Results of 1 - 10 of about 26 for prepare (0.003 sec.)
- Prepared Statements 14580
- A prepared statement is a parameterized query. The query is prepared with question marks ( ? ) or dollar symbols ( $1 ) indicating the parameters of the query. Values can then be bound to these parameters, after which the prepared statement
...can be executed using those parameters. A single query can be prepared once and executed many times. Prepared statements are useful to: Easily supply parameters to functions while avoiding str...ion/SQL injection attacks. Speeding up queries that will be executed many times with different parameters. DuckDB supports prepared statements in the C API with the duckdb_prepare method. The duckdb_bind family of functions is used to supply values for...subsequent execution of the prepared statement using duckdb_execute_prepared . After we are done with the prepared statement it can be cleaned up using the du... - https://man.mtool.work/duckdb/2.0/clients/c/prepared.html
- PREPARE, EXECUTE, and DEALLOCATE Statements 12183
- The PREPARE statement creates a prepared statement for later execution. The EXECUTE statement runs it with optional arguments. The DEALLOCATE statement removes it. For details about auto-incremented, positional, and named parameters, see Prepare
...epared Statements . PREPARE Prepare a statement named query_person : PREPARE query_person AS SELECT * FROM person WHERE starts_with(name, $name_start)...AND age >= $minimum_age; Syntax EXECUTE Execute a prepared statement with named arguments: EXECUTE query_person(name_start := 'B', minimum_age := 40); Execute a prepared statement...with positional arguments: EXECUTE add_values(20, 22); Syntax DEALLOCATE Remove a prepared statement: DEALLOCATE query_person; The optional PREPARE keyword is accepted for PostgreSQL compatibility: DEALLOCATE PRE... - https://man.mtool.work/duckdb/2.0/sql/statements/prepare.html
- Prepared Statements 9439
- DuckDB supports prepared statements where parameters are substituted when the query is executed. This can improve readability and is useful for preventing SQL injections . Syntax There are three syntaxes for denoting parameters in prepared
...ote that not all clients support all of these syntaxes, e.g., the JDBC client only supports auto-incremented parameters in prepared statements. Example Dataset In the following, we introduce the three different syntaxes and illustrate them with examples...re at least 40 years old. This will return a single row <'Bob', 41> . Auto-Incremented Parameters: ? DuckDB supports using prepared statements with auto-incremented indexing, i.e., the position of the parameters in the query corresponds to their positio...n in the execution statement. For example: PREPARE query_person AS SELECT * FROM person WHERE starts_with(name, ?) AND age >= ?; Using the CLI client, the statement is execu... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/prepared_statements.html
- Complete API 9141
- This page contains the reference for DuckDB's C API. The reference contains several deprecation notices. These concern methods whose long-term availability is not guaranteed as they may be removed in the future. That said, DuckDB's develope
..._double_to_decimal ( double val , uint8_t width , uint8_t scale ); double duckdb_decimal_to_double ( duckdb_decimal val ); Prepared Statements duckdb_state duckdb_prepare ( duckdb_connection connection , const char * query , duckdb_prepared_statement *...out_prepared_statement ); void duckdb_destroy_prepare ( duckdb_prepared_statement * prepared_statement ); const char * duckdb_prepare_...error ( duckdb_prepared_statement prepared_statement ); idx_t duckdb_nparams ( duckdb_prepared_statement prepared_statement ); const char * duckd... - https://man.mtool.work/duckdb/2.0/clients/c/api.html
- Run Queries 8844
- Overview A Connection runs SQL through two families of methods: The execute_* methods ( execute() and execute_batch() ) send statements that do not return rows, such as INSERT or DDL, and report the number of affected rows. The query_* meth
...) , query_map() , and query_row() ) run statements that return rows and hand each Row back to be mapped into a Rust value. Prepared statements work with both. The sections below walk through sending statements, binding parameters, and turning rows into...pes. Option<T> maps to and from SQL NULL , so None binds as NULL and a NULL result reads back as None . Warning Do not use prepared statements to insert large amounts of data into DuckDB. See Import Data for the Appender and other faster options. Prepar...ed Statements Connection::prepare() compiles a statement once so it can be executed repeatedly. The returned Statement can be executed with execute() , or q... - https://man.mtool.work/duckdb/2.0/clients/rust/querying.html
- Handle Results 8794
- Overview Beyond reading a result set row by row , the Rust client can hand a query result to Apache Arrow as a stream of record batches, register an Arrow batch as a queryable table, and return results as Polars data frames. Each of these c
...ion alignment is required: reach the Arrow types through duckdb::arrow . Reading a Result as Arrow Call query_arrow() on a prepared statement to get an iterator of RecordBatch . Collecting it materializes the whole result, while iterating it reads one b...RecordBatch; use duckdb::arrow::util::pretty::print_batches; let conn = Connection::open_in_memory()?; let mut stmt = conn.prepare("SELECT * FROM generate_series(1, 5)")?; let batches: Vec<RecordBatch> = stmt.query_arrow([])?.collect(); print_batches(&b...ily, fetching chunks only as the iterator advances, use stream_arrow() , which is otherwise identical: let mut stmt = conn.prepare("SELECT * FROM big_table")?; for batch in stmt.stream_arrow([])? { // process one RecordBatch at a time println!("{} rows"... - https://man.mtool.work/duckdb/2.0/clients/rust/result_handling.html
- Reference 8678
- This page lists the functions, settings, and log types exposed by the quack extension . For a tour of the protocol, start with the Overview . Function Reference Server Management Function Description quack_serve(⟨listen_uri⟩, ...) Start a s
...2 (32 MiB) Target in-memory size of one batch (one wire message payload). Batches are cut when they reach this size. quack_prepare_inline_rows UBIGINT 24576 Rows returned inline in the PREPARE response before the remainder is left to FETCH . Drains whol...ULL http://localhost:9494 41 CONNECTION_RESPONSE NULL 60 CONNECTION 2 18 18 NULL 2026-05-10 09:06:19.842407+02 Quack DEBUG PREPARE_REQUEST 091A003553E7E67B615B73D6BE81FD2E 18 SELECT 42 http://localhost:9494 0 PREPARE_RESPONSE NULL Fields on each entry:...Field Description message_type Request type: PREPARE_REQUEST , FETCH_REQUEST , etc. quack_connection_id Server-issued connection id (stable across requests in one ATTACH ). cl... - https://man.mtool.work/duckdb/2.0/quack/reference.html
- C++ API 8497
- 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
...alue(col_idx, row_idx).ToString(); cout << (col_idx + 1 < result->ColumnCount() ? "\t" : "\n"); } } } DuckDB also supports prepared statements in the C++ API with the Prepare() method. This returns an instance of PreparedStatement . This instance can be...used to execute the prepared statement with parameters. Below is an example: std::unique_ptr<PreparedStatement> prepare = con.Prepare("SELECT count(*)...FROM a WHERE i = $1"); std::unique_ptr<QueryResult> result = prepare->Execute(12); Warning Do not use prepared statements to insert large amounts of data into DuckDB. See the data import docu... - https://man.mtool.work/duckdb/2.0/clients/cpp.html
- Node.js Client (Neo) 7968
- Installation To use the DuckDB Node.js client, visit the Node.js installation page . The latest stable version of the DuckDB Node.js (Neo) client is 2.0.0. An API for using DuckDB in Node.js . The primary package, @duckdb/node-api , is a hi
...multiple statements and access each statement's result individually, use extractStatements instead. Parameterize SQL const prepared = await connection.prepare('select $1, $2, $3'); prepared.bindVarchar(1, 'duck'); prepared.bindInteger(2, 42); prepared.b...indList(3, listValue([10, 11, 12]), LIST(INTEGER)); const result = await prepared.run(); or: const prepared = await connection.prepare('select $a, $b, $c'); prepared.bind({ 'a': 'duck', 'b': 42, 'c': lis...tValue([10, 11, 12]), }, { 'a': VARCHAR, 'b': INTEGER, 'c': LIST(INTEGER), }); const result = await prepared.run(); or even: const result = await connection.run('select $a, $b, $c', { 'a': 'duck', 'b': 42, 'c': listValue([10, 11,... - https://man.mtool.work/duckdb/2.0/clients/node_neo/overview.html
- PHP Client (PDO) 7918
- The PHP DuckDB PDO extension is a tertiary client and is maintained by a third-party. To use pdo_duckdb , follow the instructions below . The latest version of pdo_duckdb supports DuckDB 2.0.0. pdo_duckdb is a native DuckDB database driver
...y:'); $duckDb->exec('CREATE TABLE table1 (id INTEGER, amount DECIMAL(10, 2), description VARCHAR)'); $statement = $duckDb->prepare('INSERT INTO table1 VALUES (?, ?, ?)'); $statement->execute([1, 42.21, 'Hello DuckDB! ? ? ?']); $statement = $duckDb->quer...emory:'); $db->exec('CREATE TABLE table1 (id INTEGER, text VARCHAR USING COMPRESSION zstd, data JSON)'); $statement = $db->prepare('INSERT INTO table1 VALUES (?, ?, ?)'); $statement->execute([1, 'Hello DuckDB ?', ['foo' => 'bar', 'baz' => 42]]); $db->ex...b::memory:'); $db->exec('CREATE TABLE table1 (s STRUCT(v VARCHAR, i INTEGER, a VARCHAR[], d DECIMAL))'); $statement = $db->prepare('INSERT INTO table1 VALUES (?)'); $statement->execute([['v' => 'foo', 'i' => 21, 'a' => ['b', 'c'], 'd' => 42.21]]); $stat... - https://man.mtool.work/duckdb/2.0/clients/tertiary_clients/php_pdo.html
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