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Code Issues Releases Wiki Activity

refactor sql parser.

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This commit is contained in:
wenshao
2017-06-01 09:09:46 +08:00
parent ad452e507d
commit 82d691365a
13 changed files with 163 additions and 138 deletions
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src/main/java/com/alibaba/druid/sql/SQLUtils.java
+55 -2
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@@ -23,8 +23,7 @@ import com.alibaba.druid.DruidRuntimeException;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.SQLObject;
import com.alibaba.druid.sql.ast.SQLStatement;
import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
import com.alibaba.druid.sql.ast.expr.SQLBinaryOperator;
import com.alibaba.druid.sql.ast.expr.*;
import com.alibaba.druid.sql.ast.statement.SQLDeleteStatement;
import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
import com.alibaba.druid.sql.ast.statement.SQLSelectOrderByItem;
@@ -736,5 +735,59 @@ public class SQLUtils {
return buf.hashCode();
}
public static SQLExpr not(SQLExpr expr) {
if (expr instanceof SQLBinaryOpExpr) {
SQLBinaryOpExpr binaryOpExpr = (SQLBinaryOpExpr) expr;
SQLBinaryOperator op = binaryOpExpr.getOperator();
SQLBinaryOperator notOp = null;
switch (op){
case Equality:
notOp = SQLBinaryOperator.LessThanOrEqualOrGreaterThan;
break;
case LessThanOrEqualOrGreaterThan:
notOp = SQLBinaryOperator.Equality;
break;
case LessThan:
notOp = SQLBinaryOperator.GreaterThanOrEqual;
break;
case LessThanOrEqual:
notOp = SQLBinaryOperator.GreaterThan;
break;
case GreaterThan:
notOp = SQLBinaryOperator.LessThanOrEqual;
break;
case GreaterThanOrEqual:
notOp = SQLBinaryOperator.LessThan;
break;
case Is:
notOp = SQLBinaryOperator.IsNot;
break;
case IsNot:
notOp = SQLBinaryOperator.Is;
break;
default:
break;
}
if (notOp != null) {
return new SQLBinaryOpExpr(binaryOpExpr.getLeft(), notOp, binaryOpExpr.getRight());
}
}
if (expr instanceof SQLInListExpr) {
SQLInListExpr inListExpr = (SQLInListExpr) expr;
SQLInListExpr newInListExpr = new SQLInListExpr(inListExpr);
newInListExpr.getTargetList().addAll(inListExpr.getTargetList());
newInListExpr.setNot(!inListExpr.isNot());
return newInListExpr;
}
return new SQLUnaryExpr(SQLUnaryOperator.Not, expr);
}
}