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Java Source Code / Java Documentation » Database ORM » SimpleORM » simpleorm.core

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

simpleorm.properties .SPropertyMap

simpleorm.core .SFieldMeta

All known Subclasses:   simpleorm.core .SFieldScalar,  simpleorm.core .SFieldReference,
SFieldMeta
abstract public class SFieldMeta extends SPropertyMap implements Serializable(Code)
Each instance defines the meta data for a field in an SRecordMeta . Subclasses are used for specific data types, with SFieldObject being the most generic. Like JDBC, type conversions are made automatically.
Internally, the types are stored accurately. Ie. the SRecordInstance.fieldValues objects are the exact types as declared (String, Integer, Employee etc.) However, generous automatic conversions are performed both when accessing these from the application and when getting and setting columns in the database.
See SSimpleORMProperties for a descripiton of how properties are used with fields.

Field Summary
int fieldIndex
     The indext into SRecordMeta.fields.
transient boolean isPrimaryKey
     Is part of a primary key, may also be a foreign key.
transient boolean isReadOnly
     Can only be read, not set.
transient SFieldMeta referencedKeyField
     If sFieldRefrence != null, then this refers to the corresponding key field in the referenced table.
transient SFieldReference sFieldReference
     Not null means this field is a foreign key member of the SFieldReference.
SRecordMeta sRecordMeta
     The record that this field belongs to.

Constructor Summary
SFieldMeta(SRecordMeta sRecord, String columnName, String fieldName, SPropertyValue[] pvalues)
     Creates a new field for sRecord corresponding to columnName.
SFieldMeta(SRecordMeta sRecord, String columnName, SPropertyValue[] pvalues)
     Common case for all fields but References.

Method Summary
void checkUpdatable(SRecordInstance instance)
     Specialized for SReferences.
abstract Object convertToField(Object raw)
     Converts the parameter from the users type to the correct internal Object type for this field.
abstract String defaultDataType()
     Return default SDATA_TYPE property.
Object getFieldValue(SRecordInstance instance, long sqy_flags)
     Dispatched from SRecordInstance.getObject(), this is specialized for references etc.
Object getRawFieldValue(SRecordInstance instance, long sqy_flags)

public SRecordMeta getSRecordMeta()

abstract SFieldMeta makeForeignKey(SRecordMeta rmeta, String prefix, SPropertyValue[] pvals)
     Clone this key field to be a foreign key to rmeta of the same type.
synchronized long nextGeneratedValue(long minimum)
     This is used to fudge version numbers in databases that do not properly suport them.
abstract Object queryFieldValue(ResultSet rs, int sqlIndex)
     Issues a JDBC get*() on the result set for the field and converts the database type to the appropriate internal type, eg, Double for a double field.
void rawSetFieldValue(SRecordInstance instance, Object value)
     Specialized for References.
protected Object readResolve()
     Same purpose as corresponding method on SRecordMeta.
void setFieldValue(SRecordInstance instance, Object rawValue)
     Does generic checks before calling field type specific handler. See SRecordInstance.setObject for a description fo the full flow.
The internal flow is:-
Note that setRawFieldValue is also called directly for keys etc.

toLongerString
public String toLongerString()(Code)
Lists all the details of the field.

toString
public String toString()(Code)
Lists the record and column name only. Useful in traces.

writeFieldValue
void writeFieldValue(PreparedStatement ps, int sqlIndex, Object value)(Code)
Places a value in a prepared statement in the database representation used during SRecordInstance.flush. Can convert between internal values and database values, eg. TRUE to "Y". (This does NOT need to handle NULL values (those are handled seperately by SRecordInstance))

writeFieldValue
Object writeFieldValue(Object value)(Code)
Converts a single value from internal representation to database representation. Used primarily by the writeFieldValue above, but also used for converting optimistic lock values in SRecordInstance.flush.
Overidden by SFieldBoolean. (not by SFieldString). NOTE: This does NOT need to handle NULL values (those are handled seperately by SRecordInstance)

Methods inherited from simpleorm.properties.SPropertyMap
public boolean getBoolean(SProperty prop)(Code)(Java Doc)
public Object getProperty(SProperty prop)(Code)(Java Doc)
public String getString(SProperty prop)(Code)(Java Doc)
public Object putDefaultProperty(SProperty prop, Object value)(Code)(Java Doc)
public void putProperty(SProperty prop, Object value)(Code)(Java Doc)
public void remove(SProperty prop)(Code)(Java Doc)
public void setPropertyValue(SPropertyValue pval)(Code)(Java Doc)
public void setPropertyValues(SPropertyValue[] pvals)(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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