11. A system for importing Entity Relationship (E-R) model data, comprising: a memory; a hardware processor-based a receiving device configured to receive an exported E-R model data file and a data schema of E-R model; a hardware processor-based dependency determining device configured to determine a dependency type of an entity in the exported E-R model data file based on the data schema, wherein the dependency type corresponds to at least one of no correlation, weak correlation, and strong correlation; and an hardware processor-based importing device configured to correspondingly import the entity in the exported E-R model data file based on the determined dependency type, wherein the importing the entity in the exported E-R model data file based on the determined dependency type includes: determine whether the imported entity with no correlation or weak correlation affects an entity recorded in a strong correlation table; responsive to the determined dependency type of the entity being at least one of weak correlation and no correlation, directly importing the entity; and responsive to the determined dependency type of the entity being strong correlation, storing the entity in a strong correlation table and deferring the importing of the entity until a minimum reference number of the strong correlation of the entity is satisfied; and responsive to the determination that the imported entity with no correlation or weak correlation affects the entity recorded in the strong correlation table, importing the entity recorded in the strong correlation table and deleting the entity recorded in the strong correlation table from the strong correlation table.
11. A system for importing Entity Relationship (E-R) model data, comprising: a memory; a hardware processor-based a receiving device configured to receive an exported E-R model data file and a data schema of E-R model; a hardware processor-based dependency determining device configured to determine a dependency type of an entity in the exported E-R model data file based on the data schema, wherein the dependency type corresponds to at least one of no correlation, weak correlation, and strong correlation; and an hardware processor-based importing device configured to correspondingly import the entity in the exported E-R model data file based on the determined dependency type, wherein the importing the entity in the exported E-R model data file based on the determined dependency type includes: determine whether the imported entity with no correlation or weak correlation affects an entity recorded in a strong correlation table; responsive to the determined dependency type of the entity being at least one of weak correlation and no correlation, directly importing the entity; and responsive to the determined dependency type of the entity being strong correlation, storing the entity in a strong correlation table and deferring the importing of the entity until a minimum reference number of the strong correlation of the entity is satisfied; and responsive to the determination that the imported entity with no correlation or weak correlation affects the entity recorded in the strong correlation table, importing the entity recorded in the strong correlation table and deleting the entity recorded in the strong correlation table from the strong correlation table. 13. The system according to claim 11 , wherein the importing device is further configured to: responsive to the determined dependency type of the entity being the weak correlation, directly import the entity; and record weak correlation reference information of the entity in a weak correlation table.