druid sqlparser使用例子

最新推荐文章于 2025-08-05 18:36:23 发布

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最新推荐文章于 2025-08-05 18:36:23 发布

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文章标签：数据库 java

原文链接：http://www.cnblogs.com/youge-OneSQL/p/6371503.html

本文介绍了一个使用 Alibaba Druid 进行 MySQL DELETE 语句解析的单元测试案例。测试涉及复杂的 DELETE 语句，包括多表连接及条件过滤等特性。通过解析 SQL 语句，提取出涉及的表名、字段以及条件表达式等内容。

package com.alibaba.druid.bvt.sql.mysql;

import java.util.List;

import org.junit.Assert;

import com.alibaba.druid.sql.MysqlTest;
import com.alibaba.druid.sql.ast.SQLStatement;
import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlSchemaStatVisitor;
import com.alibaba.druid.stat.TableStat;
import com.alibaba.druid.stat.TableStat.Column;

public class MySqlDeleteTest_0 extends MysqlTest {

public void test_0() throws Exception {
String sql = "DELETE a1, a2 FROM t1 AS a1 INNER JOIN t2 AS a2 WHERE a1.id=a2.id;";

MySqlStatementParser parser = new MySqlStatementParser(sql);
List<SQLStatement> statementList = parser.parseStatementList();
SQLStatement statemen = statementList.get(0);
// print(statementList);

Assert.assertEquals(1, statementList.size());

MySqlSchemaStatVisitor visitor = new MySqlSchemaStatVisitor();
statemen.accept(visitor);

// System.out.println("Tables : " + visitor.getTables());
// System.out.println("fields : " + visitor.getColumns());
// System.out.println("coditions : " + visitor.getConditions());
// System.out.println("orderBy : " + visitor.getOrderByColumns());

Assert.assertEquals(2, visitor.getTables().size());
Assert.assertEquals(2, visitor.getColumns().size());
Assert.assertEquals(2, visitor.getConditions().size());

Assert.assertTrue(visitor.getTables().containsKey(new TableStat.Name("t1")));
Assert.assertTrue(visitor.getTables().containsKey(new TableStat.Name("t2")));

Assert.assertTrue(visitor.getColumns().contains(new Column("t1", "id")));
Assert.assertTrue(visitor.getColumns().contains(new Column("t2", "id")));
}
}

转载于:https://www.cnblogs.com/youge-OneSQL/p/6371503.html