public void SaveChanges(Entity entity) throws Exception {
// do we need to do anything?
if (entity.getIsNew()) this.Insert(entity);
else if (entity.getIsModified()) this.Update(entity);
else if (entity.getIsDeleted()) this.Delete(entity);
// nothing to do...
}
private SqlStatement GetInsertStatement(Entity entity) throws Exception {
StringBuffer builder = new StringBuffer();
SqlStatement sql = new SqlStatement();
// et...
EntityType et = getEntityType();
// create...
builder.append("INSERT INTO ");
builder.append(et.getNativeName());
builder.append(" (");
boolean first = true;
for (int index = 0; index < et.getFields().size(); index++) {
EntityField field = (EntityField) et.getFields().elementAt(index);
if (entity.getIsModified(field)) {
if (first) first = false;
else builder.append(", ");
builder.append(field.getNativeName());
}
}
builder.append(") VALUES (");
first = true;
for (int index = 0; index < et.getFields().size(); index++) {
EntityField field = (EntityField) et.getFields().elementAt(index);
if (entity.getIsModified(field)) {
if (first) first = false;
else builder.append(", ");
builder.append("?");
// add in the parameter....
sql.AddParameterValue(entity.GetValue(field));
}
}
builder.append(")");
// return...
sql.setCommandText(builder.toString());
return sql;
}
private SqlStatement GetUpdateStatement(Entity entity) throws Exception {
StringBuffer builder = new StringBuffer();
SqlStatement sql = new SqlStatement();
// et...
EntityType et = getEntityType();
// update...
builder.append("UPDATE ");
builder.append(et.getNativeName());
builder.append(" SET ");
// walk...
boolean first = true;
EntityField key = null;
for (int index = 0; index < et.getFields().size(); index++) {
EntityField field = (EntityField) et.getFields().elementAt(index);
if (field.getIsKey()) key = field;
else if (entity.getIsModified(field)) {
if (first) first = false;
else builder.append(", ");
// add the snippet...
builder.append(field.getNativeName());
builder.append("=?");
// add the parameter...
Object value = entity.GetValue(field);
sql.AddParameterValue(value);
}
}
// append...
AppendIdConstraint(builder, sql, key, entity);
// return...
sql.setCommandText(builder.toString());
return sql;
}