Spring grails应用程序中多次触发Datasource.groovy(第二次调用时引发异常)
创建应用程序的变通方法:Spring grails应用程序中多次触发Datasource.groovy(第二次调用时引发异常),spring,hibernate,grails,groovy,Spring,Hibernate,Grails,Groovy,创建应用程序的变通方法: 使用Postgres数据库创建Grails应用程序 需要在执行应用程序时创建数据库(即从项目本身创建数据库,而不是手动创建数据库) 为了创建数据库,我在datasource.groovy中调用groovy服务CreateDatabaseService,如下所示: import demo.grails.CreateDatabaseService CreateDatabaseService.serviceMethod() dataSource { pooled = t
import demo.grails.CreateDatabaseService
CreateDatabaseService.serviceMethod()
dataSource {
pooled = true
jmxExport = true
driverClassName = "org.postgresql.Driver"
dialect = "org.hibernate.dialect.PostgreSQLDialect"
username = "postgres"
password = "password"
}
hibernate {
cache.use_second_level_cache = true
cache.use_query_cache = false
singleSession = true // configure OSIV singleSession mode
flush.mode = 'manual'
}
// environment specific settings
environments {
development {
dataSource {
dbCreate = "create-drop"
url = "jdbc:postgresql://localhost:5432/SampleAppDb"
}
}
test {
dataSource {
dbCreate = "update"
url = "jdbc:postgresql://localhost:5432/SampleAppDb"
}
} .....
CreateDatabaseService的完整代码:
package demo.grails
import groovy.sql.Sql
import java.sql.DriverManager
import java.sql.Connection
import java.sql.SQLException
import java.sql.*
class CreateDatabaseService {
public static flag =0
def static serviceMethod() {
Connection conn = null;
Statement stmt = null;
try{
if(flag == 0) {
//STEP 2: Register JDBC driver
Class.forName("org.postgresql.Driver");
//STEP 3: Open a connection
System.out.println("Connecting to database...");
conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432", "postgres", "password");
//STEP 4: Execute a query
System.out.println("Creating database...");
stmt = conn.createStatement();
String isDatabase = "select datname from pg_catalog.pg_database where lower(datname) = lower('SampleAppDb')"
ResultSet rs = stmt.executeQuery(isDatabase);
String idr
while(rs.next()){
//Retrieve by column name
idr = rs.getString("datname");
}
if(!idr.equals("SampleAppDb")) {
String sql = "create database SampleAppDb";
stmt.executeUpdate(sql);
System.out.println("Database created successfully...");
flag =1
}
else {
flag =1
}
}
}catch(Exception e){
e.printStackTrace();
}
finally{
stmt.close();
conn.close();
}
}
}
在运行grails应用程序时,下面是完整的堆栈跟踪,它显示多次调用datasource.groovy,尽管数据库是从应用程序创建的,但在第二次调用datasource.groovy时,却抱怨没有找到合适的驱动程序
|Loading Grails 2.4.5
|Configuring classpath
.
|Environment set to development
.................................
|Packaging Grails application
................Connecting to database...
Creating database...
Database created successfully...
....................
|Running Grails application
Connecting to database...
Error |
java.sql.SQLException: No suitable driver found for jdbc:postgresql://localhost:5432
Error |
at java.sql.DriverManager.getConnection(DriverManager.java:689)
Error |
at java.sql.DriverManager.getConnection(DriverManager.java:247)
Error |
at java_sql_DriverManager$getConnection.call(Unknown Source)
Error |
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
Error |
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
Error |
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:124)
Error |
at demo.grails.CreateDatabaseService.serviceMethod(CreateDatabaseService.groovy:23)
Error |
at demo.grails.CreateDatabaseService$serviceMethod.call(Unknown Source)
Error |.......
请建议如何克服这个错误
BuildConfig.groovy
dependencies {
// specify dependencies here under either 'build', 'compile', 'runtime', 'test' or 'provided' scopes e.g.
// runtime 'mysql:mysql-connector-java:5.1.29'
// runtime 'org.postgresql:postgresql:9.3-1101-jdbc41'
runtime 'postgresql:postgresql:9.0-801.jdbc4'
test "org.grails:grails-datastore-test-support:1.0.2-grails-2.4"
}
plugins {
// plugins for the build system only
build ":tomcat:7.0.55.2" // or ":tomcat:8.0.20"
// plugins for the compile step
compile ":scaffolding:2.1.2"
compile ':cache:1.1.8'
compile ":asset-pipeline:2.1.5"
// plugins needed at runtime but not for compilation
runtime ":hibernate4:4.3.8.1" // or ":hibernate:3.6.10.18"
runtime ":database-migration:1.4.0"
runtime ":jquery:1.11.1"
// Uncomment these to enable additional asset-pipeline capabilities
//compile ":sass-asset-pipeline:1.9.0"
//compile ":less-asset-pipeline:1.10.0"
//compile ":coffee-asset-pipeline:1.8.0"
//compile ":handlebars-asset-pipeline:1.3.0.3"
}
}
验证
BuildConfig
dependencies {
...
compile 'org.grails.plugins:hibernate:4.3.10.4'
provided 'org.postgresql:postgresql:9.4-1203-jdbc4'
...
}
它运行两次可能不是问题,您的问题是缺少postgreSql驱动程序,请共享您的
BuildConfig
@shaydel添加了配置文件。顺便说一句,这不会被视为“注入”,您只是使用导入类的静态方法。注入的Springbean是一个类的实例。尝试了您的建议,但它抱怨grailsCentral中没有此类工件。