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1. Problem description

Use Impala JDBC to insert Chinese characters into the Kudu table, the inserted Chinese string is garbled, and the Chinese string is truncated.

After the previous document used sql splicing method to insert Chinese string garbled solution, this document describes the problem of inserting Chinese string garbled using jdbc's PreparedStatement method.

two。 Problem recurrence

Test environment:

CDH5.12.0Kudu1.4.0ImpalaJDBC41_2.5.35

1. Test with ImpalaJDBC code, test code

StaticString JDBC_DRIVER = "com.cloudera.impala.jdbc41.Driver"; staticString 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 (1JI 81); ps.setString (2, "testing Chinese characters"); 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 {/ / close rs, ps and con rs.close (); ps.close (); con.close ();} catch (SQLException e) {/ / TODOAuto-generated catch block e.printStackTrace ();}

two。 Insert test data into the Kudu table, such as "test", "test Chinese", "test Chinese characters"

String sql2 = "insert into my_first_table values"; ps = con.prepareStatement (sql2); ps.setInt (1,73); ps.setString (2, "Test"); ps.execute (); ps.close (); ps = con.prepareStatement (sql2); ps.setInt (1,74); ps.setString (2, "Test Chinese"); ps.execute (); ps.close (); ps = con.prepareStatement (sql2); ps.setInt (1,75) Ps.setString (2, "Test Chinese characters"); ps.execute (); ps.close ()

The query result via Hue is as follows:

All Chinese characters are garbled, some of them are garbled, and the string is truncated.

3. Solution method

Modify the insert statement in the program and convert the insert string column to the String type using the cast function

String sql2 = "insert into my_first_table values (?, cast (? as string)"; ps = con.prepareStatement (sql2); ps.setInt (1,60); ps.setString (2, "testing Chinese characters"); ps.execute (); ps.close (); ps = con.prepareStatement (sql2); ps.setInt (1,61); ps.setString (2, "testing Chinese"); ps.execute (); ps.close (); ps = con.prepareStatement (sql2) Ps.setInt (1,62); ps.setString (2, "Test"); ps.execute (); ps.close ()

Re-insert test data into Kudu after modification: "Test Chinese characters", "Test Chinese", "Test"

The query using Hue is displayed as follows:

The Kudu display of Chinese string insertion is normal.

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