What are the data sources?
Data source (as the name implies, it is the source of the database)
1. Original ecological JDBC
2. Encapsulation: dbcp, c3p0, druid
3.JNDI (JNDI’s full name is Java Naming and Directory Interface. JNDI mainly provides naming and directory services for resources required by applications)
4.ODBC (operating system DBC)
5.NOSQL("Non-relational data ridis")
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