[英]insert query with varchar as data type for primary key
该程序不接受下面给出的查询-
public class loginDaos {
public void create(loginBean bean) {
ConnectionPool c = ConnectionPool.getInstance();
c.initialize();
Connection con = c.getConnection();
try {
String sql = "INSERT INTO login VALUES(?,?,?,?)";
PreparedStatement pstmt = con.prepareStatement(sql);
pstmt.setString(1, bean.getCode());
pstmt.setString(2, bean.getUserid());
pstmt.setString(3, bean.getPassword());
pstmt.setString(4, bean.getPosition());
pstmt.executeUpdate(sql);
}
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String args[]) {
loginDaos ld = new loginDaos();
loginBean lb = new loginBean("representative", "rep7", "rep7", "r");
ld.create(lb);
}
}
该表是:
CREATE TABLE login
( userid char(25);
password varchar(45),
code char(5),
position char(),
PRIMARY KEY (code)
);
我目前将userid,password,代码和position的值保留为String。堆栈跟踪为:
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '?,?,?,?)' at line 1
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
at com.mysql.jdbc.Util.getInstance(Util.java:381)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1030)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3491)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3423)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1936)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2060)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2536)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1564)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1485)
at login.loginDaos.create(loginDaos.java:33)
at login.loginDaos.main(loginDaos.java:42)
建立成功(总时间:0秒)
救命!
使用PreparedStatement
,应使用不带String
参数的executeQuery()
, executeUpdate()
或execute()
方法。
因此,要解决此问题,请使用:
// ....
pstmt.setString(3, bean.getPassword());
pstmt.setString(4, bean.getPosition());
pstmt.executeUpdate();
MySQL驱动程序实现存在一个错误,因为JDBC规范指出,在PreparedStatement
或CallableStatement
实现上CallableStatement
时,接受字符串的方法应引发SQLException
。 在这种情况下,它仅引发异常,因为它尝试直接执行参数化查询。
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