antville/helma
antville/helma
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added comments to fields, added extendsMapping

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for dbmapping inheritance
This commit is contained in:
hns 2001-07-18 13:14:34 +00:00
parent c28f67f5dc
commit 9952f9b161
1 changed files with 28 additions and 4 deletions
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32
src/helma/objectmodel/DbMapping.java
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@ -20,12 +20,17 @@ import com.workingdogs.village.*;
public class DbMapping implements Updatable { public class DbMapping implements Updatable {
// DbMappings belong to an application
Application app; Application app;
// prototype name of this mapping
String typename; String typename;
// properties from where the mapping is read
SystemProperties props; SystemProperties props;
// name of data source to which this mapping writes
DbSource source; DbSource source;
// name of db table
String table; String table;
ParentInfo[] parent; // list of properties to try for parent ParentInfo[] parent; // list of properties to try for parent
@ -40,22 +45,35 @@ public class DbMapping implements Updatable {
// Map of db columns to Relations objects // Map of db columns to Relations objects
public Hashtable db2prop; public Hashtable db2prop;
// db field used as primary key
String idField; String idField;
// db field used as object name
String nameField; String nameField;
// name of parent prototype, if any
String extendsProto; String extendsProto;
// dbmapping of parent prototype, if any
DbMapping extendsMapping;
// descriptor for key generation method // descriptor for key generation method
private String idgen; private String idgen;
// remember last key generated for this table // remember last key generated for this table
public long lastID; public long lastID;
// the (village) schema of the database table
Schema schema = null; Schema schema = null;
// the (village) keydef of the db table
KeyDef keydef = null; KeyDef keydef = null;
// timestamp of last modification of the mapping (type.properties)
private long lastTypeChange; private long lastTypeChange;
// timestamp of last modification of an object of this type
public long lastDataChange; public long lastDataChange;
/**
* Create an empty DbMapping
*/
public DbMapping () { public DbMapping () {
prop2db = new Hashtable (); prop2db = new Hashtable ();
@ -67,6 +85,9 @@ public class DbMapping implements Updatable {
idField = "id"; idField = "id";
} }
/**
* Create a DbMapping from a type.properties property file
*/
public DbMapping (Application app, String typename, SystemProperties props) { public DbMapping (Application app, String typename, SystemProperties props) {
this.app = app; this.app = app;
@ -101,9 +122,12 @@ public class DbMapping implements Updatable {
*/ */
public synchronized void update () { public synchronized void update () {
this.table = props.getProperty ("_tablename"); table = props.getProperty ("_tablename");
this.idgen = props.getProperty ("_idgen"); idgen = props.getProperty ("_idgen");
this.extendsProto = props.getProperty ("_extends"); // see if this prototype extends (inherits from) any other prototype
extendsProto = props.getProperty ("_extends");
if (extendsProto != null)
extendsMapping = app.getDbMapping (extendsProto);
String sourceName = props.getProperty ("_datasource"); String sourceName = props.getProperty ("_datasource");
if (sourceName != null) { if (sourceName != null) {