我想使用方解石解析sql查询来进行一些SQL等价验证。但我发现方解石的默认设置不支持方言特定的运算符,例如
TO_TIMESTAMP
。错误如下:
No match found for function signature TO_TIMESTAMP(<CHARACTER>, <CHARACTER>)
这里的answer说我可以使用jdbc来更改方解石的设置。但我找不到在哪里使用 jdbc 字符串来更改设置。我应该使用方解石中的一些API将jdbc语句放入方解石中吗?
TO_TIMESTAMP 不起作用...它会导致 java.lang.RuntimeException: 无法翻译调用 TO_TIMESTAMP($t1, $t2)
PARSE_TIMESTAMP 效果很好
import org.apache.calcite.adapter.jdbc.JdbcSchema;
import org.apache.calcite.avatica.util.Casing;
import org.apache.calcite.config.CalciteConnectionProperty;
import org.apache.calcite.jdbc.CalciteConnection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Properties;
import org.apache.calcite.jdbc.Driver;
import org.apache.calcite.schema.SchemaPlus;
import javax.sql.DataSource;
public class Test {
public static void main(String[] args) throws SQLException {
CalciteConnection connection = initCalciteConnection();
DataSource oracleDataSource1 = JdbcSchema.dataSource(
"jdbc:oracle:thin:@//<ip>:<port>/<service>",
"oracle.jdbc.OracleDriver",
"<user>",
"<password>"
);
String schemaName = "oracle_1";
SchemaPlus rootSchema = connection.getRootSchema();
JdbcSchema jdbcSchema = JdbcSchema.create(rootSchema, schemaName, oracleDataSource1, null, "<schema>");
rootSchema.add(schemaName, jdbcSchema);
// String sql = """
// SELECT PARSE_TIMESTAMP('%d.%m.%Y %H:%M:%S', '01.01.2024 00:00:00')
// """;
String sql = """
SELECT TO_TIMESTAMP('2024-01-01 00:00:00', 'YYYY-MM-DD HH24:MI:SS')
""";
ResultSet resultSet = connection.createStatement().executeQuery(sql);
while (resultSet.next()) {
for (int i=1; i <= resultSet.getMetaData().getColumnCount(); i++) {
System.out.println(resultSet.getString(i));
System.out.println(" ");
}
System.out.println(" ");
}
}
private static CalciteConnection initCalciteConnection() throws SQLException {
DriverManager.registerDriver(new Driver());
Properties properties = new Properties();
// properties.putIfAbsent(CalciteConnectionProperty.FUN.camelName(), "oracle,postgresql,bigquery");
properties.putIfAbsent(CalciteConnectionProperty.FUN.camelName(), "all");
properties.putIfAbsent(CalciteConnectionProperty.CASE_SENSITIVE.camelName(), "false");
properties.putIfAbsent(CalciteConnectionProperty.QUOTED_CASING.camelName(), Casing.UNCHANGED.name());
properties.putIfAbsent(CalciteConnectionProperty.UNQUOTED_CASING.camelName(), Casing.UNCHANGED.name());
return DriverManager.getConnection("jdbc:calcite:", properties).unwrap(CalciteConnection.class);
}
}