我有一个PreparedStatement,例如:
PreparedStatement preparedStatement = connect.prepareStatement("INSERT into employee (id, time, name" + "(?,?,?)",Statement.RETURN_GENERATED_KEYS);
ResultSet tableKeys = preparedStatement.getGeneratedKeys();
preparedStatement.executeUpdate();
tableKeys.next();
int autoGeneratedID = tableKeys.getInt(1);
preparedStatement.setInt(1,autoGeneratedID);
preparedStatement.setTimestamp(2, new java.sql.Timestamp(new java.util.Date().getTime()));
preparedStatement.setString(3, "Test");
preparedStatement.executeUpdate();
如您所见,Employee表具有自动递增的ID。我需要基本上使用preparedStatement自动添加它。谁能告诉我哪里出错了并纠正我?现在它只是给了我一个与Statement相关的错误。
答案 0 :(得分:29)
将列完全从INSERT
语句中删除。它将由数据库引擎生成。您的查询应该是:
INSERT INTO employee (time, name)
VALUES (?, ?)
其次,您必须先执行插入,然后从结果中获取密钥。
我相信你的代码应该是:
PreparedStatement preparedStatement =
connect.prepareStatement("INSERT into employee (time, name) VALUES (?,?)",
Statement.RETURN_GENERATED_KEYS);
preparedStatement.setTimestamp(1,
new java.sql.Timestamp(new java.util.Date().getTime()));
preparedStatement.setString(2, "Test");
preparedStatement.executeUpdate();
ResultSet tableKeys = preparedStatement.getGeneratedKeys();
tableKeys.next();
int autoGeneratedID = tableKeys.getInt(1);
注意,此示例不检查已执行语句的成功或返回键的存在。
答案 1 :(得分:0)
try{
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","system","password");
PreparedStatement ps = con.prepareStatement("insert into imgslider(id,cmnt,date1,img,status) values(seq.nextval,?,?,?,?)");
ResultSet rs = null;
String s1 = "I’ve Come and I’m Gone: A Tribute to Istanbul’s Street";
ps.setString(1,s1);
Calendar calendar = Calendar.getInstance();
java.sql.Date dd = new java.sql.Date(calendar.getTime().getTime());
ps.setDate(2,dd);
FileInputStream f1 = new FileInputStream("F:\\java\\slide-9.jpg");
ps.setBinaryStream(3,f1,f1.available());
ps.setInt(4,0);
int i = ps.executeUpdate();
System.out.println(i+" rows affected");
con.close();
}
这是我的PreparedStatement表格中的自动增量列代码。
答案 2 :(得分:0)
您应该对准备好的语句字符串进行一些修改(定义{{1}}语句),
default
该修改是由于发生此问题:Column count doesn't match value count at row 1 JAVA mysql
之后,您的代码如下所示:
"INSERT into employee VALUES(default,?,?)"
感谢Ic.的回答。