/*
* Copyright 1999-2011 Alibaba Group Holding Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.alibaba.druid.sql.oracle.demo;
import java.util.ArrayList;
import java.util.List;
import junit.framework.TestCase;
import com.alibaba.druid.sql.SQLUtils;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.SQLStatement;
import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
import com.alibaba.druid.sql.ast.expr.SQLVariantRefExpr;
import com.alibaba.druid.sql.ast.statement.SQLExprTableSource;
import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleSelectTableReference;
import com.alibaba.druid.sql.dialect.oracle.parser.OracleStatementParser;
import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitorAdapter;
import com.alibaba.druid.sql.parser.SQLStatementParser;
public class Demo1 extends TestCase {
public void test_0() throws Exception {
String sql = "select * from user where uid = ? and uname = ?";
List<Object> parameters = new ArrayList<Object>();
parameters.add(1);
parameters.add("wenshao");
SQLStatementParser parser = new OracleStatementParser(sql);
List<SQLStatement> stmtList = parser.parseStatementList(); //
SQLStatement first = (SQLStatement) stmtList.get(0);
GetVariantVisitor variantVisitor = new GetVariantVisitor();
first.accept(variantVisitor);
SQLVariantRefExpr firstVar = variantVisitor.getVariantList().get(0);
int varIndex = (Integer) firstVar.getAttribute("varIndex");
Integer param = (Integer) parameters.get(varIndex);
String tableName;
if (param.intValue() == 1) {
tableName = "user_1";
} else {
tableName = "user_x";
}
MyOracleVisitor visitor = new MyOracleVisitor(tableName);
first.accept(visitor);
String realSql = SQLUtils.toOracleString(first);
System.out.println(realSql);
}
private static class GetVariantVisitor extends OracleASTVisitorAdapter {
private int varIndex = 0;
private List<SQLVariantRefExpr> variantList = new ArrayList<SQLVariantRefExpr>();
public boolean visit(SQLVariantRefExpr x) {
x.getAttributes().put("varIndex", varIndex++);
return true;
}
public boolean visit(SQLBinaryOpExpr x) {
if (x.getLeft() instanceof SQLIdentifierExpr && x.getRight() instanceof SQLVariantRefExpr) {
SQLIdentifierExpr identExpr = (SQLIdentifierExpr) x.getLeft();
String ident = identExpr.getName();
if (ident.equals("uid")) {
variantList.add((SQLVariantRefExpr) x.getRight());
}
}
return true;
}
public int getVarIndex() {
return varIndex;
}
public void setVarIndex(int varIndex) {
this.varIndex = varIndex;
}
public List<SQLVariantRefExpr> getVariantList() {
return variantList;
}
public void setVariantList(List<SQLVariantRefExpr> variantList) {
this.variantList = variantList;
}
}
private static class MyOracleVisitor extends OracleASTVisitorAdapter {
private String tableName;
public MyOracleVisitor(String tableName){
this.tableName = tableName;
}
public boolean visit(OracleSelectTableReference x) {
SQLExpr expr = x.getExpr();
if (expr instanceof SQLIdentifierExpr) {
SQLIdentifierExpr identExpr = (SQLIdentifierExpr) expr;
String tableName = identExpr.getName();
if (tableName.equals("user")) {
identExpr.setName(this.tableName);
}
} else if (expr instanceof SQLPropertyExpr) {
SQLPropertyExpr proExpr = (SQLPropertyExpr) expr;
String tableName = proExpr.getName();
if (tableName.equals("user")) {
proExpr.setName(this.tableName);
}
}
return true;
}
public boolean visit(SQLExprTableSource x) {
SQLExpr expr = x.getExpr();
if (expr instanceof SQLIdentifierExpr) {
SQLIdentifierExpr identExpr = (SQLIdentifierExpr) expr;
String tableName = identExpr.getName();
if (tableName.equals("user")) {
identExpr.setName(this.tableName);
}
} else if (expr instanceof SQLPropertyExpr) {
SQLPropertyExpr proExpr = (SQLPropertyExpr) expr;
String tableName = proExpr.getName();
if (tableName.equals("user")) {
proExpr.setName(this.tableName);
}
}
return true;
}
}
}