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This commit is contained in:
Juergen Hoeller
2023-07-26 14:07:08 +02:00
parent 2573ba4a50
commit 333249e7b0
3 changed files with 23 additions and 39 deletions
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32
framework-docs/modules/ROOT/pages/data-access/jdbc/core.adoc
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@@ -501,8 +501,8 @@ extend from it, your sub-class inherits a `setDataSource(..)` method from the
Regardless of which of the above template initialization styles you choose to use (or
not), it is seldom necessary to create a new instance of a `JdbcTemplate` class each
time you want to run SQL. Once configured, a `JdbcTemplate` instance is thread-safe.
If your application accesses multiple
databases, you may want multiple `JdbcTemplate` instances, which requires multiple `DataSources` and, subsequently, multiple differently
If your application accesses multiple databases, you may want multiple `JdbcTemplate`
instances, which requires multiple `DataSources` and, subsequently, multiple differently
configured `JdbcTemplate` instances.
@@ -531,11 +531,8 @@ Java::
}
public int countOfActorsByFirstName(String firstName) {
String sql = "select count(*) from T_ACTOR where first_name = :first_name";
String sql = "select count(*) from t_actor where first_name = :first_name";
SqlParameterSource namedParameters = new MapSqlParameterSource("first_name", firstName);
return this.namedParameterJdbcTemplate.queryForObject(sql, namedParameters, Integer.class);
}
----
@@ -547,7 +544,7 @@ Kotlin::
private val namedParameterJdbcTemplate = NamedParameterJdbcTemplate(dataSource)
fun countOfActorsByFirstName(firstName: String): Int {
val sql = "select count(*) from T_ACTOR where first_name = :first_name"
val sql = "select count(*) from t_actor where first_name = :first_name"
val namedParameters = MapSqlParameterSource("first_name", firstName)
return namedParameterJdbcTemplate.queryForObject(sql, namedParameters, Int::class.java)!!
}
@@ -579,12 +576,9 @@ Java::
}
public int countOfActorsByFirstName(String firstName) {
String sql = "select count(*) from T_ACTOR where first_name = :first_name";
String sql = "select count(*) from t_actor where first_name = :first_name";
Map<String, String> namedParameters = Collections.singletonMap("first_name", firstName);
return this.namedParameterJdbcTemplate.queryForObject(sql, namedParameters, Integer.class);
return this.namedParameterJdbcTemplate.queryForObject(sql, namedParameters, Integer.class);
}
----
@@ -596,7 +590,7 @@ Kotlin::
private val namedParameterJdbcTemplate = NamedParameterJdbcTemplate(dataSource)
fun countOfActorsByFirstName(firstName: String): Int {
val sql = "select count(*) from T_ACTOR where first_name = :first_name"
val sql = "select count(*) from t_actor where first_name = :first_name"
val namedParameters = mapOf("first_name" to firstName)
return namedParameterJdbcTemplate.queryForObject(sql, namedParameters, Int::class.java)!!
}
@@ -644,7 +638,6 @@ Java::
}
// setters omitted...
}
----
@@ -673,12 +666,9 @@ Java::
}
public int countOfActors(Actor exampleActor) {
// notice how the named parameters match the properties of the above 'Actor' class
String sql = "select count(*) from T_ACTOR where first_name = :firstName and last_name = :lastName";
String sql = "select count(*) from t_actor where first_name = :firstName and last_name = :lastName";
SqlParameterSource namedParameters = new BeanPropertySqlParameterSource(exampleActor);
return this.namedParameterJdbcTemplate.queryForObject(sql, namedParameters, Integer.class);
}
----
@@ -694,7 +684,7 @@ Kotlin::
fun countOfActors(exampleActor: Actor): Int {
// notice how the named parameters match the properties of the above 'Actor' class
val sql = "select count(*) from T_ACTOR where first_name = :firstName and last_name = :lastName"
val sql = "select count(*) from t_actor where first_name = :firstName and last_name = :lastName"
val namedParameters = BeanPropertySqlParameterSource(exampleActor)
return namedParameterJdbcTemplate.queryForObject(sql, namedParameters, Int::class.java)!!
}
@@ -707,8 +697,8 @@ functionality that is present only in the `JdbcTemplate` class, you can use the
`getJdbcOperations()` method to access the wrapped `JdbcTemplate` through the
`JdbcOperations` interface.
See also xref:data-access/jdbc/core.adoc#jdbc-JdbcTemplate-idioms[`JdbcTemplate` Best Practices] for guidelines on using the
`NamedParameterJdbcTemplate` class in the context of an application.
See also xref:data-access/jdbc/core.adoc#jdbc-JdbcTemplate-idioms[`JdbcTemplate` Best Practices]
for guidelines on using the `NamedParameterJdbcTemplate` class in the context of an application.
[[jdbc-SQLExceptionTranslator]]