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- C++ API 11228
- Installation To use the DuckDB C++ API, download the libduckdb archive for your platform. The latest stable version of the DuckDB C++ API is 2.0.0. Warning DuckDB's C++ API is internal. It is not guaranteed to be stable and can change witho
...le for the C++ API is duckdb.hpp . Startup & Shutdown To use DuckDB, you must first initialize a DuckDB 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...tabase no data is persisted to disk (i.e., all data is lost when you exit the process). The second parameter to the DuckDB constructor is an optional DBConfig object. In DBConfig , you can set various database parameters, for example the read/write mode or...memory limits. The DuckDB constructor may throw exceptions, for example if the database file is not usable. With the DuckDB instance, you can create one or many... - https://man.mtool.work/duckdb/2.0/clients/cpp.html
- Expression API 7485
- The Expression class represents an instance of an expression . Why Would I Use the Expression API? Use expressions to build filters and computed columns in Python. They are useful when column names or conditions depend on your code. import
...a" > 1) AND "b") The duckdb module has a short helper for each kind of expression, and this page uses them throughout. The constructors of the earlier expression API still work and build the same expressions, but new code should use the helpers: Helper Olde...r constructor col(name) ColumnExpression(name) lit(value) ConstantExpression(value) when(condition).then(value) CaseExpression(condition...list holds column names. To leave out a column of one side of a join, such as b of t , give it by its parts with the older constructor, as in StarExpression(exclude=[col("t", "b")]) ; star() takes plain names only. import duckdb import pandas as pd df = pd.... - https://man.mtool.work/duckdb/2.0/clients/python/expression.html
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