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Jincang database kingbasees client Programming Interface Guide - ODBC feature support constraints

2022-07-28 23:49:00 【Thousands of sails passed by the side of the sunken boat_】

3. ODBC Features support constraints

KingbaseES Yes ODBC 3.0 The support of is constrained , This section will describe these constraints in terms of system boundary values .

3.1.  System boundary value

surface 3.1.9  System boundary value

System features

minimum value

Maximum

ODBC Number of connections per environment handle

0

128

3.2.  Special data description

  1. BLOB

    BLOB Data types can be inserted programmatically （ reference   example   Medium " Binding parameters are BLOB value " ）, You can also call SQL sentence  insert into [table name] values(1,X'41424344')  Insert .

  2. CLOB

    And BLOB similar ,CLOB Data types can be inserted programmatically , You can also call SQL sentence  insert into [table name] values(1, 'ABCD')  Insert .

3.3.  Other constraints

  1. SQLBindCol

    The types in specific columns can be converted to C data type , See table 3.3.1.

  2. SQLBindParameter

    Support from the C The data type goes to SQL Transformation of data types , See table 3.3.2.

    The column type is the same as SQL For the corresponding relationship of statement types, see table 3.3.3.

  3. SQLGetData

    The types in specific columns can be converted to C data type , See table 3.3.1.

Refer to the following detailed data type conversion ：

3.3.1.  The column types in the table are up to C Conversion of data types

call SQLBindCol and SQLGetData You can refer to this table .

The column definitions in the table can be those listed in the first column of the following table 12 Types ,ODBC Of C The data types can be those listed in the first row of the following table 20 Types .

If the table is defined as a type on the left , So when you call SQLGetData perhaps SQLBindCol when TargeType Parameters can only be filled in the row corresponding to the data type "Y" Of C data type .

for example , When the column in the table is defined as date, So called SQLGetData perhaps SQLBindCol when ,TargetType The parameter can be SQL_C_DEFAULT,SQL_C_CHAR,SQL_C_DATE,SQL_C_TIME,SQL_C_TIMESTAMP, And can't be SQL_C_TINYINT.

surface 3.3.6  Column type to C Data type conversion table

Column definitions in the table

C data type

S Q L _C _ DE FA UL T

S Q L _C _ CH AR

S Q L _C _ TI NY IN T

S Q L _C _ UT IN YI NT

S Q L _C _ ST IN YI NT

S Q L _C _ SH OR T

S Q L _C _ US HO RT

S Q L _C _ SS HO RT

S Q L _C _ LO NG

S Q L _C _ UL ON G

S Q L _C _ SL ON G

S Q L _C _ SB IG IN T

S Q L _C _ UB IG IN T

S Q L _C _ DO UB LE

S Q L _C _ FL OA T

S Q L _C _ BI NA RY

S Q L _C _ BI T

S Q L _C _ DA TE

S Q L _C _ TI ME

S Q L _C _ TI ME ST AM P

BIGINT

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

INTEGER

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

SMALLINT

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

TINYINT

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

NUMERIC DECIMAL

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

FLOAT DOUBLE REAL

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

BIT

Y

Y

BYTEA BLOB

Y

Y

BOOL BOOLEAN

Y

Y

DATE TIME TIMESTAMP INTERVAL

Y

Y

Y

Y

Y

CHAR VARCHAR

Y

Y

Y

Y

Y

TEXT CLOB

Y

Y

3.3.2. C Data type to SQL Conversion of data types

call SQLBindParameter You can refer to this table .

ODBC Of C The data type can use the 18 Types ,SQL Statement types can use the 19 Types .

If the binding parameter ValueType For some kind of C data type , So when you call SQLBindParameter when ,ParameterType The parameter can only be this C The column corresponding to the data type is filled with "Y" Of SQL data type . Such as ：

If the binding parameter ValueType by SQL_C_CHAR, So called SQLBindParameter when ,ParameterType The parameter can be SQL_CHAR,SQL_VARCHAR,SQL_LONGVARCHAR, And can't be SQL_DECIMAL.

surface 3.3.7 C Data type to SQL Data type conversion table

Column definitions in the table

C data type

S Q L _C _ DE FA UL T

S Q L _C _ CH AR

S Q L _C _ TI NY IN T

S Q L _C _ UT IN YI NT

S Q L _C _ ST IN YI NT

S Q L _C _ SH OR T

S Q L _C _ US HO RT

S Q L _C _ SS HO RT

S Q L _C _ LO NG

S Q L _C _ UL ON G

S Q L _C _ SL ON G

S Q L _C _ DO UB LE

S Q L _C _ FL OA T

S Q L _C _ BI NA RY

S Q L _C _ BI T

S Q L _C _ DA TE

S Q L _C _ TI ME

S Q L _C _ TI ME ST AM P

SQL_CHAR

Y

Y

Y

Y

Y

SQL_VARCHAR

Y

Y

Y

Y

Y

SQL_LONGVARCHAR

Y

Y

SQL_DECIMAL

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

SQL_NUMERIC

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

SQL_BIT

Y

Y

SQL_TINYINT

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

SQL_SMALLINT

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

SQL_INTEGER

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

SQL_BIGINT

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

SQL_REAL

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

SQL_FLOAT

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

SQL_DOUBLE

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

SQL_BINARY

Y

Y

SQL_VARBINARY

Y

Y

SQL_LONGVARBINARY

Y

Y

SQL_TYPE_DATE

Y

Y

Y

Y

SQL_TYPE_TIME

Y

Y

Y

Y

SQL_TYPE_TIMESTAMP

Y

Y

Y

Y

3.3.3.  The column types in the table are up to SQL Mapping of data types

The following table lists the calls SQLBindParameter The columns in the time table define the data type and SQL Type correspondence ：

When the data type in the table is defined as a type of the first column , So when you call SQLBindParameter when ,ParameterType It can only be the value of the second column in its corresponding row . Such as ： The column type in the table is INTEGER(INT), So the corresponding SQL The data type can only be SQL_INTEGER, Not for others SQL data type , Otherwise, the data conversion will be wrong .

surface 3.3.8  The column types in the table are up to SQL Mapping table of data types

Column definitions in the table

It can be transformed into the following SQL data type

BIGINT

SQL_BIGINT

INTEGER

SQL_INTEGER

SMALLINT

SQL_SMALLINT

TINYINT

SQL_TINYINT

DECIMAL NUMERIC

SQL_DECIMAL, SQL_NUMERIC

REAL FLOAT DOUBLE

SQL_REAL, SQL_FLOAT, SQL_DOUBLE

BYTEA

SQL_BINARY, SQL_VARBINARY

BLOB

SQL_LONGVARBINARY

BOOL BOOLEAN

SQL_BIT

DATE TIME TIMESTAMP

SQL_DATE, SQL_TIME, SQL_TIMESTAMP

CHAR VARCHAR TEXT

SQL_CHAR, SQL_VARCHAR

CLOB

SQL_LONGVARCHAR

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