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Code Issues Releases Wiki Activity

enhance SchemaStatVisitor

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This commit is contained in:
温少
2012-02-23 20:22:11 +08:00
parent 94c5f6e420
commit 2d5c963201
6 changed files with 167 additions and 8 deletions
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src/main/java/com/alibaba/druid/sql/visitor/SchemaStatVisitor.java
+98 -7
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@@ -6,11 +6,14 @@ import java.util.List;
import java.util.Map;
import java.util.Set;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.SQLName;
import com.alibaba.druid.sql.ast.SQLObject;
import com.alibaba.druid.sql.ast.expr.SQLAggregateExpr;
import com.alibaba.druid.sql.ast.expr.SQLAllColumnExpr;
import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
import com.alibaba.druid.sql.ast.expr.SQLInListExpr;
import com.alibaba.druid.sql.ast.expr.SQLInSubQueryExpr;
import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
@@ -27,17 +30,90 @@ import com.alibaba.druid.sql.ast.statement.SQLTruncateStatement;
import com.alibaba.druid.sql.ast.statement.SQLUpdateStatement;
import com.alibaba.druid.stat.TableStat;
import com.alibaba.druid.stat.TableStat.Column;
import com.alibaba.druid.stat.TableStat.Condition;
import com.alibaba.druid.stat.TableStat.Mode;
public class SchemaStatVisitor extends SQLASTVisitorAdapter {
protected HashMap<TableStat.Name, TableStat> tableStats = new HashMap<TableStat.Name, TableStat>();
protected Set<Column> fields = new HashSet<Column>();
protected final HashMap<TableStat.Name, TableStat> tableStats = new HashMap<TableStat.Name, TableStat>();
protected final Set<Column> fields = new HashSet<Column>();
protected final Set<Condition> conditions = new HashSet<Condition>();
protected final static ThreadLocal<Map<String, String>> aliasLocal = new ThreadLocal<Map<String, String>>();
protected final static ThreadLocal<String> currentTableLocal = new ThreadLocal<String>();
protected final static ThreadLocal<Mode> modeLocal = new ThreadLocal<Mode>();
public Set<Condition> getConditions() {
return conditions;
}
public boolean visit(SQLBinaryOpExpr x) {
switch (x.getOperator()) {
case Equality:
case NotEqual:
case GreaterThan:
case GreaterThanOrEqual:
case LessThan:
case LessThanOrEqual:
case LessThanOrEqualOrGreaterThan:
case Like:
case NotLike:
case Is:
case IsNot:
handleCondition(x.getLeft(), x.getOperator().name);
handleCondition(x.getRight(), x.getOperator().name);
break;
default:
break;
}
return true;
}
protected void handleCondition(SQLExpr expr, String operator) {
Map<String, String> aliasMap = aliasLocal.get();
if (aliasMap == null) {
return;
}
if (expr instanceof SQLPropertyExpr) {
SQLExpr owner = ((SQLPropertyExpr) expr).getOwner();
String column = ((SQLPropertyExpr) expr).getName();
if (owner instanceof SQLIdentifierExpr) {
String table = ((SQLIdentifierExpr) owner).getName();
if (aliasMap.containsKey(table)) {
table = aliasMap.get(table);
}
if (table != null) {
Condition condition = new Condition();
condition.setColumn(new Column(table, column));
condition.setOperator(operator);
this.conditions.add(condition);
}
}
return;
}
if (expr instanceof SQLIdentifierExpr) {
String column = ((SQLIdentifierExpr) expr).getName();
String table = currentTableLocal.get();
if (table != null) {
if (aliasMap.containsKey(table)) {
table = aliasMap.get(table);
}
}
if (table != null) {
Condition condition = new Condition();
condition.setColumn(new Column(table, column));
condition.setOperator(operator);
this.conditions.add(condition);
}
}
}
@Override
public boolean visit(SQLTruncateStatement x) {
x.putAttribute("_original_use_mode", modeLocal.get());
@@ -67,7 +143,7 @@ public class SchemaStatVisitor extends SQLASTVisitorAdapter {
return false;
}
@Override
public boolean visit(SQLDropTableStatement x) {
x.putAttribute("_original_use_mode", modeLocal.get());
@@ -162,7 +238,7 @@ public class SchemaStatVisitor extends SQLASTVisitorAdapter {
SQLExprTableSource tableSource = (SQLExprTableSource) x.getFrom();
if (tableSource.getExpr() instanceof SQLName) {
String ident = tableSource.getExpr().toString();
Map<String, String> aliasMap = aliasLocal.get();
if (aliasMap.containsKey(ident) && aliasMap.get(ident) == null) {
currentTableLocal.set(null);
@@ -266,13 +342,13 @@ public class SchemaStatVisitor extends SQLASTVisitorAdapter {
public boolean visit(SQLExprTableSource x) {
if (isSimpleExprTableSource(x)) {
String ident = x.getExpr().toString();
Map<String, String> aliasMap = aliasLocal.get();
if (aliasMap.containsKey(ident) && aliasMap.get(ident) == null) {
return false;
}
TableStat stat = tableStats.get(ident);
if (stat == null) {
stat = new TableStat();
@@ -378,8 +454,23 @@ public class SchemaStatVisitor extends SQLASTVisitorAdapter {
return false;
}
public boolean visit(SQLInListExpr x) {
if (x.isNot()) {
handleCondition(x.getExpr(), "NOT IN");
} else {
handleCondition(x.getExpr(), "IN");
}
return true;
}
@Override
public boolean visit(SQLInSubQueryExpr x) {
if (x.isNot()) {
handleCondition(x.getExpr(), "NOT IN");
} else {
handleCondition(x.getExpr(), "IN");
}
return true;
}