使用JDBC向Kudu表插入中文字符-cast的秘密

 staticString JDBC_DRIVER ="com.cloudera.impala.jdbc41.Driver";
static String CONNECTION_URL ="jdbc:impala://ip-172-31-10-118:21050/default";

public static void main(String[] args) {
    Connection con = null;
 ResultSetrs = null;
 PreparedStatementps = null;

    try {
        Class.forName(JDBC_DRIVER);
 con =DriverManager.getConnection(CONNECTION_URL);

 Stringsql2 = "insert into my_first_table values(?, ?)";
 ps =con.prepareStatement(sql2);
 ps.setInt(1,81);
 ps.setString(2,"测试中文字符");
 ps.execute();
 ps.close();

 ps =con.prepareStatement("select * from my_first_table order byid asc");
 rs = ps.executeQuery();
        while (rs.next()){
            System.out.println(rs.getLong(1)+ "\t" +rs.getString(2));
 }

    } catch (Exceptione) {
        e.printStackTrace();
 } finally{
 try {// 关闭rs、ps和con
 rs.close();
 ps.close();
 con.close();
 } catch(SQLException e) {
 // TODOAuto-generated catch block
 e.printStackTrace();
 }

    }
}

String sql2 = "insert into my_first_table values(?, ?)";
ps = con.prepareStatement(sql2);
ps.setInt(1, 73);
ps.setString(2, "测试");
ps.execute();
ps.close();

ps = con.prepareStatement(sql2);
ps.setInt(1, 74);
ps.setString(2, "测试中文");
ps.execute();
ps.close();

ps = con.prepareStatement(sql2);
ps.setInt(1, 75);
ps.setString(2, "测试中文字符");
ps.execute();
ps.close();

String sql2 = "insert into my_first_table values(?, cast(?as string))";
ps = con.prepareStatement(sql2);
ps.setInt(1, 60);
ps.setString(2, "测试中文字符");
ps.execute();
ps.close();

ps = con.prepareStatement(sql2);
ps.setInt(1, 61);
ps.setString(2, "测试中文");
ps.execute();
ps.close();

ps = con.prepareStatement(sql2);
ps.setInt(1, 62);
ps.setString(2, "测试");
ps.execute();
ps.close();