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><H1
><A
NAME="function.db2-statistics"
></A
>db2_statistics</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN83402"
></A
><P
> (PECL)</P
>db2_statistics --
Returns a result set listing the index and statistics for a table
</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN83405"
></A
><H2
>说明</H2
>resource <B
CLASS="methodname"
>db2_statistics</B
> ( resource connection, string qualifier, string schema, string table-name, bool unique )<BR
></BR
><P
> Returns a result set listing the index and statistics for a table.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN83426"
></A
><H2
>参数</H2
><P
> <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>connection</CODE
></DT
><DD
><P
> A valid connection to an IBM DB2, Cloudscape, or Apache Derby database.
</P
></DD
><DT
><CODE
CLASS="parameter"
>qualifier</CODE
></DT
><DD
><P
> A qualifier for DB2 databases running on OS/390 or z/OS servers. For
other databases, pass <TT
CLASS="constant"
><B
>NULL</B
></TT
> or an empty string.
</P
></DD
><DT
><CODE
CLASS="parameter"
>schema</CODE
></DT
><DD
><P
> The schema that contains the targeted table. If this parameter is
<TT
CLASS="constant"
><B
>NULL</B
></TT
>, the statistics and indexes are returned for the schema of the
current user.
</P
></DD
><DT
><CODE
CLASS="parameter"
>table_name</CODE
></DT
><DD
><P
> The name of the table.
</P
></DD
><DT
><CODE
CLASS="parameter"
>unique</CODE
></DT
><DD
><P
> An integer value representing the type of index information to return.
<P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>0</CODE
></DT
><DD
><P
> Return only the information for unique indexes on the table.
</P
></DD
><DT
><CODE
CLASS="parameter"
>1</CODE
></DT
><DD
><P
> Return the information for all indexes on the table.
</P
></DD
></DL
></DIV
>
</P
></DD
></DL
></DIV
>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN83468"
></A
><H2
>返回值</H2
><P
> Returns a statement resource with a result set containing rows describing
the statistics and indexes for the base tables matching the specified
parameters. The rows are composed of the following columns:
<DIV
CLASS="informaltable"
><P
></P
><A
NAME="AEN83471"
></A
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><THEAD
><TR
><TH
>Column name</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
>TABLE_CAT</TD
><TD
>The catalog that contains the table. The value is <TT
CLASS="constant"
><B
>NULL</B
></TT
> if
this table does not have catalogs.</TD
></TR
><TR
><TD
>TABLE_SCHEM</TD
><TD
>Name of the schema that contains the table.</TD
></TR
><TR
><TD
>TABLE_NAME</TD
><TD
>Name of the table.</TD
></TR
><TR
><TD
>NON_UNIQUE</TD
><TD
> <P
> An integer value representing whether the index prohibits unique
values, or whether the row represents statistics on the table itself:
<DIV
CLASS="informaltable"
><P
></P
><A
NAME="AEN83492"
></A
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><THEAD
><TR
><TD
>Return value</TD
><TD
>Parameter type</TD
></TR
></THEAD
><TBODY
><TR
><TD
>0 (SQL_FALSE)</TD
><TD
>The index allows duplicate values.</TD
></TR
><TR
><TD
>1 (SQL_TRUE)</TD
><TD
>The index values must be unique.</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>NULL</B
></TT
></TD
><TD
>This row is statistics information for the table itself.</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
>
</P
>
</TD
></TR
><TR
><TD
>INDEX_QUALIFIER</TD
><TD
>A string value representing the qualifier that would have to be
prepended to INDEX_NAME to fully qualify the index.</TD
></TR
><TR
><TD
>INDEX_NAME</TD
><TD
>A string representing the name of the index.</TD
></TR
><TR
><TD
>TYPE</TD
><TD
> <P
> An integer value representing the type of information contained in
this row of the result set:
<DIV
CLASS="informaltable"
><P
></P
><A
NAME="AEN83519"
></A
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><THEAD
><TR
><TD
>Return value</TD
><TD
>Parameter type</TD
></TR
></THEAD
><TBODY
><TR
><TD
>0 (SQL_TABLE_STAT)</TD
><TD
>The row contains statistics about the table itself.</TD
></TR
><TR
><TD
>1 (SQL_INDEX_CLUSTERED)</TD
><TD
>The row contains information about a clustered index.</TD
></TR
><TR
><TD
>2 (SQL_INDEX_HASH)</TD
><TD
>The row contains information about a hashed index.</TD
></TR
><TR
><TD
>3 (SQL_INDEX_OTHER)</TD
><TD
>The row contains information about a type of index that
is neither clustered nor hashed.</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
>
</P
>
</TD
></TR
><TR
><TD
>ORDINAL_POSITION</TD
><TD
>The 1-indexed position of the column in the index. <TT
CLASS="constant"
><B
>NULL</B
></TT
> if
the row contains statistics information about the table itself.</TD
></TR
><TR
><TD
>COLUMN_NAME</TD
><TD
>The name of the column in the index. <TT
CLASS="constant"
><B
>NULL</B
></TT
> if the row
contains statistics information about the table itself.</TD
></TR
><TR
><TD
>ASC_OR_DESC</TD
><TD
> <TT
CLASS="literal"
>A</TT
> if the column is sorted in ascending order,
<TT
CLASS="literal"
>D</TT
> if the column is sorted in descending order,
<TT
CLASS="constant"
><B
>NULL</B
></TT
> if the row contains statistics information about the table
itself.
</TD
></TR
><TR
><TD
>CARDINALITY</TD
><TD
> <P
> If the row contains information about an index, this column contains
an integer value representing the number of unique values in the
index.
</P
>
<P
> If the row contains information about the table itself, this column
contains an integer value representing the number of rows in the
table.
</P
>
</TD
></TR
><TR
><TD
>PAGES</TD
><TD
> <P
> If the row contains information about an index, this column contains
an integer value representing the number of pages used to store the
index.
</P
>
<P
> If the row contains information about the table itself, this column
contains an integer value representing the number of pages used to
store the table.
</P
>
</TD
></TR
><TR
><TD
>FILTER_CONDITION</TD
><TD
>Always returns <TT
CLASS="constant"
><B
>NULL</B
></TT
>.</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN83566"
></A
><H2
>参见</H2
><P
> <P
></P
><TABLE
BORDER="0"
><TBODY
><TR
><TD
><A
HREF="function.db2-column-privileges.html"
><B
CLASS="function"
>db2_column_privileges()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.db2-columns.html"
><B
CLASS="function"
>db2_columns()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.db2-foreign-keys.html"
><B
CLASS="function"
>db2_foreign_keys()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.db2-primary-keys.html"
><B
CLASS="function"
>db2_primary_keys()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.db2-procedure-columns.html"
><B
CLASS="function"
>db2_procedure_columns()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.db2-procedures.html"
><B
CLASS="function"
>db2_procedures()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.db2-special-columns.html"
><B
CLASS="function"
>db2_special_columns()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.db2-table-privileges.html"
><B
CLASS="function"
>db2_table_privileges()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.db2-tables.html"
><B
CLASS="function"
>db2_tables()</B
></A
></TD
></TR
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><P
></P
>
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