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当一个SELECT语句并不是以SELECT为开头时(比如在SELECT关键字前后有换行符)无法通过参数检查.
https://github.com/drinkjava2/jDialects/blob/master/jdialects/src/main/java/com/github/drinkjava2/jdialects/Dialect.java#L267

重现步骤

1. 在mysql数据库中创建表

create table test
(
    nc char(100) charset utf8 null,
    nvc varchar(100) charset utf8 null,
    c char(100) null,
    vc varchar(100) null,
    i int(10) null,
    bi bigint null,
    si smallint null,
    ti tinyint null
)

2. 执行如下代码

    Dialect dialect = Dialect.MySQL8Dialect;
    // 获取连接
    Connection connection = getConnection();
    TableModel[] tableModels = TableModelUtils.db2Models(connection, dialect);
    TableModel tableModel = tableModels[0];
    String[] ddl = dialect .toCreateDDL(tableModel);
    System.out.println(ddl[0]);

输出如下:

create table test
( 
nc char(300),
nvc varchar(300),
c char(400),
vc varchar(400),
i integer,
bi bigint(0),
si smallint(0),
ti tinyint(0)
) engine=InnoDB;

可以看到字段的长度被放大了

原因

解析字段的时候使用了CHAR_OCTET_LENGTH作为columnLength,生成ddl的时候也是用的这个,但是实际上mysql很多字段使用的都是COLUMN_SIZE

db ddl have cascade feature，would you like to support it？you can check it from ddlutils docs or mysql grammer

Some db version like MySQL5Dialect，MySQL55Dialect，MySQL57Dialect and MySQL8Dialect.
If I use MySQL56, which dialect should i choose? Does it backward compatible as I use MySQL57Dialect?

TableModel tb = new TableModel("test");
String[] add = Dialect.PostgreSQLDialect.toAddColumnDDL(tb.column("name").STRING(50).comment("名称"));

version: 5.0.13.jre8

a table can have a unique constraint with more than 1 column . but it will output unique constraint for each column. it should output one constraint with all column which have same constraint name. and a column can be used by 2 unique constraint too.