Results of 1 - 10 of about 12 for nullptr (0.007 sec.)
- Complete API – DuckDB 11390
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...cache in which to create the database, or from which to take the database. path : Path to the database file on disk. Both nullptr and :memory: open or retrieve an in-memory database. out_database : The resulting cached database. config : (Optional) con...kdb_open ( const char * path , duckdb_database * out_database ); Parameters path : Path to the database file on disk. Both nullptr and :memory: open an in-memory database. out_database : The result database object. Return Value DuckDBSuccess on success...ase * out_database , duckdb_config config , char ** out_error ); Parameters path : Path to the database file on disk. Both nullptr and :memory: open an in-memory database. out_database : The result database object. config : (Optional) configuration used... - https://man.mtool.work/duckdb/1.3/clients/c/api.html
- Appender – DuckDB 10931
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...arameters connection : The connection context to create the appender in. schema : The schema of the table to append to, or nullptr for the default schema. table : The table name to append to. out_appender : The resulting appender object. Return Value Du...ameters connection : The connection context to create the appender in. catalog : The catalog of the table to append to, or nullptr for the default catalog. schema : The schema of the table to append to, or nullptr for the default schema. table : The tab...der_error Returns the error message associated with the given appender. If the appender has no error message, this returns nullptr instead. The error message should not be freed. It will be de-allocated when duckdb_appender_destroy is called. Syntax con... - https://man.mtool.work/duckdb/1.3/clients/c/appender.html
- Startup & Shutdown – DuckDB 10931
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...using duckdb_open() . duckdb_open() takes as parameter the database file to read and write from. The special value NULL ( nullptr ) can be used to create an in-memory database . Note that for an in-memory database no data is persisted to disk (i.e., al...cache in which to create the database, or from which to take the database. path : Path to the database file on disk. Both nullptr and :memory: open or retrieve an in-memory database. out_database : The resulting cached database. config : (Optional) con...kdb_open ( const char * path , duckdb_database * out_database ); Parameters path : Path to the database file on disk. Both nullptr and :memory: open an in-memory database. out_database : The result database object. Return Value DuckDBSuccess on success... - https://man.mtool.work/duckdb/1.3/clients/c/connect.html
- Vectors – DuckDB 10718
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...validity returns a pointer to the validity mask. Note that if all values in a vector are valid, this function might return nullptr in which case the validity mask does not need to be checked. Strings String values are stored as a duckdb_string_t . This...with vectors. Example: Reading an int64 Vector with NULL Values duckdb_database db ; duckdb_connection con ; duckdb_open ( nullptr , & db ); duckdb_connect ( db , & con ); duckdb_result res ; duckdb_query ( con , "SELECT CASE WHEN i%2=0 THEN NULL ELSE i...con ); duckdb_close ( & db ); Example: Reading a String Vector duckdb_database db ; duckdb_connection con ; duckdb_open ( nullptr , & db ); duckdb_connect ( db , & con ); duckdb_result res ; duckdb_query ( con , "SELECT CASE WHEN i%2=0 THEN CONCAT('sho... - https://man.mtool.work/duckdb/1.3/clients/c/vector.html
- Values – DuckDB 9799
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...es ); Parameters type : The type of the struct values : The values for the struct fields Return Value The struct value, or nullptr, if any child type is DUCKDB_TYPE_ANY or DUCKDB_TYPE_INVALID . duckdb_create_list_value Creates a list value from a child...f the list values : The values for the list value_count : The number of values in the list Return Value The list value, or nullptr, if the child type is DUCKDB_TYPE_ANY or DUCKDB_TYPE_INVALID . duckdb_create_array_value Creates an array value from a chi...e array values : The values for the array value_count : The number of values in the array Return Value The array value, or nullptr, if the child type is DUCKDB_TYPE_ANY or DUCKDB_TYPE_INVALID . duckdb_create_map_value Creates a map value from a map type... - https://man.mtool.work/duckdb/1.3/clients/c/value.html
- Prepared Statements – DuckDB 9126
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...e error message associated with the given prepared statement. If the prepared statement has no error message, this returns nullptr instead. The error message should not be freed. It will be de-allocated when duckdb_destroy_prepare is called. Syntax cons...ent ); Parameters prepared_statement : The prepared statement to obtain the error from. Return Value The error message, or nullptr if there is none. duckdb_nparams Returns the number of parameters that can be provided to the given prepared statement. Re...Value The parameter type duckdb_param_logical_type Returns the logical type for the parameter at the given index. Returns nullptr if the parameter index is out of range or the statement was not successfully prepared. The return type of this call should... - https://man.mtool.work/duckdb/1.3/clients/c/prepared.html
- Types – DuckDB 7747
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...b_value_int8 and the value does not fit within an int8 value. In this case, a default value will be returned (usually 0 or nullptr ). The same default value will also be returned if the corresponding value is NULL . The duckdb_value_is_null function can...ate. Return Value The logical type. duckdb_logical_type_get_alias Returns the alias of a duckdb_logical_type, if set, else nullptr . The result must be destroyed with duckdb_free . Syntax char * duckdb_logical_type_get_alias ( duckdb_logical_type type )...; Parameters type : The logical type Return Value The alias or nullptr duckdb_logical_type_set_alias Sets the alias of a duckdb_logical_type. Syntax void duckdb_logical_type_set_alias ( duckdb_... - https://man.mtool.work/duckdb/1.3/clients/c/types.html
- C++ API – DuckDB 7747
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...DB instance using its constructor. DuckDB() takes as parameter the database file to read and write from. The special value nullptr can be used to create an in-memory database . Note that for an in-memory database no data is persisted to disk (i.e., all...t is therefore recommended that each thread uses its own connection if you are in a multithreaded environment. DuckDB db ( nullptr ); Connection con ( db ); Querying Connections expose the Query() method to send a SQL query string to DuckDB from C++. Qu... - https://man.mtool.work/duckdb/1.3/clients/cpp.html
- ADBC Client – DuckDB 7305
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...or ); StatementBindStream ( & adbc_statement , & arrow_stream , & adbc_error ); StatementExecuteQuery ( & adbc_statement , nullptr , nullptr , & adbc_error ); Python The first thing to do is to use pip and install the ADBC Driver manager. You will also... - https://man.mtool.work/duckdb/1.3/clients/adbc.html
- Building Extensions – DuckDB 7075
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...throughout the non-performance-critical code have extra checks to ensure memory safety, these checks include: Making sure nullptr is never dereferenced. Making sure index out of bounds accesses don't trigger a crash. With this flag enabled we remove th... - https://man.mtool.work/duckdb/1.3/dev/building/building_extensions.html
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