public static boolean visit(MappingVisitor visitor, SQLSelectQueryBlock x) {
if (x.getSelectList().size() == 0) {
fillSelectList(visitor, x);
}
if (x.getSelectList().size() == 1) {
if (x.getSelectList().get(0).getExpr() instanceof SQLAllColumnExpr) {
x.getSelectList().clear();
fillSelectList(visitor, x);
}
}
if (x.getFrom() == null) {
Entity firstEntity = visitor.getFirstEntity();
SQLExprTableSource from =
new SQLExprTableSource(new SQLIdentifierExpr(firstEntity.getName()));
x.setFrom(from);
}
for (SQLSelectItem item : x.getSelectList()) {
item.setParent(x);
}
return true;
}
public boolean visit(SQLSelectQueryBlock x) {
if (x.getFrom() == null) {
return false;
}
setMode(x, Mode.Select);
if (x.getFrom() instanceof SQLSubqueryTableSource) {
x.getFrom().accept(this);
return false;
}
if (x.getInto() != null && x.getInto().getExpr() instanceof SQLName) {
SQLName into = (SQLName) x.getInto().getExpr();
String ident = into.toString();
TableStat stat = getTableStat(ident);
if (stat != null) {
stat.incrementInsertCount();
}
}
String originalTable = getCurrentTable();
if (x.getFrom() instanceof SQLExprTableSource) {
SQLExprTableSource tableSource = (SQLExprTableSource) x.getFrom();
if (tableSource.getExpr() instanceof SQLName) {
String ident = tableSource.getExpr().toString();
setCurrentTable(x, ident);
x.putAttribute(ATTR_TABLE, ident);
if (x.getParent() instanceof SQLSelect) {
x.getParent().putAttribute(ATTR_TABLE, ident);
}
x.putAttribute("_old_local_", originalTable);
}
}
if (x.getFrom() != null) {
x.getFrom().accept(this); // 提前执行，获得aliasMap
String table = (String) x.getFrom().getAttribute(ATTR_TABLE);
if (table != null) {
x.putAttribute(ATTR_TABLE, table);
}
}
// String ident = x.getTable().toString();
//
// TableStat stat = getTableStat(ident);
// stat.incrementInsertCount();
// return false;
if (x.getWhere() != null) {
x.getWhere().setParent(x);
}
return true;
}
public static boolean visit(SQLEvalVisitor visitor, SQLQueryExpr x) {
if (x.getSubQuery().getQuery() instanceof SQLSelectQueryBlock) {
SQLSelectQueryBlock queryBlock = (SQLSelectQueryBlock) x.getSubQuery().getQuery();
boolean nullFrom = false;
if (queryBlock.getFrom() == null) {
nullFrom = true;
} else if (queryBlock.getFrom() instanceof SQLExprTableSource) {
SQLExpr expr = ((SQLExprTableSource) queryBlock.getFrom()).getExpr();
if (expr instanceof SQLIdentifierExpr) {
if ("dual".equalsIgnoreCase(((SQLIdentifierExpr) expr).getName())) {
nullFrom = true;
}
}
}
if (nullFrom) {
List<Object> row = new ArrayList<Object>(queryBlock.getSelectList().size());
for (int i = 0; i < queryBlock.getSelectList().size(); ++i) {
SQLSelectItem item = queryBlock.getSelectList().get(i);
item.getExpr().accept(visitor);
Object cell = item.getExpr().getAttribute(EVAL_VALUE);
row.add(cell);
}
List<List<Object>> rows = new ArrayList<List<Object>>(1);
rows.add(row);
Object result = rows;
queryBlock.putAttribute(EVAL_VALUE, result);
x.getSubQuery().putAttribute(EVAL_VALUE, result);
x.putAttribute(EVAL_VALUE, result);
return false;
}
}
return false;
}
