H2数据库投诉有关带有有效mysql查询的sql语法错误

Question

我创建了一个内存H2数据库（ http://www.h2database.com/html/features.html ），如下所示

public static HikariConfig createHikariConfigH2(String schema, String pathToSchemaSql) {
    LOGGER.info("Creating schema {} and execute sql {}", schema, pathToSchemaSql);
    HikariConfig config = new HikariConfig();

    config.setJdbcUrl("jdbc:h2:mem:" + schema + ";"

            + "MODE=MySQL;DATABASE_TO_LOWER=TRUE;CASE_INSENSITIVE_IDENTIFIERS=TRUE"

            + ";DB_CLOSE_DELAY=-1" + ";INIT= drop schema if exists " + schema + " CASCADE\\;create schema " + schema
            + "\\;SET SCHEMA " + schema + "\\;"

            + "runscript from 'classpath:/" + pathToSchemaSql + "'");
    config.setUsername("sa");
    config.setPassword("");
    return config;
}

然后，我尝试如下运行SQL查询

HikariConfig config = createHikariConfigH2(“schema”, “a.sql”);
        try (HikariDataSource master = new HikariDataSource(config);
                Connection conn = master.getConnection();
                PreparedStatement stmt = conn.prepareStatement(
                        "DELETE mt FROM tableA AS mt,tableB AS et WHERE mt.id = et.id AND et._iud = 'D'")) {
            try (ResultSet result = stmt.executeQuery()) {
                List<String> tables = new ArrayList<>();
                while (result.next()) {
                    String tableName = result.getString(1);
                    tables.add(tableName);
                }
            }
        }

但是它抱怨语法错误，但是相同的查询在正常的mysql db上运行良好 。

org.h2.jdbc.JdbcSQLSyntaxErrorException: Syntax error in SQL statement "delete mt from tableA as mt,[*]tableB as et where mt.id = et.id and et._iud = 'D' "; SQL statement:
DELETE mt FROM tableA AS mt,tableB AS et WHERE mt.id = et.id AND et._iud = 'D' [42000-199]
    at org.h2.message.DbException.getJdbcSQLException(DbException.java:451)
    at org.h2.message.DbException.getJdbcSQLException(DbException.java:427)
    at org.h2.message.DbException.get(DbException.java:205)
    at org.h2.message.DbException.get(DbException.java:181)
    at org.h2.message.DbException.getSyntaxError(DbException.java:229)
    at org.h2.command.Parser.getSyntaxError(Parser.java:989)
    at org.h2.command.Parser.prepareCommand(Parser.java:686)
    at org.h2.engine.Session.prepareLocal(Session.java:627)

在mysql兼容性部分（ http://www.h2database.com/html/features.html#compatibility ）中，我找不到与此相关的任何内容。

有人可以帮忙吗

Answer 1

看来H2不支持从多个表中删除的语法，而MySQL支持。 看看这个答案 ， 该答案显示了如何使用DELETE的子查询来执行此操作。 应该是这样的：

DELETE FROM tableA 
WHERE id IN (
    SELECT id 
    FROM tableB 
    WHERE _iud = 'D'
)