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CHAPTER 9 WORKING WITH DATE, TIME, AND TIMESTAMP IN JDBC
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java.sql.Timestamp: Mapping for SQL TIMESTAMP. The java.sql.Timestamp class extends the java.util.Date class. This is a thin wrapper around java.util.Date that allows the JDBC API to identify this as a SQL TIMESTAMP value. It adds the ability to hold the SQL TIMESTAMP nanos value and provides formatting and parsing operations to support the JDBC escape syntax for timestamp values. This type is a composite of a java.util.Date and a separate nanosecond value. Only integral seconds are stored in the java.util.Date component. The fractional seconds the nanos are separate. The getTime method will return only integral seconds. If a time value that includes the fractional seconds is desired, you must convert nanos to milliseconds (nanos/ 1,000,000) and add this to the getTime value. The Timestamp.equals(Object) method never returns true when passed a value of type java.util.Date because the nanos component of a date is unknown. As a result, the Timestamp.equals(Object) method is not symmetric with respect to the java.util.Date.equals(Object) method. Also, the hash code method uses the underlying java.util.Data implementation and therefore does not include nanos in its computation. Because of the differences between the Timestamp class and the java.util.Date class mentioned previously, it is recommended that you check the vendor s implementation of SQL s DATE, TIME, and TIMESTAMP data types. The inheritance relationship between Timestamp and java.util.Date really denotes implementation inheritance, not type inheritance. Each database vendor provides specific data types for supporting Date, Time, and Timestamp. To fully understand these data types and provide JDBC access to these types, you will see how to use the MySQL and Oracle databases in the examples.
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9-1. What Is the Mapping of Date-Related SQL and Java Types
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Three JDBC types are related to time: The JDBC DATE type (java.sql.Date, which extends java.util.Date) represents a date consisting of the day, month, and year. The corresponding SQL DATE type is defined in SQL-92. The JDBC TIME type (java.sql.Time, which extends java.util.Date) represents a time consisting of hours, minutes, and seconds. The corresponding SQL TIME type is defined in SQL-92. The JDBC TIMESTAMP type (java.sql.Timestamp, which extends java.util.Date) represents DATE plus TIME plus a nanosecond field. The corresponding SQL TIMESTAMP type is defined in SQL-92. The DATE type is where most mismatches occur. This is because the java.util.Date class represents both Date and Time, but SQL has the following three types to represent date and time information: A SQL DATE type that represents the date only (01/26/88) A SQL TIME type that specifies the time only (09:06:56) A SQL TIMESTAMP that represents the time value in nanoseconds Table 9-1 shows the mapping of JDBC types to Java types, which can be mapped back to JDBC types, because this is a one-to-one relationship mapping. Table 9-1. JDBC Types Mapped to Java Types
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java.sql.Date java.sql.Time java.sql.Timestamp
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CHAPTER 9 WORKING WITH DATE, TIME, AND TIMESTAMP IN JDBC
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9-2. How Do You Retrieve Date, Time, and Timestamp from a Database
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The ResultSet interface provides the necessary methods for extracting Date, Time, and Timestamp from a database. Table 9-2 lists the ResultSet.getXXX() methods for retrieving data from the Date, Time, and Timestamp types. Table 9-2. ResultSet Methods for Retrieving Date, Time, and Timestamp (According to the JDK)
Return Type
java.sql.Date
Method
getDate(int columnIndex)
Description
Retrieves the value of the designated column in the current row of this ResultSet object as a java.sql.Date object in the Java programming language. Retrieves the value of the designated column in the current row of this ResultSet object as a java.sql.Date object in the Java programming language. Retrieves the value of the designated column in the current row of this ResultSet object as a java.sql.Date object in the Java programming language. Retrieves the value of the designated column in the current row of this ResultSet object as a java.sql.Date object in the Java programming language. Retrieves the value of the designated column in the current row of this ResultSet object as a java.sql.Time object in the Java programming language. Retrieves the value of the designated column in the current row of this ResultSet object as a java.sql.Time object in the Java programming language. Retrieves the value of the designated column in the current row of this ResultSet object as a java.sql.Time object in the Java programming language. Retrieves the value of the designated column in the current row of this ResultSet object as a java.sql.Time object in the Java programming language. This method uses the given calendar to construct an appropriate millisecond value for the time if the underlying database does not store time zone information. Continued
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