OCI Table Functions

This section describes the OCI Table functions.

Table 19-18 Table Functions

Function/Page	Purpose
OCITableDelete()	Delete element
OCITableExists()	Test whether element exists
OCITableFirst()	Return first index of table
OCITableLast()	Return last index of table
OCITableNext()	Return next available index of table
OCITablePrev()	Return previous available index of table
OCITableSize()	Return current size of table

OCITableDelete()

Purpose

Deletes the element at the specified index.

Syntax

sword OCITableDelete ( OCIEnv          *env, 
                       OCIError        *err, 
                       sb4             index, 
                       OCITable        *tbl );

Parameters

env (IN/OUT): The OCI environment handle initialized in object mode.

See Also:
OCIEnvCreate() and OCIInitialize()
err (IN/OUT): The OCI error handle. If there is an error, it is recorded in err and this function returns OCI_ERROR. Obtain diagnostic information by calling OCIErrorGet().
index (IN): Index of the element which must be deleted.
tbl (IN): Table whose element is deleted.

Comments

This function returns an error if the element at the given index has already been deleted or if the given index is not valid for the given table. It is also an error if any input parameter is NULL.

Note:

The position ordinals of the remaining elements of the table are not changed by OCITableDelete(). The delete operation creates holes in the table.

Related Functions

OCIErrorGet(), OCITableExists()

OCITableExists()

Purpose

Tests whether an element exists at the given index.

Syntax

sword OCITableExists ( OCIEnv              *env,
                       OCIError            *err, 
                       const OCITable      *tbl,
                       sb4                 index, 
                       boolean             *exists );

Parameters

env (IN/OUT): The OCI environment handle initialized in object mode.

See Also:
OCIEnvCreate() and OCIInitialize()
err (IN/OUT): The OCI error handle. If there is an error, it is recorded in err and this function returns OCI_ERROR. Obtain diagnostic information by calling OCIErrorGet().
tbl (IN): Table in which the given index is checked.
index (IN): Index of the element which is checked for existence.
exists (OUT): Set to TRUE if element at given index exists; otherwise, it is set to FALSE.

Comments

This function returns an error if any input parameter is NULL.

Related Functions

OCIErrorGet(), OCITableDelete()

OCITableFirst()

Purpose

Returns the index of the first existing element in a given table.

Syntax

sword OCITableFirst ( OCIEnv             *env, 
                      OCIError           *err,
                      const OCITable     *tbl, 
                      sb4                *index  );

Parameters

env (IN/OUT): The OCI environment handle initialized in object mode.

See Also:
OCIEnvCreate() and OCIInitialize()
err (IN/OUT): The OCI error handle. If there is an error, it is recorded in err and this function returns OCI_ERROR. Obtain diagnostic information by calling OCIErrorGet().
tbl (IN): Table to scan.
index (OUT): First index of the element which exists in the given table is returned.

Comments

For example, if OCITableDelete() deleted the first 5 elements of a table, OCITableFirst() returns 6.

OCITableLast()

Purpose

Returns the index of the last existing element of a table.

Syntax

sword OCITableLast ( OCIEnv              *env, 
                     OCIError            *err, 
                     const OCITable      *tbl, 
                     sb4                 *index );

Parameters

env (IN/OUT): The OCI environment handle initialized in object mode.

See Also:
OCIEnvCreate() and OCIInitialize()
err (IN/OUT): The OCI error handle. If there is an error, it is recorded in err and this function returns OCI_ERROR. Obtain diagnostic information by calling OCIErrorGet().
tbl (IN): Table to scan.
index (OUT): Index of the last existing element in the table.

Comments

This function returns an error if the table is empty.

Related Functions

OCIErrorGet(), OCITableFirst(), OCITableNext(), OCITablePrev()

OCITableNext()

Purpose

Returns the index of the next existing element of a table.

Syntax

sword OCITableNext ( OCIEnv             *env, 
                     OCIError           *err, 
                     sb4                index, 
                     const OCITable     *tbl, 
                     sb4                *next_index
                     boolean            *exists );

Parameters

env (IN/OUT): The OCI environment handle initialized in object mode.

See Also:
OCIEnvCreate() and OCIInitialize()
err (IN/OUT): The OCI error handle. If there is an error, it is recorded in err and this function returns OCI_ERROR. Obtain diagnostic information by calling OCIErrorGet().
index (IN): Index for starting point of scan.
tbl (IN): Table to scan.
next_index (OUT): Index of the next existing element after tbl(index).
exists (OUT): FALSE if no next index is available, else TRUE.

Comments

Returns the smallest position j, greater than index, such that exists(j) is TRUE.

OCITablePrev()

Purpose

Returns the index of the previous existing element of a table.

Syntax

sword OCITablePrev ( OCIEnv             *env, 
                     OCIError           *err, 
                     sb4                index,
                     const OCITable     *tbl,
                     sb4                *prev_index
                     boolean            *exists );

Parameters

env (IN/OUT): The OCI environment handle initialized in object mode.

See Also:
OCIEnvCreate() and OCIInitialize()
err (IN/OUT): The OCI error handle. If there is an error, it is recorded in err and this function returns OCI_ERROR. Obtain diagnostic information by calling OCIErrorGet().
index (IN): Index for starting point of scan.
tbl (IN): Table to scan.
prev_index (OUT): Index of the previous existing element before tbl(index).
exists (OUT): FALSE if no previous index is available, else TRUE.

Comments

Return the largest position j, less than index, such that exists(j) is TRUE.

OCITableSize()

Purpose

Returns the size of the given table, not including deleted elements.

Syntax

sword OCITableSize ( OCIEnv             *env,
                     OCIError           *err,
                     const OCITable     *tbl
                     sb4                *size );

Parameters

env (IN/OUT): The OCI environment handle initialized in object mode.

See Also:
OCIEnvCreate() and OCIInitialize()
err (IN/OUT): The OCI error handle. If there is an error, it is recorded in err and this function returns OCI_ERROR. Obtain diagnostic information by calling OCIErrorGet().
tbl (IN): Nested table whose number of elements is returned.
size (OUT): Current number of elements in the nested table. The count does not include deleted elements.

Comments

The count will be decremented upon deleting elements from the nested table. So this count does not include any holes created by deleting elements. To get the count not including the deleted elements, use OCICollSize().

For example:

OCITableSize(...); 
// assume 'size' returned is equal to 5
OCITableDelete(...); // delete one element
OCITableSize(...);
// 'size' returned is equal to 4

To get the count plus the count of deleted elements use OCICollSize(). Continuing the previous example:

OCICollSize(...)
// 'size' returned is still equal to 5

This function returns an error if an error occurs during the loading of the nested table into the object cache, or if any of the input parameters is NULL.

Related Functions

OCICollSize()