java - SQL 语句 SQLSyntaxErrorException

Question

我在执行以下 SQL 语句时遇到错误:

String sql = "CREATE TABLE RESERVATION (";
sql = sql + " UID VARCHAR,";
sql = sql + " ISBN INTEGER,";
sql = sql + " DATEISSUE DATE,";
sql = sql + " DATERETURN DATE,";
sql = sql + " FOREIGN KEY (UID) REFERENCES USERS (UID),";
sql = sql + " FOREIGN KEY (ISBN) REFERENCES BOOKS (ISBN) )";

这是我收到的错误:

java.sql.SQLSyntaxErrorException: Syntax error: Encountered "," at line 1, column 39.

Answer 1

第 39 列接近 varchar 的末尾，因此您可能需要它的大小，例如 varchar(20)。