JET_TABLECREATE Structure

Artikkel
08/26/2021

Applies to: Windows | Windows Server

JET_TABLECREATE Structure

The JET_TABLECREATE structure contains the information that is necessary to create a table populated with columns and indexes in an ESE database. The JET_TABLECREATE structure is used by JetCreateTableColumnIndex

    typedef struct tagJET_TABLECREATE {
      unsigned long cbStruct;
      tchar* szTableName;
      tchar* szTemplateTableName;
      unsigned long ulPages;
      unsigned long ulDensity;
      JET_COLUMNCREATE* rgcolumncreate;
      unsigned long cColumns;
      JET_INDEXCREATE* rgindexcreate;
      unsigned long cIndexes;
      JET_GRBIT grbit;
      JET_TABLEID tableid;
      unsigned long cCreated;
    } JET_TABLECREATE;

Members

cbStruct

The size of this structure in bytes (for future expansion). It must be set to sizeof( JET_TABLECREATE ) in bytes.

szTableName

The name of the table to create.

The name must use meet the following conditions:

Have a value less than JET_cbNameMost, not including the terminating NULL.

Consist of the following set of characters: 0 through 9, A through Z, a through z, and all other punctuation except for exclamation point (!), comma (,), opening bracket ([), and closing bracket (]), that is, ASCII characters 0x20, 0x22 through 0x2d, 0x2f through 0x5a, 0x5c, and 0x5d through 0x7f.

Not begin with a space.

Consist of at least one non-space character.

szTemplateTableName

The name of an already-existing table from which to inherit base DDL (Data Definition Language). Use of a template table allows for the easy creation of many tables with identical columns and indexes.

ulPages

The initial number of database pages to allocate for the table. Specifying a number larger than one can reduce fragmentation if many rows are inserted into this table.

ulDensity

The table density, in percentage points. The number must be either 0 or in the range of 20 through 100. Passing 0 means that the default value should be used. The default is 80.

rgcolumncreate

An array of JET_COLUMNCREATE structures, each of which corresponds to a column to be created in the new table.

cColumns

The number of JET_COLUMNCREATE elements in rgcolumncreate.

rgindexcreate

An array of JET_INDEXCREATE structures, each of which corresponds to an index to be created in the new table.

cIndexes

The number of JET_INDEXCREATE elements in rgindexcreate.

grbit

A group of bits that contain the options for this call, which include zero or more of the following values.

Value	Meaning
JET_bitTableCreateFixedDDL	Setting JET_bitTableCreateFixedDDL prevents DDL operations on the table (such as adding or removing columns).
JET_bitTableCreateTemplateTable	Setting JET_bitTableCreateTemplateTable causes the table to be a template table. New tables can then specify the name of this table as their template table. Setting JET_bitTableCreateTemplateTable implies JET_bitTableCreateFixedDDL.
JET_bitTableCreateNoFixedVarColumnsInDerivedTables	Deprecated. Do not use.

tableid

An output field that holds the JET_TABLEID of the new table if the API call succeeds. If the API call fails, the value is undefined.

cCreated

An output field that contains the count of objects created if the API call succeeds. If the API call fails, the value is undefined.

The count of objects that are created is equal to the sum of columns, tables, and indexes that are successfully created.

Requirements

Requirement	Value
Client	Requires Windows Vista, Windows XP, or Windows 2000 Professional.
Server	Requires Windows Server 2008, Windows Server 2003, or Windows 2000 Server.
Header	Declared in Esent.h.
Unicode	Implemented as JET_TABLECREATE_W (Unicode) and JET_TABLECREATE_A (ANSI).

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JET_TABLECREATE Structure