some form of serialized identity value for a related record.
void	setSchemaName(String name) The column's schema name.
void	setSize(int size) Set the column's size.
void	setTableName(String name) The column's table name.
void	setTarget(String target) The name of the column this column joins to, if any.
void	setTargetField(String target) The name of the field this column joins to, if any.
void	setType(int sqlType) Set the column's SQL type.
void	setTypeName(String typeName) The database-specific SQL type of this column.
String	toString() Returns the column name.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

FLAG_UNINSERTABLE

public static final int FLAG_UNINSERTABLE

See Also:

Constant Field Values

FLAG_UNUPDATABLE

public static final int FLAG_UNUPDATABLE

See Also:

Constant Field Values

FLAG_DIRECT_INSERT

public static final int FLAG_DIRECT_INSERT

See Also:

Constant Field Values

FLAG_DIRECT_UPDATE

public static final int FLAG_DIRECT_UPDATE

See Also:

Constant Field Values

FLAG_FK_INSERT

public static final int FLAG_FK_INSERT

See Also:

Constant Field Values

FLAG_FK_UPDATE

public static final int FLAG_FK_UPDATE

See Also:

Constant Field Values

FLAG_PK_JOIN

public static final int FLAG_PK_JOIN

See Also:

Constant Field Values

Constructor Detail

Column

public Column()

Default constructor.

Column

public Column(String name,
              Table table)

Constructor.

Parameters:

name - the name of the column

table - the column's table

Method Detail

getTable

public Table getTable()

Return the table for the column.

getTableName

public String getTableName()

The column's table name.

setTableName

public void setTableName(String name)

The column's table name. You can only call this method on columns whose table object is not set.

getSchemaName

public String getSchemaName()

The column's schema name.

setSchemaName

public void setSchemaName(String name)

The column's schema name. You can only call this method on columns whose table object is not set.

getName

public String getName()

Return the column's name.

setName

public void setName(String name)

Set the column's name. You can only call this method on columns whose table object is not set.

getFullName

public String getFullName()

Return the column's full name, in the form <table>.<name>.

getType

public int getType()

Return the column's SQL type. This will be one of the type constants defined in Types.

setType

public void setType(int sqlType)

Set the column's SQL type. This should be one of the type constants defined in Types.

getTypeName

public String getTypeName()

The database-specific SQL type of this column.

setTypeName

public void setTypeName(String typeName)

The database-specific SQL type of this column.

getJavaType

public int getJavaType()

The Java type the data in this column is treated as, from JavaTypes or JavaSQLTypes.

setJavaType

public void setJavaType(int type)

The Java type the data in this column is treated as, from JavaTypes or JavaSQLTypes.

getSize

public int getSize()

Return the column's size.

setSize

public void setSize(int size)

Set the column's size.

getDecimalDigits

public int getDecimalDigits()

Return the number of decimal digits for the column, if applicable.

setDecimalDigits

public void setDecimalDigits(int digits)

Set the number of decimal digits for the column.

getDefaultString

public String getDefaultString()

Return the default value set for the column, if any.

setDefaultString

public void setDefaultString(String def)

Set the default value for the column.

getDefault

public Object getDefault()

Return the default value set for this column, if any. If only a default string has been set, attempts to convert it to the right type based on the Java type set for this column.

setDefault

public void setDefault(Object def)

Set the default value for the column.

isNotNull

public boolean isNotNull()

Return true if this is a NOT NULL column.

setNotNull

public void setNotNull(boolean notNull)

Set whether this is a NOT NULL column.

isNotNullExplicit

public boolean isNotNullExplicit()

Whether the not-null property has been set.

isAutoAssigned

public boolean isAutoAssigned()

Whether this column is auto-assigned a value on insert.

setAutoAssigned

public void setAutoAssigned(boolean autoAssign)

Whether this column is auto-incrementing.

isRelationId

public boolean isRelationId()

Whether this column stores some form of serialized identity value for a related record. This makes the column dependent on the knowing the final identity of the relation before the column value is set.

setRelationId

public void setRelationId(boolean rel)

Whether this column stores some form of serialized identity value for a related record. This makes the column dependent on the knowing the final identity of the relation before the column value is set.

getTarget

public String getTarget()

The name of the column this column joins to, if any. Used for mapping.

setTarget

public void setTarget(String target)

The name of the column this column joins to, if any. Used for mapping.

getTargetField

public String getTargetField()

The name of the field this column joins to, if any. Used for mapping.

setTargetField

public void setTargetField(String target)

The name of the field this column joins to, if any. Used for mapping.

getFlag

public boolean getFlag(int flag)

Flags are used for bookkeeping information. They are ignored at runtime.

setFlag

public void setFlag(int flag,
                    boolean on)

Flags are used for bookkeeping information. They are ignored at runtime.

isPrimaryKey

public boolean isPrimaryKey()

Return true if this column belongs to the table's primary key.

getIndex

public int getIndex()

Return the column's 0-based index in the owning table.

isLob

public boolean isLob()

Whether this column is a LOB.

isCompatible

public boolean isCompatible(int type,
                            String typeName,
                            int size,
                            int decimals)

Return true if this column is compatible with the given JDBC type from Types and size.

toString

public String toString()

Returns the column name.

Overrides:

toString in class Object

getDescription

public String getDescription()

Useful for debugging.

equalsColumn

public boolean equalsColumn(Column col)

Tests compatibility.

copy

public void copy(Column from)

Copy information from the given column to this one.

getRefCount

public int getRefCount()

ref

public void ref()

deref

public void deref()