# 7.10. ODPI-C Structure dpiDataTypeInfo

This structure is used for passing data type information from ODPI-C. It is part of the structures dpiObjectAttrInfo, dpiObjectTypeInfo and dpiQueryInfo.

dpiOracleTypeNum dpiDataTypeInfo.oracleTypeNum

  Specifies the type of the data. It will be one of the values from the enumeration dpiOracleTypeNum, or 0 if the type is not supported by ODPI-C.

dpiNativeTypeNum dpiDataTypeInfo.defaultNativeTypeNum

  Specifies the default native type for the data. It will be one of the values from the enumeration dpiNativeTypeNum, or 0 if the type is not supported by ODPI-C.

uint16_t dpiDataTypeInfo.ociTypeCode

  Specifies the OCI type code for the data, which can be useful if the type is not supported by ODPI-C.

uint32_t dpiDataTypeInfo.dbSizeInBytes

  Specifies the size in bytes (from the database’s perspective) of the data. This value is only populated for strings and binary data. For all other data the value is zero.

uint32_t dpiDataTypeInfo.clientSizeInBytes

  Specifies the size in bytes (from the client’s perspective) of the data. This value is only populated for strings and binary data. For all other data the value is zero.

uint32_t dpiDataTypeInfo.sizeInChars

  Specifies the size in characters of the data. This value is only populated for string data. For all other data the value is zero.

int16_t dpiDataTypeInfo.precision

  Specifies the precision of the data. This value is only populated for numeric and interval data. For all other data the value is zero.

int8_t dpiDataTypeInfo.scale

  Specifies the scale of the data. This value is only populated for numeric data. For all other data the value is zero.

uint8_t dpiDataTypeInfo.fsPrecision

  Specifies the fractional seconds precision of the data. This value is only populated for timestamp and interval day to second data. For all other data the value is zero.

dpiObjectType *dpiDataTypeInfo.objectType

  Specifies a reference to the type of the object. This value is only populated for named type data. For all other data the value is NULL. This reference is owned by the object attribute, object type or statement and a call to `dpiObjectType_addRef()` must be made if the reference is going to be used beyond the lifetime of the owning object.

int dpiDataTypeInfo.isJson

  Specifies if the data contains JSON. This is set to true when columns are fetched that are of type `DPI_ORACLE_TYPE_JSON` or if the column fetched has the check constraint “IS JSON” enabled.

const char *dpiDataTypeInfo.domainSchema

  Specifies the schema of the SQL domain associated with the column which is being queried, as a byte string in the encoding used for CHAR data.

uint32_t dpiDataTypeInfo.domainSchemaLength

  Specifies the length of the `dpiDataTypeInfo.domainSchema` member, in bytes.

const char *dpiDataTypeInfo.domainName

  Specifies the name of the SQL domain associated with the column which is being queried, as a byte string in the encoding used for CHAR data.

uint32_t dpiDataTypeInfo.domainNameLength

  Specifies the length of the `dpiDataTypeInfo.domainName` member, in bytes.

uint32_t dpiDataTypeInfo.numAnnotations

  Specifies the number of annotations associated with the column which is being fetched. It is the length of `dpiDataTypeInfo.annotations`.

dpiAnnotation *dpiDataTypeInfo.annotations

  Specifies an array of structures of type dpiAnnotation. The length of the array is specified in the `dpiDataTypeInfo.numAnnotations` member.

int dpiDataTypeInfo.isOson

  Specifies if the data contains binary encoded OSON. This is set to true when columns are fetched that have the check constraint “IS JSON FORMAT OSON” enabled.

uint32_t dpiDataTypeInfo.vectorDimensions

  Specifies the number of dimensions that a vector column contains. This value will be 0 if `oracleTypeNum` is not DPI_ORACLE_TYPE_VECTOR or the vector columns uses a flexible number of dimensions.

uint8_t dpiDataTypeInfo.vectorFormat

  Specifies the storage format of the vector column. This value will be 0 if `oracleTypeNum` is not DPI_ORACLE_TYPE_VECTOR or the vector column uses a flexible storage format. If a value is set it will be one of the values in the eneumeration dpiVectorFormat.

uint8_t dpiDataTypeInfo.vectorFlags

  Specifies flags for the vector column. This value will be 0 if `oracleTypeNum` is not DPI_ORACLE_TYPE_VECTOR or no flags have been set. If flags have been set, they will be one or more of the values in the enumeration dpiVectorFlags, or’ed together.