Cannot use setArray JDBC (integer) with H2 Database

问题

I want to put an array of integers in my jdbc query with H2 database.

Integer[] list = new Integer[]{1,2,3};
            String query = "SELECT EXAMPLE FROM DATA WHERE EXAMPLE IN (?)";
            PreparedStatement ps = GestionBDD.getConexionBD().prepareStatement(query);
            Array array = GestionBDD.getConexionBD().createArrayOf("int", list);

            ps.setArray(1, array);

            ResultSet rs = ps.executeQuery();

            while (rs.next()) {
                // DO THINGS 
            }

But doest not work, I am getting this exception : org.h2.jdbc.JdbcSQLException: Data conversion error converting "(1,2,3)"; SQL statement:

I am using H2 database. Can you help me please?

回答1:

Working with JDBC IN array parameter is hard. It is more harder if you want your query works across all DBMS. That was why I created JDBC utilities to work with JDBC IN array parameters easier.

1. If Maven, add the below dependency into your pom.xml

    <dependency>
      <groupId>com.appslandia</groupId>
      <artifactId>appslandia-common</artifactId>
      <version>6.8</version>
    </dependency>

2. If no maven, download this jar file

3. Fix your code ( Works all DBMS guaranteed )

static final Sql EXAMPLE_SQL 
          = new Sql("SELECT EXAMPLE FROM DATA WHERE EXAMPLE IN (@example_array)");

StatementImpl stat = new StatementImpl(GestionBDD.getConexionBD(), EXAMPLE_SQL);

stat.setIntArray("example_array", new int[] {1, 2, 3} );
// OR stat.setIntArray("example_array", 1, 2, 3);

ResultSet rs = stat.executeQuery();

while (rs.next()) {
    // DO THINGS 
}

rs.close(); stat.close();

4. Non IN array parameters

final Sql sampleSql 
       = new Sql("SELECT * FROM Table WHERE a=@int_a AND b=@str_b)

StatementImpl stat = new StatementImpl(conn, sampleSql);

stat.setInt("int_a", int_value);
stat.setString("str_b", not_null_string_value);
stat.setString2("str_b", null_or_string_value);
// setLong, setFloat, setDouble, setDate, ...

5. Some Notes

Parameter name supported. No more ? in your query
Parameter in Sql need to start with @ (Like Ado.NET)
IN Array parameter in Sql must be in this syntax IN (@param_name)

来源：https://stackoverflow.com/questions/56135349/cannot-use-setarray-jdbc-integer-with-h2-database

标签

java

arrays

jdbc