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    sql="insert into tab1 values(?,?,?,?,NULL,?,NULL)";

    pst=conn.prepareStatement(sql);
    pst.setString(1,username);
    pst.setString(2,passwd);
    pst.setString(3,nike);
    pst.setString(4,"0");
    pst.setString(5,"0");
    pst.executeUpdate();

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pstÒªÏȹصô
sql="insert into tab1 values(?,?,?,?,NULL,?,NULL)";
pst=conn.prepareStatement(sql);
pst.setString(1,username);
pst.setString(2,passwd);
pst.setString(3,nike);
pst.setString(4,"0");
pst.setString(5,"0");
pst.executeUpdate();
pst.close();
sql="insert into tab2 values(?,?,?,?,NULL,?,NULL)";
pst=conn.prepareStatement(sql);
pst.setString(1,username);
pst.setString(2,passwd);
pst.setString(3,nike);
pst.setString(4,"0");
pst.setString(5,"0");
pst.executeUpdate();
pst.close();

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