The value class represents a single value of any type.

API Reference

void duckdb_destroy_value(duckdb_value *value);
duckdb_value duckdb_create_varchar(const char *text);
duckdb_value duckdb_create_varchar_length(const char *text, idx_t length);
duckdb_value duckdb_create_int64(int64_t val);
duckdb_value duckdb_create_struct_value(duckdb_logical_type type, duckdb_value *values);
duckdb_value duckdb_create_list_value(duckdb_logical_type type, duckdb_value *values, idx_t value_count);
duckdb_value duckdb_create_array_value(duckdb_logical_type type, duckdb_value *values, idx_t value_count);
char *duckdb_get_varchar(duckdb_value value);
int64_t duckdb_get_int64(duckdb_value value);

duckdb_destroy_value

Destroys the value and de-allocates all memory allocated for that type.

Syntax

void duckdb_destroy_value(
  duckdb_value *value
);

Parameters

• value

The value to destroy.

duckdb_create_varchar

Creates a value from a null-terminated string

Syntax

duckdb_value duckdb_create_varchar(
  const char *text
);

Parameters

• value

The null-terminated string

• returns

The value. This must be destroyed with duckdb_destroy_value.

duckdb_create_varchar_length

Creates a value from a string

Syntax

duckdb_value duckdb_create_varchar_length(
  const char *text,
  idx_t length
);

Parameters

• value

The text

• length

The length of the text

• returns

The value. This must be destroyed with duckdb_destroy_value.

duckdb_create_int64

Creates a value from an int64

Syntax

duckdb_value duckdb_create_int64(
  int64_t val
);

Parameters

• value

The bigint value

• returns

The value. This must be destroyed with duckdb_destroy_value.

duckdb_create_struct_value

Creates a struct value from a type and an array of values

Syntax

duckdb_value duckdb_create_struct_value(
  duckdb_logical_type type,
  duckdb_value *values
);

Parameters

• type

The type of the struct

• values

The values for the struct fields

• returns

The value. This must be destroyed with duckdb_destroy_value.

duckdb_create_list_value

Creates a list value from a type and an array of values of length value_count

Syntax

duckdb_value duckdb_create_list_value(
  duckdb_logical_type type,
  duckdb_value *values,
  idx_t value_count
);

Parameters

• type

The type of the list

• values

The values for the list

• value_count

The number of values in the list

• returns

The value. This must be destroyed with duckdb_destroy_value.

duckdb_create_array_value

Creates a array value from a type and an array of values of length value_count

Syntax

duckdb_value duckdb_create_array_value(
  duckdb_logical_type type,
  duckdb_value *values,
  idx_t value_count
);

Parameters

• type

The type of the array

• values

The values for the array

• value_count

The number of values in the array

• returns

The value. This must be destroyed with duckdb_destroy_value.

duckdb_get_varchar

Obtains a string representation of the given value. The result must be destroyed with duckdb_free.

Syntax

char *duckdb_get_varchar(
  duckdb_value value
);

Parameters

• value

The value

• returns

The string value. This must be destroyed with duckdb_free.

duckdb_get_int64

Obtains an int64 of the given value.

Syntax

int64_t duckdb_get_int64(
  duckdb_value value
);

Parameters

• value

The value

• returns

The int64 value, or 0 if no conversion is possible